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CVE-2010-2836 (GCVE-0-2010-2836)
Vulnerability from cvelistv5
- n/a
| URL | Tags | ||
|---|---|---|---|
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Advisory\"]},{\"url\":\"http://www.cisco.com/en/US/products/products_security_advisory09186a0080b4a312.shtml\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Vendor Advisory\"]}]}}"
}
}
CERTA-2010-AVI-456
Vulnerability from certfr_avis
Plusieurs vulnérabilités sont présentes dans Cisco IOS. Toutes ces vulnérabilités permettent à un utilisateur distant malintentionné de provoquer un déni de service.
Description
Plusieurs vulnérabilités sont présentes dans le système d'exploitation Cisco IOS utilisé sur les équipements Cisco (eg. routeurs, commutateurs, etc.). Elles sont relatives à la mise en œuvre :
- de la translation d'adresse (NAT) ;
- du protocole SIP ;
- des VPN de type SSL ;
- du protocole H323 ;
- du protocole IGMP.
Toutes ces failles permettent à un utilisateur malintentionné de provoquer un déni de service à distance si une ou plusieurs de ces fonctionnalités sont activées sur l'équipement vulnérable.
Solution
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Les équiepement utilisant Cisco IOS comme système d'exploitation.
| Vendor | Product | Description |
|---|
| Title | Publication Time | Tags | |
|---|---|---|---|
|
|
|||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [],
"affected_systems_content": "\u003cP\u003eLes \u00e9quiepement utilisant Cisco IOS comme syst\u00e8me d\u0027exploitation.\u003c/P\u003e",
"content": "## Description\n\nPlusieurs vuln\u00e9rabilit\u00e9s sont pr\u00e9sentes dans le syst\u00e8me d\u0027exploitation\nCisco IOS utilis\u00e9 sur les \u00e9quipements Cisco (eg. routeurs, commutateurs,\netc.). Elles sont relatives \u00e0 la mise en \u0153uvre :\n\n- de la translation d\u0027adresse (NAT) ;\n- du protocole SIP ;\n- des VPN de type SSL ;\n- du protocole H323 ;\n- du protocole IGMP.\n\nToutes ces failles permettent \u00e0 un utilisateur malintentionn\u00e9 de\nprovoquer un d\u00e9ni de service \u00e0 distance si une ou plusieurs de ces\nfonctionnalit\u00e9s sont activ\u00e9es sur l\u0027\u00e9quipement vuln\u00e9rable.\n\n## Solution\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des\ncorrectifs (cf. section Documentation).\n",
"cves": [
{
"name": "CVE-2010-2835",
"url": "https://www.cve.org/CVERecord?id=CVE-2010-2835"
},
{
"name": "CVE-2010-2831",
"url": "https://www.cve.org/CVERecord?id=CVE-2010-2831"
},
{
"name": "CVE-2010-2828",
"url": "https://www.cve.org/CVERecord?id=CVE-2010-2828"
},
{
"name": "CVE-2010-2829",
"url": "https://www.cve.org/CVERecord?id=CVE-2010-2829"
},
{
"name": "CVE-2010-2836",
"url": "https://www.cve.org/CVERecord?id=CVE-2010-2836"
},
{
"name": "CVE-2010-2830",
"url": "https://www.cve.org/CVERecord?id=CVE-2010-2830"
},
{
"name": "CVE-2009-2051",
"url": "https://www.cve.org/CVERecord?id=CVE-2009-2051"
},
{
"name": "CVE-2010-2834",
"url": "https://www.cve.org/CVERecord?id=CVE-2010-2834"
}
],
"initial_release_date": "2010-09-24T00:00:00",
"last_revision_date": "2010-09-24T00:00:00",
"links": [
{
"title": "Bulletin de s\u00e9curit\u00e9 Cisco 20100922-h323 du 22 septembre 2010 :",
"url": "http://www.cisco.com/warp/public/707/cisco-sa-20100922-h323.shtml"
},
{
"title": "Bulletin de s\u00e9curit\u00e9 Cisco 20100922-igmp du 22 septembre 2010 :",
"url": "http://www.cisco.com/warp/public/707/cisco-sa-20100922-igmp.shtml"
},
{
"title": "Bulletin de s\u00e9curit\u00e9 Cisco 20100922-sslvpn du 22 septembre 2010 :",
"url": "http://www.cisco.com/warp/public/707/cisco-sa-20100922-sslvpn.shtml"
},
{
"title": "Bulletin de s\u00e9curit\u00e9 Cisco 20100922-nat du 22 septembre 2010 :",
"url": "http://www.cisco.com/warp/public/707/cisco-sa-20100922-nat.shtml"
},
{
"title": "Bulletin de s\u00e9curit\u00e9 Cisco 20100922-sip du 22 septembre 2010 :",
"url": "http://www.cisco.com/warp/public/707/cisco-sa-20100922-sip.shtml"
}
],
"reference": "CERTA-2010-AVI-456",
"revisions": [
{
"description": "version initiale.",
"revision_date": "2010-09-24T00:00:00.000000"
}
],
"risks": [
{
"description": "D\u00e9ni de service \u00e0 distance"
}
],
"summary": "Plusieurs vuln\u00e9rabilit\u00e9s sont pr\u00e9sentes dans Cisco IOS. Toutes ces\nvuln\u00e9rabilit\u00e9s permettent \u00e0 un utilisateur distant malintentionn\u00e9 de\nprovoquer un d\u00e9ni de service.\n",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans Cisco IOS",
"vendor_advisories": [
{
"published_at": null,
"title": "Bulletins de s\u00e9curit\u00e9s Cisco du 22 septembre 2010",
"url": null
}
]
}
gsd-2010-2836
Vulnerability from gsd
{
"GSD": {
"alias": "CVE-2010-2836",
"description": "Memory leak in the SSL VPN feature in Cisco IOS 12.4, 15.0, and 15.1, when HTTP port redirection is enabled, allows remote attackers to cause a denial of service (memory consumption) by improperly disconnecting SSL sessions, leading to connections that remain in the CLOSE-WAIT state, aka Bug ID CSCtg21685.",
"id": "GSD-2010-2836"
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"aliases": [
"CVE-2010-2836"
],
"details": "Memory leak in the SSL VPN feature in Cisco IOS 12.4, 15.0, and 15.1, when HTTP port redirection is enabled, allows remote attackers to cause a denial of service (memory consumption) by improperly disconnecting SSL sessions, leading to connections that remain in the CLOSE-WAIT state, aka Bug ID CSCtg21685.",
"id": "GSD-2010-2836",
"modified": "2023-12-13T01:21:31.692261Z",
"schema_version": "1.4.0"
}
},
"namespaces": {
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"CVE_data_meta": {
"ASSIGNER": "psirt@cisco.com",
"ID": "CVE-2010-2836",
"STATE": "PUBLIC"
},
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{
"product": {
"product_data": [
{
"product_name": "n/a",
"version": {
"version_data": [
{
"version_value": "n/a"
}
]
}
}
]
},
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}
]
}
},
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
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{
"lang": "eng",
"value": "Memory leak in the SSL VPN feature in Cisco IOS 12.4, 15.0, and 15.1, when HTTP port redirection is enabled, allows remote attackers to cause a denial of service (memory consumption) by improperly disconnecting SSL sessions, leading to connections that remain in the CLOSE-WAIT state, aka Bug ID CSCtg21685."
}
]
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "n/a"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "20100922 Cisco IOS SSL VPN Vulnerability",
"refsource": "CISCO",
"url": "http://www.cisco.com/en/US/products/products_security_advisory09186a0080b4a312.shtml"
}
]
}
},
"nvd.nist.gov": {
"configurations": {
"CVE_data_version": "4.0",
"nodes": [
{
"children": [],
"cpe_match": [
{
"cpe23Uri": "cpe:2.3:o:cisco:ios:12.4mr:*:*:*:*:*:*:*",
"cpe_name": [],
"vulnerable": true
},
{
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"cpe_name": [],
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},
{
"cpe23Uri": "cpe:2.3:o:cisco:ios:12.4gc:*:*:*:*:*:*:*",
"cpe_name": [],
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},
{
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},
{
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},
{
"cpe23Uri": "cpe:2.3:o:cisco:ios:12.4xn:*:*:*:*:*:*:*",
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},
{
"cpe23Uri": "cpe:2.3:o:cisco:ios:12.4xp:*:*:*:*:*:*:*",
"cpe_name": [],
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},
{
"cpe23Uri": "cpe:2.3:o:cisco:ios:12.4xt:*:*:*:*:*:*:*",
"cpe_name": [],
"vulnerable": true
},
{
"cpe23Uri": "cpe:2.3:o:cisco:ios:12.4sw:*:*:*:*:*:*:*",
"cpe_name": [],
"vulnerable": true
},
{
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"cpe_name": [],
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},
{
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"cpe_name": [],
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},
{
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"cpe_name": [],
"vulnerable": true
},
{
"cpe23Uri": "cpe:2.3:o:cisco:ios:12.4xw:*:*:*:*:*:*:*",
"cpe_name": [],
"vulnerable": true
},
{
"cpe23Uri": "cpe:2.3:o:cisco:ios:12.4xz:*:*:*:*:*:*:*",
"cpe_name": [],
"vulnerable": true
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{
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},
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"data_version": "4.0",
"description": {
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}
]
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"problemtype": {
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}
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"vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:C",
"version": "2.0"
},
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}
},
"lastModifiedDate": "2010-09-24T18:12Z",
"publishedDate": "2010-09-23T19:00Z"
}
}
}
ghsa-7m26-wxj8-3cqr
Vulnerability from github
Memory leak in the SSL VPN feature in Cisco IOS 12.4, 15.0, and 15.1, when HTTP port redirection is enabled, allows remote attackers to cause a denial of service (memory consumption) by improperly disconnecting SSL sessions, leading to connections that remain in the CLOSE-WAIT state, aka Bug ID CSCtg21685.
{
"affected": [],
"aliases": [
"CVE-2010-2836"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2010-09-23T19:00:00Z",
"severity": "HIGH"
},
"details": "Memory leak in the SSL VPN feature in Cisco IOS 12.4, 15.0, and 15.1, when HTTP port redirection is enabled, allows remote attackers to cause a denial of service (memory consumption) by improperly disconnecting SSL sessions, leading to connections that remain in the CLOSE-WAIT state, aka Bug ID CSCtg21685.",
"id": "GHSA-7m26-wxj8-3cqr",
"modified": "2022-05-17T05:48:05Z",
"published": "2022-05-17T05:48:05Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2010-2836"
},
{
"type": "WEB",
"url": "http://www.cisco.com/en/US/products/products_security_advisory09186a0080b4a312.shtml"
}
],
"schema_version": "1.4.0",
"severity": []
}
fkie_cve-2010-2836
Vulnerability from fkie_nvd
| Vendor | Product | Version | |
|---|---|---|---|
| cisco | ios | 12.4 | |
| cisco | ios | 12.4gc | |
| cisco | ios | 12.4mda | |
| cisco | ios | 12.4mr | |
| cisco | ios | 12.4mra | |
| cisco | ios | 12.4sw | |
| cisco | ios | 12.4xa | |
| cisco | ios | 12.4xb | |
| cisco | ios | 12.4xc | |
| cisco | ios | 12.4xd | |
| cisco | ios | 12.4xe | |
| cisco | ios | 12.4xf | |
| cisco | ios | 12.4xg | |
| cisco | ios | 12.4xj | |
| cisco | ios | 12.4xk | |
| cisco | ios | 12.4xl | |
| cisco | ios | 12.4xm | |
| cisco | ios | 12.4xn | |
| cisco | ios | 12.4xp | |
| cisco | ios | 12.4xt | |
| cisco | ios | 12.4xv | |
| cisco | ios | 12.4xw | |
| cisco | ios | 12.4xy | |
| cisco | ios | 12.4xz | |
| cisco | ios | 12.4ya | |
| cisco | ios | 12.4yb | |
| cisco | ios | 12.4yd | |
| cisco | ios | 15.0m | |
| cisco | ios | 15.0xa | |
| cisco | ios | 15.1\(1\)xb1 | |
| cisco | ios | 15.1t |
{
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"cveTags": [],
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"lang": "en",
"value": "Memory leak in the SSL VPN feature in Cisco IOS 12.4, 15.0, and 15.1, when HTTP port redirection is enabled, allows remote attackers to cause a denial of service (memory consumption) by improperly disconnecting SSL sessions, leading to connections that remain in the CLOSE-WAIT state, aka Bug ID CSCtg21685."
},
{
"lang": "es",
"value": "Fuga de memoria en la funcionalidad SSL VPN en Cisco IOS v12.4, v15.0, y v15.1, cuando HTTP port redirection est\u00e1 habilitado, permite a atacantes remotos causar una denegaci\u00f3n de servicio (corrupci\u00f3n de memoria) al desconectar incorrectamente sesiones SSL generando que las conexiones permanezcan en estado CLOSE-WAIT, tambi\u00e9n conocido como fallo ID CSCtg21685."
}
],
"id": "CVE-2010-2836",
"lastModified": "2025-04-11T00:51:21.963",
"metrics": {
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{
"acInsufInfo": false,
"baseSeverity": "HIGH",
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"authentication": "NONE",
"availabilityImpact": "COMPLETE",
"baseScore": 7.8,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:C",
"version": "2.0"
},
"exploitabilityScore": 10.0,
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"obtainAllPrivilege": false,
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"source": "nvd@nist.gov",
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}
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},
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"references": [
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"tags": [
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],
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},
{
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],
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}
],
"sourceIdentifier": "psirt@cisco.com",
"vulnStatus": "Deferred",
"weaknesses": [
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"value": "CWE-399"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
var-201009-0063
Vulnerability from variot
Memory leak in the SSL VPN feature in Cisco IOS 12.4, 15.0, and 15.1, when HTTP port redirection is enabled, allows remote attackers to cause a denial of service (memory consumption) by improperly disconnecting SSL sessions, leading to connections that remain in the CLOSE-WAIT state, aka Bug ID CSCtg21685. Cisco IOS is prone to a remote denial-of-service vulnerability. An attacker can exploit this issue to cause an affected device to reload or to stop accepting new TCP connections, denying service to legitimate users. This issue is tracked by Cisco Bug ID CSCtg21685. This vulnerability causes the connection to remain in the CLOSE-WAIT state. ----------------------------------------------------------------------
Windows Applications Insecure Library Loading
The Official, Verified Secunia List: http://secunia.com/advisories/windows_insecure_library_loading/
The list is continuously updated as we confirm the vulnerability reports so check back regularly too see if any of your apps are affected.
TITLE: Cisco IOS SSL VPN Memory Leak Denial of Service Vulnerability
SECUNIA ADVISORY ID: SA41552
VERIFY ADVISORY: Secunia.com http://secunia.com/advisories/41552/ Customer Area (Credentials Required) https://ca.secunia.com/?page=viewadvisory&vuln_id=41552
RELEASE DATE: 2010-09-24
DISCUSS ADVISORY: http://secunia.com/advisories/41552/#comments
AVAILABLE ON SITE AND IN CUSTOMER AREA: * Last Update * Popularity * Comments * Criticality Level * Impact * Where * Solution Status * Operating System / Software * CVE Reference(s)
http://secunia.com/advisories/41552/
ONLY AVAILABLE IN CUSTOMER AREA: * Authentication Level * Report Reliability * Secunia PoC * Secunia Analysis * Systems Affected * Approve Distribution * Remediation Status * Secunia CVSS Score * CVSS
https://ca.secunia.com/?page=viewadvisory&vuln_id=41552
ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI: * AUTOMATED SCANNING
http://secunia.com/vulnerability_scanning/personal/ http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/
DESCRIPTION: A vulnerability has been reported in Cisco IOS, which can be exploited by malicious people to cause a DoS (Denial of Service). This can be exploited to exhaust available memory resources and e.g.
SOLUTION: Update to a fixed version.
PROVIDED AND/OR DISCOVERED BY: Reported by the vendor.
ORIGINAL ADVISORY: cisco-sa-20100922-sslvpn: http://www.cisco.com/warp/public/707/cisco-sa-20100922-sslvpn.shtml
OTHER REFERENCES: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/
DEEP LINKS: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/
EXTENDED DESCRIPTION: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/
EXTENDED SOLUTION: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/
EXPLOIT: Further details available in Customer Area: http://secunia.com/products/corporate/EVM/
About: This Advisory was delivered by Secunia as a free service to help private users keeping their systems up to date against the latest vulnerabilities.
Subscribe: http://secunia.com/advisories/secunia_security_advisories/
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. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
Cisco IOS SSL VPN Vulnerability
Advisory ID: cisco-sa-20100922-sslvpn
http://www.cisco.com/warp/public/707/cisco-sa-20100922-sslvpn.shtml
Revision 1.0
For Public Release 2010 September 22 1600 UTC (GMT)
Summary
Cisco IOS Software contains a vulnerability when the Cisco IOS SSL VPN feature is configured with an HTTP redirect.
Cisco has released free software updates that address this vulnerability. There is a workaround to mitigate this vulnerability.
This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20100922-sslvpn.shtml
Note: The September 22, 2010, Cisco IOS Software Security Advisory bundled publication includes six Cisco Security Advisories. Five of the advisories address vulnerabilities in Cisco IOS Software, and one advisory addresses vulnerabilities in Cisco Unified Communications Manager. Each advisory lists the releases that correct the vulnerability or vulnerabilities detailed in the advisory. The table at the following URL lists releases that correct all Cisco IOS Software vulnerabilities that have been published on September 22, 2010, or earlier:
http://www.cisco.com/warp/public/707/cisco-sa-20100922-bundle.shtml
Individual publication links are in "Cisco Event Response: Semiannual Cisco IOS Software Security Advisory Bundled Publication" at the following link:
http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep10.html
Affected Products
Vulnerable Products +------------------
Devices running affected versions of Cisco IOS Software are vulnerable if configured with SSL VPN and HTTP port redirection.
The following methods may be used to confirm if the device is configured for Cisco IOS SSL VPNs and is vulnerable:
If the output from show running-config | include webvpn contains "webvpn gateway " then the device is supporting the Cisco IOS SSL VPN feature. A device is vulnerable if it has the inservice command in at least one of the "webvpn gateway" sections and is configured for HTTP port redirection. The following example shows a vulnerable device configured with Cisco IOS SSL VPN:
Router#show running | section webvpn
webvpn gateway Gateway
ip address 10.1.1.1 port 443
http-redirect port 80
ssl trustpoint Gateway-TP
inservice
!
Router#
A device that supports the Cisco IOS SSL VPN is not vulnerable if "webvpn gateway" is not configured.
To determine the Cisco IOS Software release that is running on a Cisco product, administrators can log in to the device and issue the show version command to display the system banner. The system banner confirms that the device is running Cisco IOS Software by displaying text similar to "Cisco Internetwork Operating System Software" or "Cisco IOS Software." The image name displays in parentheses, followed by "Version" and the Cisco IOS Software release name. Other Cisco devices do not have the show version command or may provide different output.
The following example identifies a Cisco product that is running Cisco IOS Software Release 12.4(20)T with an installed image name of C2800NM-ADVSECURITYK9-M:
Router#show version
Cisco IOS Software, 2800 Software (C2800NM-ADVSECURITYK9-M), Version 12.4(20)T, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2008 by Cisco Systems, Inc.
Compiled Thu 10-Jul-08 22:00 by prod_rel_team
! --- output truncated
Additional information about Cisco IOS Software release naming conventions is available in "White Paper: Cisco IOS Reference Guide" at the following link: http://www.cisco.com/warp/public/620/1.html
Products Confirmed Not Vulnerable +--------------------------------
The following products are not affected by this vulnerability:
- Cisco ASA 5500 Series Adaptive Security Appliances
- Cisco IOS XR Software
- Cisco IOS XE Software
No other Cisco products are currently known to be affected by this vulnerability.
Details
The Cisco IOS SSL VPN feature provides remote access to enterprise sites to users anywhere on the Internet. The SSL VPN provides users with secure access to specific enterprise applications, such as e-mail and web browsing, without requiring them to have VPN client software installed on their end-user devices. Authentication is not required to exploit this vulnerability.
A complete TCP 3-way handshake is required to exploit this vulnerability. The memory leak can be detected by running the command show tcp brief as shown in the following example:
Router#show tcp brief
TCB Local Address Foreign Address (state)
468BBDC0 192.168.0.22.80 192.168.0.33.19794 CLOSEWAIT
482D4730 192.168.0.22.80 192.168.0.33.22092 CLOSEWAIT
482779A4 192.168.0.22.80 192.168.0.33.16978 CLOSEWAIT
4693DEBC 192.168.0.22.80 192.168.0.33.21580 CLOSEWAIT
482D3418 192.168.0.22.80 192.168.0.33.17244 CLOSEWAIT
482B8ACC 192.168.0.22.80 192.168.0.33.16564 CLOSEWAIT
46954EB0 192.168.0.22.80 192.168.0.33.19532 CLOSEWAIT
468BA9B8 192.168.0.22.80 192.168.0.33.15781 CLOSEWAIT
482908C4 192.168.0.22.80 192.168.0.33.19275 CLOSEWAIT
4829D66C 192.168.0.22.80 192.168.0.33.19314 CLOSEWAIT
468A2D94 192.168.0.22.80 192.168.0.33.14736 CLOSEWAIT
4688F590 192.168.0.22.80 192.168.0.33.18786 CLOSEWAIT
4693CBA4 192.168.0.22.80 192.168.0.33.12176 CLOSEWAIT
4829ABC4 192.168.0.22.80 192.168.0.33.39629 CLOSEWAIT
4691206C 192.168.0.22.80 192.168.0.33.17818 CLOSEWAIT
46868224 192.168.0.22.80 192.168.0.33.16774 CLOSEWAIT
4832BFAC 192.168.0.22.80 192.168.0.33.39883 CLOSEWAIT
482D10CC 192.168.0.22.80 192.168.0.33.13677 CLOSEWAIT
4829B120 192.168.0.22.80 192.168.0.33.20870 CLOSEWAIT
482862FC 192.168.0.22.80 192.168.0.33.17035 CLOSEWAIT
482EC13C 192.168.0.22.80 192.168.0.33.16053 CLOSEWAIT
482901D8 192.168.0.22.80 192.168.0.33.16200 CLOSEWAIT
In the output above, the Transmission Control Blocks (TCBs) in the state CLOSEWAIT will not transition and represent a memory leak. Note that only TCP connections with a local TCP port of 80 (the well-known port for HTTP), as evidenced in the above example by a Local Address of 192.168.0.22.80, are relevant.
This vulnerability is documented in Cisco bug ID CSCtg21685 and Common Vulnerabilities and Exposures (CVE) identifier CVE-2010-2836 has been assigned to this vulnerability.
Vulnerability Scoring Details
Cisco has provided scores for the vulnerability in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this Security Advisory is done in accordance with CVSS version 2.0.
CVSS is a standards-based scoring method that conveys vulnerability severity and helps determine urgency and priority of response.
Cisco has provided a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks.
Cisco has provided an FAQ to answer additional questions regarding CVSS at
http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html
Cisco has also provided a CVSS calculator to help compute the environmental impact for individual networks at
http://intellishield.cisco.com/security/alertmanager/cvss
CSCtg21685 - SSLVPN : TCP remains stuck in closewait state
CVSS Base Score - 7.8 Access Vector Network Access Complexity Low Authentication None Confidentiality Impact None Integrity Impact None Availability Impact Complete
CVSS Temporal Score - 6.4 Exploitability Functional Remediation Level Official Fix Report Confidence Confirmed
Impact
Successful exploitation of the vulnerability may result in a lack of available memory resources on the affected device, which could affect new connections to the device such as SSH and Telnet connections. Depletion of memory resources may also result in failing of routing protocols and other services.
Software Versions and Fixes
When considering software upgrades, also consult http://www.cisco.com/go/psirt and any subsequent advisories to determine exposure and a complete upgrade solution.
In all cases, customers should exercise caution to be certain the devices to be upgraded contain sufficient memory and that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, contact the Cisco Technical Assistance Center (TAC) or your contracted maintenance provider for assistance.
Each row of the following Cisco IOS Software table corresponds to a Cisco IOS Software train. If a particular train is vulnerable, the earliest releases that contain the fix are listed in the First Fixed Release For This Advisory column. The First Fixed Release for All Advisories in the September 2010 Bundle Publication column lists the earliest possible releases that correct all the published vulnerabilities in the Cisco IOS Software Security Advisory bundled publication. Cisco recommends upgrading to the latest available release, where possible.
+-------------------------------------------------------------------+ | Major | Availability of Repaired Releases | | Release | | |------------+------------------------------------------------------| | Affected | First Fixed Release | First Fixed Release for All | | 12.0-Based | for This Advisory | Advisories in the September | | Releases | | 2010 Bundle Publication | |-------------------------------------------------------------------| | There are no affected 12.0 based releases | |-------------------------------------------------------------------| | Affected | First Fixed Release | First Fixed Release for All | | 12.1-Based | for This Advisory | Advisories in the September | | Releases | | 2010 Bundle Publication | |-------------------------------------------------------------------| | There are no affected 12.1 based releases | |-------------------------------------------------------------------| | Affected | First Fixed Release | First Fixed Release for All | | 12.2-Based | for This Advisory | Advisories in the September | | Releases | | 2010 Bundle Publication | |-------------------------------------------------------------------| | There are no affected 12.2 based releases | |-------------------------------------------------------------------| | Affected | First Fixed Release | First Fixed Release for All | | 12.3-Based | for This Advisory | Advisories in the September | | Releases | | 2010 Bundle Publication | |-------------------------------------------------------------------| | There are no affected 12.3 based releases | |-------------------------------------------------------------------| | Affected | First Fixed Release | First Fixed Release for All | | 12.4-Based | for This Advisory | Advisories in the September | | Releases | | 2010 Bundle Publication | |------------+----------------------+-------------------------------| | 12.4 | Not Vulnerable | 12.4(25d) | |------------+----------------------+-------------------------------| | 12.4GC | Not Vulnerable | 12.4(24)GC2 | |------------+----------------------+-------------------------------| | 12.4JA | Not Vulnerable | Not Vulnerable | |------------+----------------------+-------------------------------| | 12.4JDA | Not Vulnerable | Not Vulnerable | |------------+----------------------+-------------------------------| | 12.4JDC | Not Vulnerable | Not Vulnerable | |------------+----------------------+-------------------------------| | 12.4JDD | Not Vulnerable | Not Vulnerable | |------------+----------------------+-------------------------------| | 12.4JHA | Not Vulnerable | Not Vulnerable | |------------+----------------------+-------------------------------| | 12.4JHB | Not Vulnerable | Not Vulnerable | |------------+----------------------+-------------------------------| | 12.4JK | Not Vulnerable | Not Vulnerable | |------------+----------------------+-------------------------------| | 12.4JL | Not Vulnerable | Not Vulnerable | |------------+----------------------+-------------------------------| | 12.4JMA | Not Vulnerable | Not Vulnerable | |------------+----------------------+-------------------------------| | 12.4JMB | Not Vulnerable | Not Vulnerable | |------------+----------------------+-------------------------------| | 12.4JX | Not Vulnerable | Not Vulnerable | |------------+----------------------+-------------------------------| | 12.4JY | Not Vulnerable | Not Vulnerable | |------------+----------------------+-------------------------------| | 12.4MD | Not Vulnerable | 12.4(24)MD2 | |------------+----------------------+-------------------------------| | | | 12.4(22)MDA4 | | 12.4MDA | Not Vulnerable | | | | | 12.4(24)MDA1 | |------------+----------------------+-------------------------------| | 12.4MR | Not Vulnerable | Vulnerable; first fixed in | | | | 12.4MRA | |------------+----------------------+-------------------------------| | 12.4MRA | Not Vulnerable | 12.4(20)MRA1 | |------------+----------------------+-------------------------------| | 12.4SW | Not Vulnerable | Vulnerable; first fixed in | | | | 12.4T | |------------+----------------------+-------------------------------| | | Releases Prior to | | | | 12.4(15)T13 are not | | | | vulnerable. First | | | | fixed 12.4(15)T14 | | | | | 12.4(15)T14 | | | Releases Prior to | | | 12.4T | 12.4(20)T5 are not | 12.4(20)T6 | | | vulnerable. First | | | | fixed 12.4(20)T6 | 12.4(24)T4 | | | | | | | Releases Prior to | | | | 12.4(24)T2 are not | | | | vulnerable. First | | | | fixed 12.4(24)T4 | | |------------+----------------------+-------------------------------| | 12.4XA | Not Vulnerable | Vulnerable; first fixed in | | | | 12.4T | |------------+----------------------+-------------------------------| | 12.4XB | Not Vulnerable | Vulnerable; first fixed in | | | | 12.4T | |------------+----------------------+-------------------------------| | 12.4XC | Not Vulnerable | Vulnerable; first fixed in | | | | 12.4T | |------------+----------------------+-------------------------------| | 12.4XD | Not Vulnerable | Vulnerable; first fixed in | | | | 12.4T | |------------+----------------------+-------------------------------| | | | Releases prior to 12.4(6)XE5 | | | | are vulnerable, release 12.4 | | 12.4XE | Not Vulnerable | (6)XE5 and later are not | | | | vulnerable; first fixed in | | | | 12.4T | |------------+----------------------+-------------------------------| | 12.4XF | Not Vulnerable | Vulnerable; first fixed in | | | | 12.4T | |------------+----------------------+-------------------------------| | 12.4XG | Not Vulnerable | Vulnerable; first fixed in | | | | 12.4T | |------------+----------------------+-------------------------------| | 12.4XJ | Not Vulnerable | Vulnerable; first fixed in | | | | 12.4T | |------------+----------------------+-------------------------------| | 12.4XK | Not Vulnerable | Vulnerable; first fixed in | | | | 12.4T | |------------+----------------------+-------------------------------| | | | Vulnerable; Contact your | | | | support organization per the | | 12.4XL | Not Vulnerable | instructions in Obtaining | | | | Fixed Software section of | | | | this advisory | |------------+----------------------+-------------------------------| | 12.4XM | Not Vulnerable | Vulnerable; first fixed in | | | | 12.4T | |------------+----------------------+-------------------------------| | | | Vulnerable; Contact your | | | | support organization per the | | 12.4XN | Not Vulnerable | instructions in Obtaining | | | | Fixed Software section of | | | | this advisory | |------------+----------------------+-------------------------------| | | | Vulnerable; Contact your | | | | support organization per the | | 12.4XP | Not Vulnerable | instructions in Obtaining | | | | Fixed Software section of | | | | this advisory | |------------+----------------------+-------------------------------| | 12.4XQ | Not Vulnerable | 12.4(15)XQ6; Available on | | | | 22-SEP-10 | |------------+----------------------+-------------------------------| | | | 12.4(15)XR9 | | 12.4XR | Not Vulnerable | | | | | 12.4(22)XR7 | |------------+----------------------+-------------------------------| | 12.4XT | Not Vulnerable | Vulnerable; first fixed in | | | | 12.4T | |------------+----------------------+-------------------------------| | | | Vulnerable; Contact your | | | | support organization per the | | 12.4XV | Not Vulnerable | instructions in Obtaining | | | | Fixed Software section of | | | | this advisory | |------------+----------------------+-------------------------------| | 12.4XW | Not Vulnerable | Vulnerable; first fixed in | | | | 12.4T | |------------+----------------------+-------------------------------| | 12.4XY | Not Vulnerable | Vulnerable; first fixed in | | | | 12.4T | |------------+----------------------+-------------------------------| | 12.4XZ | Not Vulnerable | Vulnerable; first fixed in | | | | 12.4T | |------------+----------------------+-------------------------------| | 12.4YA | Not Vulnerable | Vulnerable; first fixed in | | | | 12.4T | |------------+----------------------+-------------------------------| | | | Vulnerable; Contact your | | | | support organization per the | | 12.4YB | Not Vulnerable | instructions in Obtaining | | | | Fixed Software section of | | | | this advisory | |------------+----------------------+-------------------------------| | | | Vulnerable; Contact your | | | | support organization per the | | 12.4YD | Not Vulnerable | instructions in Obtaining | | | | Fixed Software section of | | | | this advisory | |------------+----------------------+-------------------------------| | 12.4YE | Not Vulnerable | 12.4(24)YE1 | |------------+----------------------+-------------------------------| | 12.4YG | Not Vulnerable | 12.4(24)YG3 | |------------+----------------------+-------------------------------| | Affected | First Fixed Release | First Fixed Release for All | | 15.0-Based | for This Advisory | Advisories in the September | | Releases | | 2010 Bundle Publication | |------------+----------------------+-------------------------------| | 15.0M | 15.0(1)M3 | 15.0(1)M3 | |------------+----------------------+-------------------------------| | | Cisco 7600 and 10000 | Cisco 7600 and 10000 Series | | | Series routers: Not | routers: 15.0(1)S1 (available | | | vulnerable | early October 2010) | | 15.0S | | | | | Please see Cisco | Please see Cisco IOS-XE | | | IOS-XE Software | Software Availability | | | Availability | | |------------+----------------------+-------------------------------| | 15.0XA | Not Vulnerable | Vulnerable; first fixed in | | | | 15.1T | |------------+----------------------+-------------------------------| | 15.0XO | Not Vulnerable | Not Vulnerable | |------------+----------------------+-------------------------------| | Affected | First Fixed Release | First Fixed Release for All | | 15.1-Based | for This Advisory | Advisories in the September | | Releases | | 2010 Bundle Publication | |------------+----------------------+-------------------------------| | | 15.1(1)T1 | | | 15.1T | | 15.1(2)T1 | | | 15.1(2)T0a | | |------------+----------------------+-------------------------------| | | Vulnerability | Vulnerable; first fixed in | | 15.1XB | limited to 15.1(1) | 15.1T | | | XB1. | | +-------------------------------------------------------------------+
Cisco IOS XE Software +--------------------
+-------------------------------------------------------------------+ | Cisco IOS | First Fixed | First Fixed Release for All | | XE | Release for This | Advisories in the September 2010 | | Release | Advisory | Bundle Publication | |-----------+------------------+------------------------------------| | 2.1.x | Not Vulnerable | Not Vulnerable | |-----------+------------------+------------------------------------| | 2.2.x | Not Vulnerable | Not Vulnerable | |-----------+------------------+------------------------------------| | 2.3.x | Not Vulnerable | Not Vulnerable | |-----------+------------------+------------------------------------| | 2.4.x | Not Vulnerable | Not Vulnerable | |-----------+------------------+------------------------------------| | 2.5.x | Not Vulnerable | Vulnerable; migrate to 2.6.2 or | | | | later | |-----------+------------------+------------------------------------| | 2.6.x | Not Vulnerable | 2.6.2 | |-----------+------------------+------------------------------------| | 3.1.xS | Not Vulnerable | Not Vulnerable | +-------------------------------------------------------------------+
For mapping of Cisco IOS XE Software to Cisco IOS Software releases, please refer to the Cisco IOS XE 2 and Cisco IOS XE 3S Release Notes.
Cisco IOS XR System Software +---------------------------
Cisco IOS XR Software is not affected by the vulnerabilities disclosed in the September 22, 2010, Cisco IOS Software Security Advisory bundled publication.
Workarounds
Disabling HTTP redirection for SSL VPN connections can be used as a workaround for this vulnerability. HTTP redirection for SSL VPN connections is disabled by executing the command no http-redirect port in webvpn gateway configuration mode.
In addition, manually clearing the hung TCBs with the command clear tcp tcb * will transition the TCBs into a CLOSED state. After a time they will clear the CLOSED state and the memory will be released.
Note: Clearing the TCB will clear both legitimate and hung connections, including remote connections to the device such as Telnet and SSH connections.
The Cisco Applied Mitigation Bulletin (AMB) "Identifying and Mitigating Exploitation of the TCP State Manipulation Denial of Service Vulnerabilities in Multiple Cisco Products", available at http://www.cisco.com/warp/public/707/cisco-amb-20090908-tcp24.shtml, contains two mitigations (EEM scripts and SNMP) that can be used to detect and clear hung TCP connections.
Embedded Event Manager (EEM) +---------------------------
A Cisco IOS Embedded Event Manager (EEM) policy that is based on Tool Command Language (Tcl) can be used on vulnerable Cisco IOS devices to identify and detect a hung, extended, or indefinite TCP connection that is caused by this vulnerability. The policy allows administrators to monitor TCP connections on a Cisco IOS device. When Cisco IOS EEM detects potential exploitation of this vulnerability, the policy can trigger a response by sending a syslog message or a Simple Network Management Protocol (SNMP) trap to clear the TCP connection. The example policy provided in this document is based on a Tcl script that monitors and parses the output from two commands at defined intervals, produces a syslog message when the monitor threshold reaches its configured value, and can reset the TCP connection.
The Tcl script is available for download at the "Cisco Beyond: Embedded Event Manager (EEM) Scripting Community" at the following link: http://forums.cisco.com/eforum/servlet/EEM?page=eem&fn=script&scriptId=2041 A sample device configuration is provided below.
!
!-- Location where the Tcl script will be stored
!
event manager directory user policy disk0:/eem
!
!-- Define variable and set the monitoring interval
!-- as an integer (expressed in seconds)
!
event manager environment EEM_MONITOR_INTERVAL 60
!
!-- Define variable and set the threshold value as
!-- an integer for the number of retransmissions
!-- that determine if the TCP connection is hung
!-- (a recommended value to use is 15)
!
event manager environment EEM_MONITOR_THRESHOLD 15
!
!-- Define variable and set the value to "yes" to
!-- enable the clearing of hung TCP connections
!
event manager environment EEM_MONITOR_CLEAR yes
!
!-- Define variable and set to the TCP connection
!-- state or states that script will monitor, which
!-- can be a single state or a space-separated list
!-- of states
!
event manager environment EEM_MONITOR_STATES CLOSEWAIT
!
!-- Register the script as a Cisco EEM policy
!
event manager policy monitor-sockets.tcl
!
For more details, refer to the sections "EEM Detecting And Clearing Hung TCP Connection" and "Identification: Detecting and Clearing Hung TCP Connection Using SNMP" of this AMB at the following link: http://www.cisco.com/warp/public/707/cisco-amb-20090908-tcp24.shtml
Obtaining Fixed Software
Cisco has released free software updates that address these vulnerabilities. Prior to deploying software, customers should consult their maintenance provider or check the software for feature set compatibility and known issues specific to their environment.
Customers may only install and expect support for the feature sets they have purchased. By installing, downloading, accessing or otherwise using such software upgrades, customers agree to be bound by the terms of Cisco's software license terms found at http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html or as otherwise set forth at Cisco.com Downloads at http://www.cisco.com/public/sw-center/sw-usingswc.shtml
Do not contact psirt@cisco.com or security-alert@cisco.com for software upgrades.
Customers with Service Contracts +-------------------------------
Customers with contracts should obtain upgraded software through their regular update channels. For most customers, this means that upgrades should be obtained through the Software Center on Cisco's worldwide website at http://www.cisco.com
Customers using Third Party Support Organizations +------------------------------------------------
Customers whose Cisco products are provided or maintained through prior or existing agreements with third-party support organizations, such as Cisco Partners, authorized resellers, or service providers should contact that support organization for guidance and assistance with the appropriate course of action in regards to this advisory.
The effectiveness of any workaround or fix is dependent on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Due to the variety of affected products and releases, customers should consult with their service provider or support organization to ensure any applied workaround or fix is the most appropriate for use in the intended network before it is deployed.
Customers without Service Contracts +----------------------------------
Customers who purchase direct from Cisco but do not hold a Cisco service contract, and customers who purchase through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should acquire upgrades by contacting the Cisco Technical Assistance Center (TAC). TAC contacts are as follows.
- +1 800 553 2447 (toll free from within North America)
- +1 408 526 7209 (toll call from anywhere in the world)
- e-mail: tac@cisco.com
Customers should have their product serial number available and be prepared to give the URL of this notice as evidence of entitlement to a free upgrade. Free upgrades for non-contract customers must be requested through the TAC.
Refer to http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html for additional TAC contact information, including localized telephone numbers, and instructions and e-mail addresses for use in various languages.
Exploitation and Public Announcements
The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory.
This vulnerability was found during the troubleshooting of a customer service request.
Status of this Notice: FINAL
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A stand-alone copy or Paraphrase of the text of this document that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.
Distribution
This advisory is posted on Cisco's worldwide website at :
http://www.cisco.com/warp/public/707/cisco-sa-20100922-sslvpn.shtml
In addition to worldwide web posting, a text version of this notice is clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail and Usenet news recipients.
- cust-security-announce@cisco.com
- first-bulletins@lists.first.org
- bugtraq@securityfocus.com
- vulnwatch@vulnwatch.org
- cisco@spot.colorado.edu
- cisco-nsp@puck.nether.net
- full-disclosure@lists.grok.org.uk
- comp.dcom.sys.cisco@newsgate.cisco.com
Future updates of this advisory, if any, will be placed on Cisco's worldwide website, but may or may not be actively announced on mailing lists or newsgroups. Users concerned about this problem are encouraged to check the above URL for any updates.
Revision History
+-----------------------------------------+ | Revision | | Initial | | 1.0 | 2010-September-22 | public | | | | release. | +-----------------------------------------+
Cisco Security Procedures
Complete information on reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco, is available on Cisco's worldwide website at http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html This includes instructions for press inquiries regarding Cisco security notices. All Cisco security advisories are available at http://www.cisco.com/go/psirt -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (Darwin)
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Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
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"data": "Memory leak in the SSL VPN feature in Cisco IOS 12.4, 15.0, and 15.1, when HTTP port redirection is enabled, allows remote attackers to cause a denial of service (memory consumption) by improperly disconnecting SSL sessions, leading to connections that remain in the CLOSE-WAIT state, aka Bug ID CSCtg21685. Cisco IOS is prone to a remote denial-of-service vulnerability. \nAn attacker can exploit this issue to cause an affected device to reload or to stop accepting new TCP connections, denying service to legitimate users. \nThis issue is tracked by Cisco Bug ID CSCtg21685. This vulnerability causes the connection to remain in the CLOSE-WAIT state. ----------------------------------------------------------------------\n\n\nWindows Applications Insecure Library Loading\n\nThe Official, Verified Secunia List:\nhttp://secunia.com/advisories/windows_insecure_library_loading/\n\nThe list is continuously updated as we confirm the vulnerability reports so check back regularly too see if any of your apps are affected. \n\n\n----------------------------------------------------------------------\n\nTITLE:\nCisco IOS SSL VPN Memory Leak Denial of Service Vulnerability\n\nSECUNIA ADVISORY ID:\nSA41552\n\nVERIFY ADVISORY:\nSecunia.com\nhttp://secunia.com/advisories/41552/\nCustomer Area (Credentials Required)\nhttps://ca.secunia.com/?page=viewadvisory\u0026vuln_id=41552\n\nRELEASE DATE:\n2010-09-24\n\nDISCUSS ADVISORY:\nhttp://secunia.com/advisories/41552/#comments\n\nAVAILABLE ON SITE AND IN CUSTOMER AREA:\n * Last Update\n * Popularity\n * Comments\n * Criticality Level\n * Impact\n * Where\n * Solution Status\n * Operating System / Software\n * CVE Reference(s)\n\nhttp://secunia.com/advisories/41552/\n\nONLY AVAILABLE IN CUSTOMER AREA:\n * Authentication Level\n * Report Reliability\n * Secunia PoC\n * Secunia Analysis\n * Systems Affected\n * Approve Distribution\n * Remediation Status\n * Secunia CVSS Score\n * CVSS\n\nhttps://ca.secunia.com/?page=viewadvisory\u0026vuln_id=41552\n\nONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:\n * AUTOMATED SCANNING\n\nhttp://secunia.com/vulnerability_scanning/personal/\nhttp://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/\n\nDESCRIPTION:\nA vulnerability has been reported in Cisco IOS, which can be\nexploited by malicious people to cause a DoS (Denial of Service). This can be\nexploited to exhaust available memory resources and e.g. \n\nSOLUTION:\nUpdate to a fixed version. \n\nPROVIDED AND/OR DISCOVERED BY:\nReported by the vendor. \n\nORIGINAL ADVISORY:\ncisco-sa-20100922-sslvpn:\nhttp://www.cisco.com/warp/public/707/cisco-sa-20100922-sslvpn.shtml\n\nOTHER REFERENCES:\nFurther details available in Customer Area:\nhttp://secunia.com/products/corporate/EVM/\n\nDEEP LINKS:\nFurther details available in Customer Area:\nhttp://secunia.com/products/corporate/EVM/\n\nEXTENDED DESCRIPTION:\nFurther details available in Customer Area:\nhttp://secunia.com/products/corporate/EVM/\n\nEXTENDED SOLUTION:\nFurther details available in Customer Area:\nhttp://secunia.com/products/corporate/EVM/\n\nEXPLOIT:\nFurther details available in Customer Area:\nhttp://secunia.com/products/corporate/EVM/\n\n----------------------------------------------------------------------\n\nAbout:\nThis Advisory was delivered by Secunia as a free service to help\nprivate users keeping their systems up to date against the latest\nvulnerabilities. \n\nSubscribe:\nhttp://secunia.com/advisories/secunia_security_advisories/\n\nDefinitions: (Criticality, Where etc.)\nhttp://secunia.com/advisories/about_secunia_advisories/\n\n\nPlease Note:\nSecunia recommends that you verify all advisories you receive by\nclicking the link. \nSecunia NEVER sends attached files with advisories. \nSecunia does not advise people to install third party patches, only\nuse those supplied by the vendor. \n\n----------------------------------------------------------------------\n\nUnsubscribe: Secunia Security Advisories\nhttp://secunia.com/sec_adv_unsubscribe/?email=packet%40packetstormsecurity.org\n\n----------------------------------------------------------------------\n\n\n. -----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA1\n\nCisco IOS SSL VPN Vulnerability\n\nAdvisory ID: cisco-sa-20100922-sslvpn\n\nhttp://www.cisco.com/warp/public/707/cisco-sa-20100922-sslvpn.shtml\n\nRevision 1.0\n\nFor Public Release 2010 September 22 1600 UTC (GMT)\n\n- ---------------------------------------------------------------------\n\nSummary\n=======\n\nCisco IOS Software contains a vulnerability when the Cisco IOS SSL\nVPN feature is configured with an HTTP redirect. \n\nCisco has released free software updates that address this\nvulnerability. There is a workaround to mitigate this vulnerability. \n\nThis advisory is posted at \nhttp://www.cisco.com/warp/public/707/cisco-sa-20100922-sslvpn.shtml\n\nNote: The September 22, 2010, Cisco IOS Software Security Advisory\nbundled publication includes six Cisco Security Advisories. Five of\nthe advisories address vulnerabilities in Cisco IOS Software, and one\nadvisory addresses vulnerabilities in Cisco Unified Communications\nManager. Each advisory lists the releases that correct the\nvulnerability or vulnerabilities detailed in the advisory. The table\nat the following URL lists releases that correct all Cisco IOS\nSoftware vulnerabilities that have been published on September 22,\n2010, or earlier:\n\nhttp://www.cisco.com/warp/public/707/cisco-sa-20100922-bundle.shtml\n\nIndividual publication links are in \"Cisco Event Response: Semiannual\nCisco IOS Software Security Advisory Bundled Publication\" at the\nfollowing link:\n\nhttp://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep10.html\n\nAffected Products\n=================\n\nVulnerable Products\n+------------------\n\nDevices running affected versions of Cisco IOS Software are\nvulnerable if configured with SSL VPN and HTTP port redirection. \n\nThe following methods may be used to confirm if the device is\nconfigured for Cisco IOS SSL VPNs and is vulnerable:\n\nIf the output from show running-config | include webvpn contains\n\"webvpn gateway \u003cword\u003e\" then the device is supporting the Cisco IOS\nSSL VPN feature. A device is vulnerable if it has the inservice\ncommand in at least one of the \"webvpn gateway\" sections and is\nconfigured for HTTP port redirection. The following example shows a\nvulnerable device configured with Cisco IOS SSL VPN:\n\n Router#show running | section webvpn\n webvpn gateway Gateway\n ip address 10.1.1.1 port 443\n http-redirect port 80\n ssl trustpoint Gateway-TP\n inservice\n !\n Router#\n\nA device that supports the Cisco IOS SSL VPN is not vulnerable if\n\"webvpn gateway\" is not configured. \n\nTo determine the Cisco IOS Software release that is running on a\nCisco product, administrators can log in to the device and issue the\nshow version command to display the system banner. The system banner\nconfirms that the device is running Cisco IOS Software by displaying\ntext similar to \"Cisco Internetwork Operating System Software\" or\n\"Cisco IOS Software.\" The image name displays in parentheses,\nfollowed by \"Version\" and the Cisco IOS Software release name. Other\nCisco devices do not have the show version command or may provide\ndifferent output. \n\nThe following example identifies a Cisco product that is running\nCisco IOS Software Release 12.4(20)T with an installed image name of\nC2800NM-ADVSECURITYK9-M:\n\n Router#show version\n Cisco IOS Software, 2800 Software (C2800NM-ADVSECURITYK9-M), Version 12.4(20)T, RELEASE SOFTWARE (fc3)\n Technical Support: http://www.cisco.com/techsupport\n Copyright (c) 1986-2008 by Cisco Systems, Inc. \n Compiled Thu 10-Jul-08 22:00 by prod_rel_team\n\n ! --- output truncated\n\nAdditional information about Cisco IOS Software release naming\nconventions is available in \"White Paper: Cisco IOS Reference Guide\"\nat the following link: http://www.cisco.com/warp/public/620/1.html\n\nProducts Confirmed Not Vulnerable\n+--------------------------------\n\nThe following products are not affected by this vulnerability:\n\n * Cisco ASA 5500 Series Adaptive Security Appliances\n * Cisco IOS XR Software\n * Cisco IOS XE Software\n\nNo other Cisco products are currently known to be affected by this\nvulnerability. \n\nDetails\n=======\n\nThe Cisco IOS SSL VPN feature provides remote access to enterprise\nsites to users anywhere on the Internet. The SSL VPN provides users\nwith secure access to specific enterprise applications, such as\ne-mail and web browsing, without requiring them to have VPN client\nsoftware installed on their end-user devices. Authentication is not required to exploit this\nvulnerability. \n\nA complete TCP 3-way handshake is required to exploit this\nvulnerability. The memory leak can be detected by running the command\nshow tcp brief as shown in the following example:\n\n Router#show tcp brief\n TCB Local Address Foreign Address (state)\n 468BBDC0 192.168.0.22.80 192.168.0.33.19794 CLOSEWAIT\n 482D4730 192.168.0.22.80 192.168.0.33.22092 CLOSEWAIT\n 482779A4 192.168.0.22.80 192.168.0.33.16978 CLOSEWAIT\n 4693DEBC 192.168.0.22.80 192.168.0.33.21580 CLOSEWAIT\n 482D3418 192.168.0.22.80 192.168.0.33.17244 CLOSEWAIT\n 482B8ACC 192.168.0.22.80 192.168.0.33.16564 CLOSEWAIT\n 46954EB0 192.168.0.22.80 192.168.0.33.19532 CLOSEWAIT\n 468BA9B8 192.168.0.22.80 192.168.0.33.15781 CLOSEWAIT\n 482908C4 192.168.0.22.80 192.168.0.33.19275 CLOSEWAIT\n 4829D66C 192.168.0.22.80 192.168.0.33.19314 CLOSEWAIT\n 468A2D94 192.168.0.22.80 192.168.0.33.14736 CLOSEWAIT\n 4688F590 192.168.0.22.80 192.168.0.33.18786 CLOSEWAIT\n 4693CBA4 192.168.0.22.80 192.168.0.33.12176 CLOSEWAIT\n 4829ABC4 192.168.0.22.80 192.168.0.33.39629 CLOSEWAIT\n 4691206C 192.168.0.22.80 192.168.0.33.17818 CLOSEWAIT\n 46868224 192.168.0.22.80 192.168.0.33.16774 CLOSEWAIT\n 4832BFAC 192.168.0.22.80 192.168.0.33.39883 CLOSEWAIT\n 482D10CC 192.168.0.22.80 192.168.0.33.13677 CLOSEWAIT\n 4829B120 192.168.0.22.80 192.168.0.33.20870 CLOSEWAIT\n 482862FC 192.168.0.22.80 192.168.0.33.17035 CLOSEWAIT\n 482EC13C 192.168.0.22.80 192.168.0.33.16053 CLOSEWAIT\n 482901D8 192.168.0.22.80 192.168.0.33.16200 CLOSEWAIT\n\nIn the output above, the Transmission Control Blocks (TCBs) in the\nstate CLOSEWAIT will not transition and represent a memory leak. Note\nthat only TCP connections with a local TCP port of 80 (the well-known\nport for HTTP), as evidenced in the above example by a Local Address\nof 192.168.0.22.80, are relevant. \n\nThis vulnerability is documented in Cisco bug ID CSCtg21685 \nand Common Vulnerabilities and Exposures (CVE) identifier \nCVE-2010-2836 has been assigned to this vulnerability. \n\nVulnerability Scoring Details\n=============================\n\nCisco has provided scores for the vulnerability in this advisory\nbased on the Common Vulnerability Scoring System (CVSS). The CVSS\nscoring in this Security Advisory is done in accordance with CVSS\nversion 2.0. \n\nCVSS is a standards-based scoring method that conveys vulnerability\nseverity and helps determine urgency and priority of response. \n\nCisco has provided a base and temporal score. Customers can then\ncompute environmental scores to assist in determining the impact of\nthe vulnerability in individual networks. \n\nCisco has provided an FAQ to answer additional questions regarding\nCVSS at\n\nhttp://www.cisco.com/web/about/security/intelligence/cvss-qandas.html\n\nCisco has also provided a CVSS calculator to help compute the\nenvironmental impact for individual networks at\n\nhttp://intellishield.cisco.com/security/alertmanager/cvss\n\nCSCtg21685 - SSLVPN : TCP remains stuck in closewait state\n\nCVSS Base Score - 7.8\nAccess Vector Network\nAccess Complexity Low\nAuthentication None\nConfidentiality Impact None\nIntegrity Impact None\nAvailability Impact Complete\n\nCVSS Temporal Score - 6.4\nExploitability Functional\nRemediation Level Official Fix\nReport Confidence Confirmed\n\nImpact\n======\n\nSuccessful exploitation of the vulnerability may result in a lack of\navailable memory resources on the affected device, which could affect\nnew connections to the device such as SSH and Telnet connections. \nDepletion of memory resources may also result in failing of routing\nprotocols and other services. \n\nSoftware Versions and Fixes\n===========================\n\nWhen considering software upgrades, also consult \nhttp://www.cisco.com/go/psirt and any subsequent advisories to \ndetermine exposure and a complete upgrade solution. \n\nIn all cases, customers should exercise caution to be certain the\ndevices to be upgraded contain sufficient memory and that current\nhardware and software configurations will continue to be supported\nproperly by the new release. If the information is not clear, contact\nthe Cisco Technical Assistance Center (TAC) or your contracted\nmaintenance provider for assistance. \n\nEach row of the following Cisco IOS Software table corresponds to a\nCisco IOS Software train. If a particular train is vulnerable, the\nearliest releases that contain the fix are listed in the First Fixed\nRelease For This Advisory column. The First Fixed Release for All\nAdvisories in the September 2010 Bundle Publication column lists the\nearliest possible releases that correct all the published\nvulnerabilities in the Cisco IOS Software Security Advisory bundled\npublication. Cisco recommends upgrading to the latest available\nrelease, where possible. \n\n+-------------------------------------------------------------------+\n| Major | Availability of Repaired Releases |\n| Release | |\n|------------+------------------------------------------------------|\n| Affected | First Fixed Release | First Fixed Release for All |\n| 12.0-Based | for This Advisory | Advisories in the September |\n| Releases | | 2010 Bundle Publication |\n|-------------------------------------------------------------------|\n| There are no affected 12.0 based releases |\n|-------------------------------------------------------------------|\n| Affected | First Fixed Release | First Fixed Release for All |\n| 12.1-Based | for This Advisory | Advisories in the September |\n| Releases | | 2010 Bundle Publication |\n|-------------------------------------------------------------------|\n| There are no affected 12.1 based releases |\n|-------------------------------------------------------------------|\n| Affected | First Fixed Release | First Fixed Release for All |\n| 12.2-Based | for This Advisory | Advisories in the September |\n| Releases | | 2010 Bundle Publication |\n|-------------------------------------------------------------------|\n| There are no affected 12.2 based releases |\n|-------------------------------------------------------------------|\n| Affected | First Fixed Release | First Fixed Release for All |\n| 12.3-Based | for This Advisory | Advisories in the September |\n| Releases | | 2010 Bundle Publication |\n|-------------------------------------------------------------------|\n| There are no affected 12.3 based releases |\n|-------------------------------------------------------------------|\n| Affected | First Fixed Release | First Fixed Release for All |\n| 12.4-Based | for This Advisory | Advisories in the September |\n| Releases | | 2010 Bundle Publication |\n|------------+----------------------+-------------------------------|\n| 12.4 | Not Vulnerable | 12.4(25d) |\n|------------+----------------------+-------------------------------|\n| 12.4GC | Not Vulnerable | 12.4(24)GC2 |\n|------------+----------------------+-------------------------------|\n| 12.4JA | Not Vulnerable | Not Vulnerable |\n|------------+----------------------+-------------------------------|\n| 12.4JDA | Not Vulnerable | Not Vulnerable |\n|------------+----------------------+-------------------------------|\n| 12.4JDC | Not Vulnerable | Not Vulnerable |\n|------------+----------------------+-------------------------------|\n| 12.4JDD | Not Vulnerable | Not Vulnerable |\n|------------+----------------------+-------------------------------|\n| 12.4JHA | Not Vulnerable | Not Vulnerable |\n|------------+----------------------+-------------------------------|\n| 12.4JHB | Not Vulnerable | Not Vulnerable |\n|------------+----------------------+-------------------------------|\n| 12.4JK | Not Vulnerable | Not Vulnerable |\n|------------+----------------------+-------------------------------|\n| 12.4JL | Not Vulnerable | Not Vulnerable |\n|------------+----------------------+-------------------------------|\n| 12.4JMA | Not Vulnerable | Not Vulnerable |\n|------------+----------------------+-------------------------------|\n| 12.4JMB | Not Vulnerable | Not Vulnerable |\n|------------+----------------------+-------------------------------|\n| 12.4JX | Not Vulnerable | Not Vulnerable |\n|------------+----------------------+-------------------------------|\n| 12.4JY | Not Vulnerable | Not Vulnerable |\n|------------+----------------------+-------------------------------|\n| 12.4MD | Not Vulnerable | 12.4(24)MD2 |\n|------------+----------------------+-------------------------------|\n| | | 12.4(22)MDA4 |\n| 12.4MDA | Not Vulnerable | |\n| | | 12.4(24)MDA1 |\n|------------+----------------------+-------------------------------|\n| 12.4MR | Not Vulnerable | Vulnerable; first fixed in |\n| | | 12.4MRA |\n|------------+----------------------+-------------------------------|\n| 12.4MRA | Not Vulnerable | 12.4(20)MRA1 |\n|------------+----------------------+-------------------------------|\n| 12.4SW | Not Vulnerable | Vulnerable; first fixed in |\n| | | 12.4T |\n|------------+----------------------+-------------------------------|\n| | Releases Prior to | |\n| | 12.4(15)T13 are not | |\n| | vulnerable. First | |\n| | fixed 12.4(15)T14 | |\n| | | 12.4(15)T14 |\n| | Releases Prior to | |\n| 12.4T | 12.4(20)T5 are not | 12.4(20)T6 |\n| | vulnerable. First | |\n| | fixed 12.4(20)T6 | 12.4(24)T4 |\n| | | |\n| | Releases Prior to | |\n| | 12.4(24)T2 are not | |\n| | vulnerable. First | |\n| | fixed 12.4(24)T4 | |\n|------------+----------------------+-------------------------------|\n| 12.4XA | Not Vulnerable | Vulnerable; first fixed in |\n| | | 12.4T |\n|------------+----------------------+-------------------------------|\n| 12.4XB | Not Vulnerable | Vulnerable; first fixed in |\n| | | 12.4T |\n|------------+----------------------+-------------------------------|\n| 12.4XC | Not Vulnerable | Vulnerable; first fixed in |\n| | | 12.4T |\n|------------+----------------------+-------------------------------|\n| 12.4XD | Not Vulnerable | Vulnerable; first fixed in |\n| | | 12.4T |\n|------------+----------------------+-------------------------------|\n| | | Releases prior to 12.4(6)XE5 |\n| | | are vulnerable, release 12.4 |\n| 12.4XE | Not Vulnerable | (6)XE5 and later are not |\n| | | vulnerable; first fixed in |\n| | | 12.4T |\n|------------+----------------------+-------------------------------|\n| 12.4XF | Not Vulnerable | Vulnerable; first fixed in |\n| | | 12.4T |\n|------------+----------------------+-------------------------------|\n| 12.4XG | Not Vulnerable | Vulnerable; first fixed in |\n| | | 12.4T |\n|------------+----------------------+-------------------------------|\n| 12.4XJ | Not Vulnerable | Vulnerable; first fixed in |\n| | | 12.4T |\n|------------+----------------------+-------------------------------|\n| 12.4XK | Not Vulnerable | Vulnerable; first fixed in |\n| | | 12.4T |\n|------------+----------------------+-------------------------------|\n| | | Vulnerable; Contact your |\n| | | support organization per the |\n| 12.4XL | Not Vulnerable | instructions in Obtaining |\n| | | Fixed Software section of |\n| | | this advisory |\n|------------+----------------------+-------------------------------|\n| 12.4XM | Not Vulnerable | Vulnerable; first fixed in |\n| | | 12.4T |\n|------------+----------------------+-------------------------------|\n| | | Vulnerable; Contact your |\n| | | support organization per the |\n| 12.4XN | Not Vulnerable | instructions in Obtaining |\n| | | Fixed Software section of |\n| | | this advisory |\n|------------+----------------------+-------------------------------|\n| | | Vulnerable; Contact your |\n| | | support organization per the |\n| 12.4XP | Not Vulnerable | instructions in Obtaining |\n| | | Fixed Software section of |\n| | | this advisory |\n|------------+----------------------+-------------------------------|\n| 12.4XQ | Not Vulnerable | 12.4(15)XQ6; Available on |\n| | | 22-SEP-10 |\n|------------+----------------------+-------------------------------|\n| | | 12.4(15)XR9 |\n| 12.4XR | Not Vulnerable | |\n| | | 12.4(22)XR7 |\n|------------+----------------------+-------------------------------|\n| 12.4XT | Not Vulnerable | Vulnerable; first fixed in |\n| | | 12.4T |\n|------------+----------------------+-------------------------------|\n| | | Vulnerable; Contact your |\n| | | support organization per the |\n| 12.4XV | Not Vulnerable | instructions in Obtaining |\n| | | Fixed Software section of |\n| | | this advisory |\n|------------+----------------------+-------------------------------|\n| 12.4XW | Not Vulnerable | Vulnerable; first fixed in |\n| | | 12.4T |\n|------------+----------------------+-------------------------------|\n| 12.4XY | Not Vulnerable | Vulnerable; first fixed in |\n| | | 12.4T |\n|------------+----------------------+-------------------------------|\n| 12.4XZ | Not Vulnerable | Vulnerable; first fixed in |\n| | | 12.4T |\n|------------+----------------------+-------------------------------|\n| 12.4YA | Not Vulnerable | Vulnerable; first fixed in |\n| | | 12.4T |\n|------------+----------------------+-------------------------------|\n| | | Vulnerable; Contact your |\n| | | support organization per the |\n| 12.4YB | Not Vulnerable | instructions in Obtaining |\n| | | Fixed Software section of |\n| | | this advisory |\n|------------+----------------------+-------------------------------|\n| | | Vulnerable; Contact your |\n| | | support organization per the |\n| 12.4YD | Not Vulnerable | instructions in Obtaining |\n| | | Fixed Software section of |\n| | | this advisory |\n|------------+----------------------+-------------------------------|\n| 12.4YE | Not Vulnerable | 12.4(24)YE1 |\n|------------+----------------------+-------------------------------|\n| 12.4YG | Not Vulnerable | 12.4(24)YG3 |\n|------------+----------------------+-------------------------------|\n| Affected | First Fixed Release | First Fixed Release for All |\n| 15.0-Based | for This Advisory | Advisories in the September |\n| Releases | | 2010 Bundle Publication |\n|------------+----------------------+-------------------------------|\n| 15.0M | 15.0(1)M3 | 15.0(1)M3 |\n|------------+----------------------+-------------------------------|\n| | Cisco 7600 and 10000 | Cisco 7600 and 10000 Series |\n| | Series routers: Not | routers: 15.0(1)S1 (available |\n| | vulnerable | early October 2010) |\n| 15.0S | | |\n| | Please see Cisco | Please see Cisco IOS-XE |\n| | IOS-XE Software | Software Availability |\n| | Availability | |\n|------------+----------------------+-------------------------------|\n| 15.0XA | Not Vulnerable | Vulnerable; first fixed in |\n| | | 15.1T |\n|------------+----------------------+-------------------------------|\n| 15.0XO | Not Vulnerable | Not Vulnerable |\n|------------+----------------------+-------------------------------|\n| Affected | First Fixed Release | First Fixed Release for All |\n| 15.1-Based | for This Advisory | Advisories in the September |\n| Releases | | 2010 Bundle Publication |\n|------------+----------------------+-------------------------------|\n| | 15.1(1)T1 | |\n| 15.1T | | 15.1(2)T1 |\n| | 15.1(2)T0a | |\n|------------+----------------------+-------------------------------|\n| | Vulnerability | Vulnerable; first fixed in |\n| 15.1XB | limited to 15.1(1) | 15.1T |\n| | XB1. | |\n+-------------------------------------------------------------------+\n\nCisco IOS XE Software\n+--------------------\n\n+-------------------------------------------------------------------+\n| Cisco IOS | First Fixed | First Fixed Release for All |\n| XE | Release for This | Advisories in the September 2010 |\n| Release | Advisory | Bundle Publication |\n|-----------+------------------+------------------------------------|\n| 2.1.x | Not Vulnerable | Not Vulnerable |\n|-----------+------------------+------------------------------------|\n| 2.2.x | Not Vulnerable | Not Vulnerable |\n|-----------+------------------+------------------------------------|\n| 2.3.x | Not Vulnerable | Not Vulnerable |\n|-----------+------------------+------------------------------------|\n| 2.4.x | Not Vulnerable | Not Vulnerable |\n|-----------+------------------+------------------------------------|\n| 2.5.x | Not Vulnerable | Vulnerable; migrate to 2.6.2 or |\n| | | later |\n|-----------+------------------+------------------------------------|\n| 2.6.x | Not Vulnerable | 2.6.2 |\n|-----------+------------------+------------------------------------|\n| 3.1.xS | Not Vulnerable | Not Vulnerable |\n+-------------------------------------------------------------------+\n\nFor mapping of Cisco IOS XE Software to Cisco IOS Software releases,\nplease refer to the Cisco IOS XE 2 and Cisco IOS XE 3S Release Notes. \n\nCisco IOS XR System Software\n+---------------------------\n\nCisco IOS XR Software is not affected by the vulnerabilities\ndisclosed in the September 22, 2010, Cisco IOS Software Security\nAdvisory bundled publication. \n\nWorkarounds\n===========\n\nDisabling HTTP redirection for SSL VPN connections can be used as a\nworkaround for this vulnerability. HTTP redirection for SSL VPN\nconnections is disabled by executing the command no http-redirect\nport in webvpn gateway configuration mode. \n\nIn addition, manually clearing the hung TCBs with the command clear\ntcp tcb * will transition the TCBs into a CLOSED state. After a time\nthey will clear the CLOSED state and the memory will be released. \n\nNote: Clearing the TCB will clear both legitimate and hung\nconnections, including remote connections to the device such as\nTelnet and SSH connections. \n\nThe Cisco Applied Mitigation Bulletin (AMB) \"Identifying and\nMitigating Exploitation of the TCP State Manipulation Denial of\nService Vulnerabilities in Multiple Cisco Products\", available at\nhttp://www.cisco.com/warp/public/707/cisco-amb-20090908-tcp24.shtml,\ncontains two mitigations (EEM scripts and SNMP) that can be used to\ndetect and clear hung TCP connections. \n\nEmbedded Event Manager (EEM)\n+---------------------------\n\nA Cisco IOS Embedded Event Manager (EEM) policy that is based on Tool\nCommand Language (Tcl) can be used on vulnerable Cisco IOS devices to\nidentify and detect a hung, extended, or indefinite TCP connection\nthat is caused by this vulnerability. The policy allows\nadministrators to monitor TCP connections on a Cisco IOS device. When\nCisco IOS EEM detects potential exploitation of this vulnerability,\nthe policy can trigger a response by sending a syslog message or a\nSimple Network Management Protocol (SNMP) trap to clear the TCP\nconnection. The example policy provided in this document is based on\na Tcl script that monitors and parses the output from two commands at\ndefined intervals, produces a syslog message when the monitor\nthreshold reaches its configured value, and can reset the TCP\nconnection. \n\nThe Tcl script is available for download at the \"Cisco Beyond:\nEmbedded Event Manager (EEM) Scripting Community\" at the following\nlink: http://forums.cisco.com/eforum/servlet/EEM?page=eem\u0026fn=script\u0026scriptId=2041\nA sample device configuration is provided below. \n\n\n !\n !-- Location where the Tcl script will be stored\n !\n\n event manager directory user policy disk0:/eem\n\n !\n !-- Define variable and set the monitoring interval\n !-- as an integer (expressed in seconds)\n !\n\n event manager environment EEM_MONITOR_INTERVAL 60\n\n !\n !-- Define variable and set the threshold value as\n !-- an integer for the number of retransmissions\n !-- that determine if the TCP connection is hung\n !-- (a recommended value to use is 15)\n !\n\n event manager environment EEM_MONITOR_THRESHOLD 15\n\n !\n !-- Define variable and set the value to \"yes\" to\n !-- enable the clearing of hung TCP connections\n !\n\n event manager environment EEM_MONITOR_CLEAR yes\n\n !\n !-- Define variable and set to the TCP connection\n !-- state or states that script will monitor, which\n !-- can be a single state or a space-separated list\n !-- of states\n !\n\n event manager environment EEM_MONITOR_STATES CLOSEWAIT\n\n !\n !-- Register the script as a Cisco EEM policy\n !\n\n event manager policy monitor-sockets.tcl\n\n !\n\nFor more details, refer to the sections \"EEM Detecting And Clearing\nHung TCP Connection\" and \"Identification: Detecting and Clearing Hung\nTCP Connection Using SNMP\" of this AMB at the following link: \nhttp://www.cisco.com/warp/public/707/cisco-amb-20090908-tcp24.shtml\n\nObtaining Fixed Software\n========================\n\nCisco has released free software updates that address these\nvulnerabilities. Prior to deploying software, customers should\nconsult their maintenance provider or check the software for feature\nset compatibility and known issues specific to their environment. \n\nCustomers may only install and expect support for the feature sets\nthey have purchased. By installing, downloading, accessing or\notherwise using such software upgrades, customers agree to be bound\nby the terms of Cisco\u0027s software license terms found at \nhttp://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html\nor as otherwise set forth at Cisco.com Downloads at \nhttp://www.cisco.com/public/sw-center/sw-usingswc.shtml\n\nDo not contact psirt@cisco.com or security-alert@cisco.com for\nsoftware upgrades. \n\nCustomers with Service Contracts\n+-------------------------------\n\nCustomers with contracts should obtain upgraded software through\ntheir regular update channels. For most customers, this means that\nupgrades should be obtained through the Software Center on Cisco\u0027s\nworldwide website at http://www.cisco.com\n\nCustomers using Third Party Support Organizations\n+------------------------------------------------\n\nCustomers whose Cisco products are provided or maintained through\nprior or existing agreements with third-party support organizations,\nsuch as Cisco Partners, authorized resellers, or service providers\nshould contact that support organization for guidance and assistance\nwith the appropriate course of action in regards to this advisory. \n\nThe effectiveness of any workaround or fix is dependent on specific\ncustomer situations, such as product mix, network topology, traffic\nbehavior, and organizational mission. Due to the variety of affected\nproducts and releases, customers should consult with their service\nprovider or support organization to ensure any applied workaround or\nfix is the most appropriate for use in the intended network before it\nis deployed. \n\nCustomers without Service Contracts\n+----------------------------------\n\nCustomers who purchase direct from Cisco but do not hold a Cisco\nservice contract, and customers who purchase through third-party\nvendors but are unsuccessful in obtaining fixed software through\ntheir point of sale should acquire upgrades by contacting the Cisco\nTechnical Assistance Center (TAC). TAC contacts are as follows. \n\n * +1 800 553 2447 (toll free from within North America)\n * +1 408 526 7209 (toll call from anywhere in the world)\n * e-mail: tac@cisco.com\n\nCustomers should have their product serial number available and be\nprepared to give the URL of this notice as evidence of entitlement to\na free upgrade. Free upgrades for non-contract customers must be\nrequested through the TAC. \n\nRefer to \nhttp://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html\nfor additional TAC contact information, including localized telephone \nnumbers, and instructions and e-mail addresses for use in various \nlanguages. \n\nExploitation and Public Announcements\n=====================================\n\nThe Cisco PSIRT is not aware of any public announcements or malicious\nuse of the vulnerability described in this advisory. \n\nThis vulnerability was found during the troubleshooting of a customer\nservice request. \n\nStatus of this Notice: FINAL\n============================\n\nTHIS DOCUMENT IS PROVIDED ON AN \"AS IS\" BASIS AND DOES NOT IMPLY ANY\nKIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF\nMERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE\nINFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS\nAT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS\nDOCUMENT AT ANY TIME. \n\nA stand-alone copy or Paraphrase of the text of this document that\nomits the distribution URL in the following section is an\nuncontrolled copy, and may lack important information or contain\nfactual errors. \n\nDistribution\n============\n\nThis advisory is posted on Cisco\u0027s worldwide website at :\n\nhttp://www.cisco.com/warp/public/707/cisco-sa-20100922-sslvpn.shtml\n\nIn addition to worldwide web posting, a text version of this notice\nis clear-signed with the Cisco PSIRT PGP key and is posted to the\nfollowing e-mail and Usenet news recipients. \n\n * cust-security-announce@cisco.com\n * first-bulletins@lists.first.org\n * bugtraq@securityfocus.com\n * vulnwatch@vulnwatch.org\n * cisco@spot.colorado.edu\n * cisco-nsp@puck.nether.net\n * full-disclosure@lists.grok.org.uk\n * comp.dcom.sys.cisco@newsgate.cisco.com\n\nFuture updates of this advisory, if any, will be placed on Cisco\u0027s\nworldwide website, but may or may not be actively announced on\nmailing lists or newsgroups. Users concerned about this problem are\nencouraged to check the above URL for any updates. \n\nRevision History\n================\n\n+-----------------------------------------+\n| Revision | | Initial |\n| 1.0 | 2010-September-22 | public |\n| | | release. |\n+-----------------------------------------+\n\nCisco Security Procedures\n=========================\n\nComplete information on reporting security vulnerabilities in Cisco\nproducts, obtaining assistance with security incidents, and\nregistering to receive security information from Cisco, is available\non Cisco\u0027s worldwide website at \nhttp://www.cisco.com/en/US/products/products_security_vulnerability_policy.html\nThis includes instructions for press inquiries regarding Cisco \nsecurity notices. All Cisco security advisories are available at \nhttp://www.cisco.com/go/psirt\n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v1.4.10 (Darwin)\n\niEYEARECAAYFAkyZ/SwACgkQ86n/Gc8U/uBPYgCeOBY4HQKl1sgyp7mu9zl98VNK\nw84AoIVgVbW4s5KylgyKFiRAxFVUkiSZ\n=eC+N\n-----END PGP SIGNATURE-----\n\n_______________________________________________\nFull-Disclosure - We believe in it. \nCharter: http://lists.grok.org.uk/full-disclosure-charter.html\nHosted and sponsored by Secunia - http://secunia.com/\n",
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.