var-200903-0277
Vulnerability from variot
Multiple unspecified vulnerabilities in the home agent (HA) implementation in the (1) Mobile IP NAT Traversal feature and (2) Mobile IPv6 subsystem in Cisco IOS 12.3 through 12.4 allow remote attackers to cause a denial of service (input queue wedge and interface outage) via an ICMP packet, aka Bug ID CSCso05337. This vulnerability Bug ID : CSCso05337 Vulnerabilities. Cisco IOS is prone to multiple remote denial-of-service vulnerabilities. Successfully exploiting these issues allows remote attackers to crash the targeted device, denying service to legitimate users. These issues are tracked by Cisco Bug IDs CSCsm97220 and CSCso05337. This vulnerability can only be successfully exploited when the attack packet must be explicitly sent to the router instead of an intermediate packet.
Cisco has released free software updates that address these vulnerabilities.
This advisory is posted at the following link http://www.cisco.com/warp/public/707/cisco-sa-20090325-mobileip.shtml
Note: The March 25, 2009, Cisco IOS Security Advisory bundled publication includes eight Security Advisories. Each advisory lists the releases that correct the vulnerability or vulnerabilities in the advisory. The following table lists releases that correct all Cisco IOS Software vulnerabilities that have been published in Cisco Security Advisories on March 25, 2009, or earlier. 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 12.3(26) with an installed image name of C2500-IS-L:
Router#show version
Cisco Internetwork Operating System Software
IOS (tm) 2500 Software (C2500-IS-L), Version 12.3(26), RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2008 by cisco Systems, Inc.
Compiled Mon 17-Mar-08 14:39 by dchih
!--- output truncated
The following example identifies a Cisco product that is running Cisco IOS Software Release 12.4(20)T with an installed image name of C1841-ADVENTERPRISEK9-M:
Router#show version
Cisco IOS Software, 1841 Software (C1841-ADVENTERPRISEK9-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 20:25 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 +--------------------------------
Cisco IOS XR is not affected by these vulnerabilities.
No other Cisco products are currently known to be affected by these vulnerabilities.
Details
Mobile IP is part of both IPv4 and IPv6 standards. Mobile IP allows a host device to be identified by a single IP address even though the device may move its physical point of attachment from one network to another. Regardless of movement between different networks, connectivity at the different points is achieved seamlessly without user intervention. Roaming from a wired network to a wireless or wide-area network is also possible.
More information on Mobile IPv6 can be found at the following link: http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-mobile.html
The Mobile IP Support NAT Traversal feature is documented in RFC 3519. It introduces an alternative method for tunneling Mobile IP data traffic. New extensions in the Mobile IP registration request and reply messages have been added for establishing User Datagram Protocol (UDP) tunneling. This feature allows mobile devices in collocated mode that use a private IP address (RFC 1918) or foreign agents (FAs) that use a private IP address for the care-of address (CoA) to establish a tunnel and traverse a NAT-enabled router with mobile node (MN) data traffic from the home agent (HA). A successful exploitation of this vulnerability could cause an interface to stop processing traffic until the system is restarted. Offending packets need to be destined to the router for a successful exploit.
Vulnerability Scoring Details
Cisco has provided scores for the vulnerabilities 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
CSCsm97220 - Input queue wedged by MIPv6 packets
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
CSCso05337 - HA: Input queue wedged by ICMP packet
CVSS Base Score - 7.1
Access Vector - Network Access Complexity - Medium Authentication - None Confidentiality Impact - None Integrity Impact - None Availability Impact - Complete
CVSS Temporal Score - 5.9
Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed
Impact
Successful exploitation of the vulnerability may result in an interface to stop processing traffic, causing a DoS condition.
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 Cisco IOS software table (below) names a Cisco IOS release train. If a given release train is vulnerable, then the earliest possible releases that contain the fix (along with the anticipated date of availability for each, if applicable) are listed in the "First Fixed Release" column of the table. The "Recommended Release" column indicates the releases which have fixes for all the published vulnerabilities at the time of this Advisory. A device running a release in the given train that is earlier than the release in a specific column (less than the First Fixed Release) is known to be vulnerable. Cisco recommends upgrading to a release equal to or later than the release in the "Recommended Releases" column of the table.
+-------------------------------------------------------------------+ | Major | Availability of Repaired Releases | | Release | | |------------+------------------------------------------------------| | Affected | | Recommended | | 12.0-Based | First Fixed Release | Release | | Releases | | | |-------------------------------------------------------------------| | There are no affected 12.0 based releases | |-------------------------------------------------------------------| | Affected | | Recommended | | 12.1-Based | First Fixed Release | Release | | Releases | | | |-------------------------------------------------------------------| | There are no affected 12.1 based releases | |-------------------------------------------------------------------| | Affected | | Recommended | | 12.2-Based | First Fixed Release | Release | | Releases | | | |-------------------------------------------------------------------| | There are no affected 12.2 based releases | |-------------------------------------------------------------------| | Affected | | Recommended | | 12.3-Based | First Fixed Release | Release | | Releases | | | |------------+--------------------------------------+---------------| | 12.3 | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3B | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3BC | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3BW | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3EU | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3JA | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3JEA | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3JEB | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3JEC | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3JK | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3JL | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3JX | Not Vulnerable | | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.3T | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | 12.3TPC | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3VA | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XA | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XB | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XC | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XD | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XE | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XF | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XG | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XI | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XJ | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XK | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XL | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XQ | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XR | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XS | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XU | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XW | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XX | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XY | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3XZ | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3YA | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3YD | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3YF | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3YG | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3YH | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3YI | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3YJ | Not Vulnerable | | |------------+--------------------------------------+---------------| | | Releases prior to 12.3(11)YK3 are | 12.4(22)T1 | | | vulnerable, release 12.3(11)YK3 and | | | 12.3YK | later are not vulnerable; first | 12.4(15)T9; | | | fixed in 12.4T | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | 12.3YM | 12.3(14)YM13 | 12.3(14)YM13 | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.3YQ | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.3YS | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.3YT | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.3YU | Vulnerable; migrate to 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | | Releases prior to 12.3(14)YX10 are | | | 12.3YX | vulnerable, release 12.3(14)YX10 and | 12.3(14)YX14 | | | later are not vulnerable; | | |------------+--------------------------------------+---------------| | 12.3YZ | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.3ZA | Not Vulnerable | | |------------+--------------------------------------+---------------| | Affected | | Recommended | | 12.4-Based | First Fixed Release | Release | | Releases | | | |------------+--------------------------------------+---------------| | | | 12.4(18e) | | | 12.4(18e) | | | 12.4 | | 12.4(23a); | | | 12.4(23a); Available on 30-APR-2009 | Available on | | | | 30-APR-2009 | |------------+--------------------------------------+---------------| | 12.4JA | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.4JDA | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.4JK | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.4JL | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.4JMA | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.4JMB | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.4JX | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.4MD | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.4MR | 12.4(19)MR | 12.4(19)MR2 | |------------+--------------------------------------+---------------| | 12.4SW | Not Vulnerable | | |------------+--------------------------------------+---------------| | | 12.4(20)T | 12.4(22)T1 | | | | | | 12.4T | 12.4(15)T8 | 12.4(15)T9; | | | | Available on | | | 12.4(15)T9; Available on 29-APR-2009 | 29-APR-2009 | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.4XA | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | | 12.4(15)T8 | 12.4(22)T1 | | | | | | 12.4XB | 12.4(20)T | 12.4(15)T9; | | | | Available on | | | 12.4(15)T9; Available on 29-APR-2009 | 29-APR-2009 | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.4XC | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | | 12.4(4)XD12; Available on | 12.4(4)XD12; | | 12.4XD | 27-MAR-2009 | Available on | | | | 27-MAR-2009 | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.4XE | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.4XF | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | 12.4XG | Not Vulnerable | | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.4XJ | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | 12.4XK | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.4XL | 12.4(15)XL4 | 12.4(15)XL4 | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.4XM | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | 12.4XN | Vulnerable; contact TAC | | |------------+--------------------------------------+---------------| | 12.4XP | Vulnerable; contact TAC | | |------------+--------------------------------------+---------------| | 12.4XQ | 12.4(15)XQ2 | 12.4(15)XQ2 | |------------+--------------------------------------+---------------| | 12.4XR | 12.4(15)XR4 | 12.4(22)T1 | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.4XT | Vulnerable; first fixed in 12.4T | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | 12.4XV | Vulnerable; contact TAC | | |------------+--------------------------------------+---------------| | 12.4XW | 12.4(11)XW10 | 12.4(11)XW10 | |------------+--------------------------------------+---------------| | | | 12.4(22)T1 | | | | | | 12.4XY | 12.4(15)XY4 | 12.4(15)T9; | | | | Available on | | | | 29-APR-2009 | |------------+--------------------------------------+---------------| | 12.4XZ | 12.4(15)XZ1 | 12.4(15)XZ2 | |------------+--------------------------------------+---------------| | 12.4YA | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.4YB | Not Vulnerable | | |------------+--------------------------------------+---------------| | 12.4YD | Not Vulnerable | | +-------------------------------------------------------------------+
Workarounds
The following mitigation and identification methods have been identified for these vulnerabilities:
Infrastructure Access Control Lists +----------------------------------
Although it is often difficult to block traffic that transits a network, it is possible to identify traffic that should never be allowed to target infrastructure devices and block that traffic at the border of networks. Infrastructure Access Control Lists (iACLs) are a network security best practice and should be considered as a long-term addition to good network security as well as a workaround for these specific vulnerabilities. The iACL example below should be included as part of the deployed infrastructure access-list which will protect all devices with IP addresses in the infrastructure IP address range:
IPv4 example:
!--- Anti-spoofing entries are shown here.
!--- Deny special-use address sources.
!--- Refer to RFC 3330 for additional special use addresses.
access-list 110 deny ip host 0.0.0.0 any
access-list 110 deny ip 127.0.0.0 0.255.255.255 any
access-list 110 deny ip 192.0.2.0 0.0.0.255 any
access-list 110 deny ip 224.0.0.0 31.255.255.255 any
!--- Filter RFC 1918 space.
access-list 110 deny ip 10.0.0.0 0.255.255.255 any
access-list 110 deny ip 172.16.0.0 0.15.255.255 any
access-list 110 deny ip 192.168.0.0 0.0.255.255 any
!--- Deny your space as source from entering your AS.
!--- Deploy only at the AS edge.
access-list 110 deny ip YOUR_CIDR_BLOCK any
!--- Permit BGP.
access-list 110 permit tcp host bgp_peer host router_ip eq bgp
access-list 110 permit tcp host bgp_peer eq bgp host router_ip
!--- Deny access to internal infrastructure addresses.
access-list 110 deny ip any INTERNAL_INFRASTRUCTURE_ADDRESSES
!--- Permit transit traffic.
access-list 110 permit ip any any
IPv6 example:
!--- Configure the access-list.
ipv6 access-list iacl
!--- Deny your space as source from entering your AS.
!--- Deploy only at the AS edge.
deny ipv6 YOUR_CIDR_BLOCK_IPV6 any
!--- Permit multiprotocol BGP.
permit tcp host bgp_peer_ipv6 host router_ipv6 eq bgp
permit tcp host bgp_peer_ipv6 eq bgp host router_ipv6
!--- Deny access to internal infrastructure addresses.
deny ipv6 any INTERNAL_INFRASTRUCTURE_ADDRESSES_IPV6
!--- Permit transit traffic.
permit ipv6 any any
The white paper entitled "Protecting Your Core: Infrastructure Protection Access Control Lists" presents guidelines and recommended deployment techniques for infrastructure protection access lists. This white paper can be obtained at the following link http://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801a1a55.shtml
Cisco IOS Embedded Event Manager +-------------------------------
It is possible to detect blocked interface queues with a Cisco IOS Embedded Event Manager (EEM) policy. EEM provides event detection and reaction capabilities on a Cisco IOS device. EEM can alert administrators of blocked interfaces with email, a syslog message, or a Simple Network Management Protocol (SNMP) trap.
A sample EEM policy that uses syslog to alert administrators of blocked interfaces is available at Cisco Beyond, an online community dedicated to EEM. A sample script is available at the following link:
http://forums.cisco.com/eforum/servlet/EEM?page=eem&fn=script&scriptId=981
More information about EEM is available from Cisco.com at the following link: http://www.cisco.com/en/US/products/ps6815/products_ios_protocol_group_home.html
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 reported to Cisco by a customer.
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-20090325-mobileip.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 | 2009-Mar-25 | 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 v1.4.8 (Darwin)
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TITLE: Cisco IOS Multiple Vulnerabilities
SECUNIA ADVISORY ID: SA34438
VERIFY ADVISORY: http://secunia.com/advisories/34438/
DESCRIPTION: Some vulnerabilities have been reported in Cisco IOS, which can be exploited by malicious users to gain escalated privileges and by malicious people to cause a DoS (Denial of Service).
1) An unspecified error in the Cisco Tunneling Control Protocol (cTCP) feature can be exploited to exhaust all memory and may crash the cTCP server via a series of specially crafted TCP packets.
This vulnerability is reported in Cisco IOS versions 12.4(9)T or later, which are configured for Cisco Tunneling Control Protocol (cTCP) encapsulation (disabled by default) for EZVPN server.
2) An unspecified error exists in the handling of IP sockets, which can be exploited to prevent accepting new connections or sessions, exhaust memory, cause high CPU load, or to cause a reload of an affected device.
Successful exploitation of this vulnerability requires a complete TCP three-way handshake to an associated TCP port.
4) An unspecified error in the Cisco IOS SCP server (disabled by default) can be exploited to retrieve or write to arbitrary files on the device's file system, regardless of the CLI view configuration.
5) An unspecified error in the implementation of the Session Initiation Protocol (SIP) can be exploited to reload an affected device via a specially crafted SIP message.
This vulnerability is reported in Cisco IOS with SIP voice services enabled, and which process SIP messages as part of configured VoIP functionality.
6) An unspecified error in the handling of TCP packets can be exploited to reload an affected device via a sequence of specially crafted TCP packets.
Successful exploitation of this vulnerability requires a complete TCP three-way handshake to an associated TCP port.
This vulnerability is reported in Cisco IOS with the following features enabled: * Airline Product Set (ALPS) * Serial Tunnel Code (STUN) and Block Serial Tunnel Code (BSTUN) * Native Client Interface Architecture support (NCIA) * Data-link switching (DLSw) * Remote Source-Route Bridging (RSRB) * Point to Point Tunneling Protocol (PPTP) * X.25 for Record Boundary Preservation (RBP) * X.25 over TCP (XOT) * X.25 Routing
7) An unspecified error in the handling of UDP packets can be exploited to block an interface of an affected device by sending a specially crafted UDP packets.
SOLUTION: Please see the following vendor advisory for fixed versions. http://www.cisco.com/warp/public/707/cisco-sa-20090325-bundle.shtml
PROVIDED AND/OR DISCOVERED BY: 1, 3, 5 - 9) Reported by the vendor. 2) The vendor also credits Jens Link. 4) The vendor credits Kevin Graham.
ORIGINAL ADVISORY: Cisco: http://www.cisco.com/warp/public/707/cisco-sa-20090325-ctcp.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090325-ip.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090325-mobileip.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090325-scp.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090325-sip.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090325-tcp.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090325-udp.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090325-webvpn.shtml
OTHER REFERENCES: http://www.cisco.com/warp/public/707/cisco-amb-20090325-sip-and-udp.shtml http://www.cisco.com/warp/public/707/cisco-amb-20090325-ctcp.shtml
About: This Advisory was delivered by Secunia as a free service to help everybody keeping their systems up to date against the latest vulnerabilities.
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"data": "Multiple unspecified vulnerabilities in the home agent (HA) implementation in the (1) Mobile IP NAT Traversal feature and (2) Mobile IPv6 subsystem in Cisco IOS 12.3 through 12.4 allow remote attackers to cause a denial of service (input queue wedge and interface outage) via an ICMP packet, aka Bug ID CSCso05337. This vulnerability Bug ID : CSCso05337 Vulnerabilities. Cisco IOS is prone to multiple remote denial-of-service vulnerabilities. \nSuccessfully exploiting these issues allows remote attackers to crash the targeted device, denying service to legitimate users. \nThese issues are tracked by Cisco Bug IDs CSCsm97220 and CSCso05337. This vulnerability can only be successfully exploited when the attack packet must be explicitly sent to the router instead of an intermediate packet. \n\nCisco has released free software updates that address these\nvulnerabilities. \n\nThis advisory is posted at the following link \nhttp://www.cisco.com/warp/public/707/cisco-sa-20090325-mobileip.shtml\n\nNote: The March 25, 2009, Cisco IOS Security Advisory bundled\npublication includes eight Security Advisories. Each advisory lists\nthe releases that correct the vulnerability or vulnerabilities in the\nadvisory. The following table lists releases that correct all Cisco\nIOS Software vulnerabilities that have been published in Cisco\nSecurity Advisories on March 25, 2009, or earlier. 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 12.3(26) with an installed image name of\nC2500-IS-L:\n\n Router#show version\n Cisco Internetwork Operating System Software\n IOS (tm) 2500 Software (C2500-IS-L), Version 12.3(26), RELEASE SOFTWARE (fc2)\n Technical Support: http://www.cisco.com/techsupport\n Copyright (c) 1986-2008 by cisco Systems, Inc. \n Compiled Mon 17-Mar-08 14:39 by dchih\n !--- output truncated\n\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\nC1841-ADVENTERPRISEK9-M:\n\n Router#show version\n Cisco IOS Software, 1841 Software (C1841-ADVENTERPRISEK9-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 20:25 by prod_rel_team\n !--- output truncated\n\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\nCisco IOS XR is not affected by these vulnerabilities. \n\nNo other Cisco products are currently known to be affected by these\nvulnerabilities. \n\nDetails\n=======\n\nMobile IP is part of both IPv4 and IPv6 standards. Mobile IP allows a\nhost device to be identified by a single IP address even though the\ndevice may move its physical point of attachment from one network to\nanother. Regardless of movement between different networks,\nconnectivity at the different points is achieved seamlessly without\nuser intervention. Roaming from a wired network to a wireless or\nwide-area network is also possible. \n\nMore information on Mobile IPv6 can be found at the following link:\nhttp://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-mobile.html\n\nThe Mobile IP Support NAT Traversal feature is documented in RFC\n3519. It introduces an alternative method for tunneling Mobile IP\ndata traffic. New extensions in the Mobile IP registration request\nand reply messages have been added for establishing User Datagram\nProtocol (UDP) tunneling. This feature allows mobile devices in\ncollocated mode that use a private IP address (RFC 1918) or foreign\nagents (FAs) that use a private IP address for the care-of address\n(CoA) to establish a tunnel and traverse a NAT-enabled router with\nmobile node (MN) data traffic from the home agent (HA). A successful exploitation of this\nvulnerability could cause an interface to stop processing traffic\nuntil the system is restarted. Offending packets need to be destined\nto the router for a successful exploit. \n\nVulnerability Scoring Details\n=============================\n\nCisco has provided scores for the vulnerabilities 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\nCSCsm97220 - Input queue wedged by MIPv6 packets\n\nCVSS Base Score - 7.8\n\n Access Vector - Network\n Access Complexity - Low\n Authentication - None\n Confidentiality Impact - None\n Integrity Impact - None\n Availability Impact - Complete\n\nCVSS Temporal Score - 6.4\n\n Exploitability - Functional\n Remediation Level - Official-Fix\n Report Confidence - Confirmed\n\nCSCso05337 - HA: Input queue wedged by ICMP packet\n\nCVSS Base Score - 7.1\n\n Access Vector - Network\n Access Complexity - Medium\n Authentication - None\n Confidentiality Impact - None\n Integrity Impact - None\n Availability Impact - Complete\n\nCVSS Temporal Score - 5.9\n\n Exploitability\t - Functional\n Remediation Level - Official-Fix\n Report Confidence - Confirmed\n\nImpact\n======\n\nSuccessful exploitation of the vulnerability may result in an\ninterface to stop processing traffic, causing a DoS condition. \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 Cisco IOS software table (below) names a Cisco IOS\nrelease train. If a given release train is vulnerable, then the\nearliest possible releases that contain the fix (along with the\nanticipated date of availability for each, if applicable) are listed\nin the \"First Fixed Release\" column of the table. The \"Recommended\nRelease\" column indicates the releases which have fixes for all the\npublished vulnerabilities at the time of this Advisory. A device\nrunning a release in the given train that is earlier than the release\nin a specific column (less than the First Fixed Release) is known to\nbe vulnerable. Cisco recommends upgrading to a release equal to or\nlater than the release in the \"Recommended Releases\" column of the\ntable. \n\n+-------------------------------------------------------------------+\n| Major | Availability of Repaired Releases |\n| Release | |\n|------------+------------------------------------------------------|\n| Affected | | Recommended |\n| 12.0-Based | First Fixed Release | Release |\n| Releases | | |\n|-------------------------------------------------------------------|\n| There are no affected 12.0 based releases |\n|-------------------------------------------------------------------|\n| Affected | | Recommended |\n| 12.1-Based | First Fixed Release | Release |\n| Releases | | |\n|-------------------------------------------------------------------|\n| There are no affected 12.1 based releases |\n|-------------------------------------------------------------------|\n| Affected | | Recommended |\n| 12.2-Based | First Fixed Release | Release |\n| Releases | | |\n|-------------------------------------------------------------------|\n| There are no affected 12.2 based releases |\n|-------------------------------------------------------------------|\n| Affected | | Recommended |\n| 12.3-Based | First Fixed Release | Release |\n| Releases | | |\n|------------+--------------------------------------+---------------|\n| 12.3 | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3B | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3BC | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3BW | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3EU | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3JA | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3JEA | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3JEB | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3JEC | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3JK | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3JL | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3JX | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| | | 12.4(22)T1 |\n| | | |\n| 12.3T | Vulnerable; first fixed in 12.4T | 12.4(15)T9; |\n| | | Available on |\n| | | 29-APR-2009 |\n|------------+--------------------------------------+---------------|\n| 12.3TPC | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3VA | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3XA | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3XB | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3XC | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3XD | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3XE | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3XF | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3XG | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3XI | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3XJ | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3XK | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3XL | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3XQ | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3XR | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3XS | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3XU | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3XW | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3XX | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3XY | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3XZ | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3YA | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3YD | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3YF | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3YG | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3YH | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3YI | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3YJ | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| | Releases prior to 12.3(11)YK3 are | 12.4(22)T1 |\n| | vulnerable, release 12.3(11)YK3 and | |\n| 12.3YK | later are not vulnerable; first | 12.4(15)T9; |\n| | fixed in 12.4T | Available on |\n| | | 29-APR-2009 |\n|------------+--------------------------------------+---------------|\n| 12.3YM | 12.3(14)YM13 | 12.3(14)YM13 |\n|------------+--------------------------------------+---------------|\n| | | 12.4(22)T1 |\n| | | |\n| 12.3YQ | Vulnerable; first fixed in 12.4T | 12.4(15)T9; |\n| | | Available on |\n| | | 29-APR-2009 |\n|------------+--------------------------------------+---------------|\n| | | 12.4(22)T1 |\n| | | |\n| 12.3YS | Vulnerable; first fixed in 12.4T | 12.4(15)T9; |\n| | | Available on |\n| | | 29-APR-2009 |\n|------------+--------------------------------------+---------------|\n| | | 12.4(22)T1 |\n| | | |\n| 12.3YT | Vulnerable; first fixed in 12.4T | 12.4(15)T9; |\n| | | Available on |\n| | | 29-APR-2009 |\n|------------+--------------------------------------+---------------|\n| | | 12.4(22)T1 |\n| | | |\n| 12.3YU | Vulnerable; migrate to 12.4T | 12.4(15)T9; |\n| | | Available on |\n| | | 29-APR-2009 |\n|------------+--------------------------------------+---------------|\n| | Releases prior to 12.3(14)YX10 are | |\n| 12.3YX | vulnerable, release 12.3(14)YX10 and | 12.3(14)YX14 |\n| | later are not vulnerable; | |\n|------------+--------------------------------------+---------------|\n| 12.3YZ | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.3ZA | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| Affected | | Recommended |\n| 12.4-Based | First Fixed Release | Release |\n| Releases | | |\n|------------+--------------------------------------+---------------|\n| | | 12.4(18e) |\n| | 12.4(18e) | |\n| 12.4 | | 12.4(23a); |\n| | 12.4(23a); Available on 30-APR-2009 | Available on |\n| | | 30-APR-2009 |\n|------------+--------------------------------------+---------------|\n| 12.4JA | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.4JDA | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.4JK | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.4JL | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.4JMA | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.4JMB | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.4JX | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.4MD | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.4MR | 12.4(19)MR | 12.4(19)MR2 |\n|------------+--------------------------------------+---------------|\n| 12.4SW | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| | 12.4(20)T | 12.4(22)T1 |\n| | | |\n| 12.4T | 12.4(15)T8 | 12.4(15)T9; |\n| | | Available on |\n| | 12.4(15)T9; Available on 29-APR-2009 | 29-APR-2009 |\n|------------+--------------------------------------+---------------|\n| | | 12.4(22)T1 |\n| | | |\n| 12.4XA | Vulnerable; first fixed in 12.4T | 12.4(15)T9; |\n| | | Available on |\n| | | 29-APR-2009 |\n|------------+--------------------------------------+---------------|\n| | 12.4(15)T8 | 12.4(22)T1 |\n| | | |\n| 12.4XB | 12.4(20)T | 12.4(15)T9; |\n| | | Available on |\n| | 12.4(15)T9; Available on 29-APR-2009 | 29-APR-2009 |\n|------------+--------------------------------------+---------------|\n| | | 12.4(22)T1 |\n| | | |\n| 12.4XC | Vulnerable; first fixed in 12.4T | 12.4(15)T9; |\n| | | Available on |\n| | | 29-APR-2009 |\n|------------+--------------------------------------+---------------|\n| | 12.4(4)XD12; Available on | 12.4(4)XD12; |\n| 12.4XD | 27-MAR-2009 | Available on |\n| | | 27-MAR-2009 |\n|------------+--------------------------------------+---------------|\n| | | 12.4(22)T1 |\n| | | |\n| 12.4XE | Vulnerable; first fixed in 12.4T | 12.4(15)T9; |\n| | | Available on |\n| | | 29-APR-2009 |\n|------------+--------------------------------------+---------------|\n| | | 12.4(22)T1 |\n| | | |\n| 12.4XF | Vulnerable; first fixed in 12.4T | 12.4(15)T9; |\n| | | Available on |\n| | | 29-APR-2009 |\n|------------+--------------------------------------+---------------|\n| 12.4XG | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| | | 12.4(22)T1 |\n| | | |\n| 12.4XJ | Vulnerable; first fixed in 12.4T | 12.4(15)T9; |\n| | | Available on |\n| | | 29-APR-2009 |\n|------------+--------------------------------------+---------------|\n| 12.4XK | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.4XL | 12.4(15)XL4 | 12.4(15)XL4 |\n|------------+--------------------------------------+---------------|\n| | | 12.4(22)T1 |\n| | | |\n| 12.4XM | Vulnerable; first fixed in 12.4T | 12.4(15)T9; |\n| | | Available on |\n| | | 29-APR-2009 |\n|------------+--------------------------------------+---------------|\n| 12.4XN | Vulnerable; contact TAC | |\n|------------+--------------------------------------+---------------|\n| 12.4XP | Vulnerable; contact TAC | |\n|------------+--------------------------------------+---------------|\n| 12.4XQ | 12.4(15)XQ2 | 12.4(15)XQ2 |\n|------------+--------------------------------------+---------------|\n| 12.4XR | 12.4(15)XR4 | 12.4(22)T1 |\n|------------+--------------------------------------+---------------|\n| | | 12.4(22)T1 |\n| | | |\n| 12.4XT | Vulnerable; first fixed in 12.4T | 12.4(15)T9; |\n| | | Available on |\n| | | 29-APR-2009 |\n|------------+--------------------------------------+---------------|\n| 12.4XV | Vulnerable; contact TAC | |\n|------------+--------------------------------------+---------------|\n| 12.4XW | 12.4(11)XW10 | 12.4(11)XW10 |\n|------------+--------------------------------------+---------------|\n| | | 12.4(22)T1 |\n| | | |\n| 12.4XY | 12.4(15)XY4 | 12.4(15)T9; |\n| | | Available on |\n| | | 29-APR-2009 |\n|------------+--------------------------------------+---------------|\n| 12.4XZ | 12.4(15)XZ1 | 12.4(15)XZ2 |\n|------------+--------------------------------------+---------------|\n| 12.4YA | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.4YB | Not Vulnerable | |\n|------------+--------------------------------------+---------------|\n| 12.4YD | Not Vulnerable | |\n+-------------------------------------------------------------------+\n\nWorkarounds\n===========\n\nThe following mitigation and identification methods have been\nidentified for these vulnerabilities:\n\nInfrastructure Access Control Lists\n+----------------------------------\n\nAlthough it is often difficult to block traffic that transits a\nnetwork, it is possible to identify traffic that should never be\nallowed to target infrastructure devices and block that traffic at\nthe border of networks. Infrastructure Access Control Lists (iACLs)\nare a network security best practice and should be considered as a\nlong-term addition to good network security as well as a workaround\nfor these specific vulnerabilities. The iACL example below should be\nincluded as part of the deployed infrastructure access-list which\nwill protect all devices with IP addresses in the infrastructure IP\naddress range:\n\nIPv4 example:\n\n\n !--- Anti-spoofing entries are shown here. \n\n !--- Deny special-use address sources. \n !--- Refer to RFC 3330 for additional special use addresses. \n\n access-list 110 deny ip host 0.0.0.0 any\n access-list 110 deny ip 127.0.0.0 0.255.255.255 any\n access-list 110 deny ip 192.0.2.0 0.0.0.255 any\n access-list 110 deny ip 224.0.0.0 31.255.255.255 any\n\n !--- Filter RFC 1918 space. \n\n access-list 110 deny ip 10.0.0.0 0.255.255.255 any\n access-list 110 deny ip 172.16.0.0 0.15.255.255 any\n access-list 110 deny ip 192.168.0.0 0.0.255.255 any\n\n !--- Deny your space as source from entering your AS. \n !--- Deploy only at the AS edge. \n\n access-list 110 deny ip YOUR_CIDR_BLOCK any\n\n !--- Permit BGP. \n\n access-list 110 permit tcp host bgp_peer host router_ip eq bgp\n access-list 110 permit tcp host bgp_peer eq bgp host router_ip\n\n !--- Deny access to internal infrastructure addresses. \n\n access-list 110 deny ip any INTERNAL_INFRASTRUCTURE_ADDRESSES\n\n !--- Permit transit traffic. \n\n access-list 110 permit ip any any\n\nIPv6 example:\n\n\n !--- Configure the access-list. \n\n ipv6 access-list iacl\n\n !--- Deny your space as source from entering your AS. \n !--- Deploy only at the AS edge. \n\n deny ipv6 YOUR_CIDR_BLOCK_IPV6 any\n\n !--- Permit multiprotocol BGP. \n\n permit tcp host bgp_peer_ipv6 host router_ipv6 eq bgp\n permit tcp host bgp_peer_ipv6 eq bgp host router_ipv6\n\n !--- Deny access to internal infrastructure addresses. \n\n deny ipv6 any INTERNAL_INFRASTRUCTURE_ADDRESSES_IPV6\n\n !--- Permit transit traffic. \n\n permit ipv6 any any\n\nThe white paper entitled \"Protecting Your Core: Infrastructure\nProtection Access Control Lists\" presents guidelines and recommended\ndeployment techniques for infrastructure protection access lists. \nThis white paper can be obtained at the following link \nhttp://www.cisco.com/en/US/tech/tk648/tk361/technologies_white_paper09186a00801a1a55.shtml\n\nCisco IOS Embedded Event Manager\n+-------------------------------\n\nIt is possible to detect blocked interface queues with a Cisco IOS\nEmbedded Event Manager (EEM) policy. EEM provides event detection and\nreaction capabilities on a Cisco IOS device. EEM can alert\nadministrators of blocked interfaces with email, a syslog message, or\na Simple Network Management Protocol (SNMP) trap. \n\nA sample EEM policy that uses syslog to alert administrators of\nblocked interfaces is available at Cisco Beyond, an online community\ndedicated to EEM. A sample script is available at the following link:\n\nhttp://forums.cisco.com/eforum/servlet/EEM?page=eem\u0026fn=script\u0026scriptId=981\n\nMore information about EEM is available from Cisco.com at the\nfollowing link: \nhttp://www.cisco.com/en/US/products/ps6815/products_ios_protocol_group_home.html\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 http://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 reported to Cisco by a customer. \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-20090325-mobileip.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 | 2009-Mar-25 | 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 v1.4.8 (Darwin)\n\niEYEARECAAYFAknKUa8ACgkQ86n/Gc8U/uBD0ACfYblb5Nscx1zIWMLeihiaZAe7\nTtsAoIGgf8/ubiolVwSDmu/tCTgH8skm\n=YxAj\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. ----------------------------------------------------------------------\n\nSecunia is pleased to announce the release of the annual Secunia\nreport for 2008. \n\nHighlights from the 2008 report:\n * Vulnerability Research\n * Software Inspection Results\n * Secunia Research Highlights\n * Secunia Advisory Statistics\n\nRequest the full 2008 Report here:\nhttp://secunia.com/advisories/try_vi/request_2008_report/\n\nStay Secure,\n\nSecunia\n\n\n----------------------------------------------------------------------\n\nTITLE:\nCisco IOS Multiple Vulnerabilities\n\nSECUNIA ADVISORY ID:\nSA34438\n\nVERIFY ADVISORY:\nhttp://secunia.com/advisories/34438/\n\nDESCRIPTION:\nSome vulnerabilities have been reported in Cisco IOS, which can be\nexploited by malicious users to gain escalated privileges and by\nmalicious people to cause a DoS (Denial of Service). \n\n1) An unspecified error in the Cisco Tunneling Control Protocol\n(cTCP) feature can be exploited to exhaust all memory and may crash\nthe cTCP server via a series of specially crafted TCP packets. \n\nThis vulnerability is reported in Cisco IOS versions 12.4(9)T or\nlater, which are configured for Cisco Tunneling Control Protocol\n(cTCP) encapsulation (disabled by default) for EZVPN server. \n\n2) An unspecified error exists in the handling of IP sockets, which\ncan be exploited to prevent accepting new connections or sessions,\nexhaust memory, cause high CPU load, or to cause a reload of an\naffected device. \n\nSuccessful exploitation of this vulnerability requires a complete TCP\nthree-way handshake to an associated TCP port. \n\n4) An unspecified error in the Cisco IOS SCP server (disabled by\ndefault) can be exploited to retrieve or write to arbitrary files on\nthe device\u0027s file system, regardless of the CLI view configuration. \n\n5) An unspecified error in the implementation of the Session\nInitiation Protocol (SIP) can be exploited to reload an affected\ndevice via a specially crafted SIP message. \n\nThis vulnerability is reported in Cisco IOS with SIP voice services\nenabled, and which process SIP messages as part of configured VoIP\nfunctionality. \n\n6) An unspecified error in the handling of TCP packets can be\nexploited to reload an affected device via a sequence of specially\ncrafted TCP packets. \n\nSuccessful exploitation of this vulnerability requires a complete TCP\nthree-way handshake to an associated TCP port. \n\nThis vulnerability is reported in Cisco IOS with the following\nfeatures enabled:\n* Airline Product Set (ALPS)\n* Serial Tunnel Code (STUN) and Block Serial Tunnel Code (BSTUN)\n* Native Client Interface Architecture support (NCIA)\n* Data-link switching (DLSw)\n* Remote Source-Route Bridging (RSRB)\n* Point to Point Tunneling Protocol (PPTP)\n* X.25 for Record Boundary Preservation (RBP)\n* X.25 over TCP (XOT)\n* X.25 Routing\n\n7) An unspecified error in the handling of UDP packets can be\nexploited to block an interface of an affected device by sending a\nspecially crafted UDP packets. \n\nSOLUTION:\nPlease see the following vendor advisory for fixed versions. \nhttp://www.cisco.com/warp/public/707/cisco-sa-20090325-bundle.shtml\n\nPROVIDED AND/OR DISCOVERED BY:\n1, 3, 5 - 9) Reported by the vendor. \n2) The vendor also credits Jens Link. \n4) The vendor credits Kevin Graham. \n\nORIGINAL ADVISORY:\nCisco:\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090325-ctcp.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090325-ip.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090325-mobileip.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090325-scp.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090325-sip.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090325-tcp.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090325-udp.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090325-webvpn.shtml\n\nOTHER REFERENCES:\nhttp://www.cisco.com/warp/public/707/cisco-amb-20090325-sip-and-udp.shtml\nhttp://www.cisco.com/warp/public/707/cisco-amb-20090325-ctcp.shtml\n\n----------------------------------------------------------------------\n\nAbout:\nThis Advisory was delivered by Secunia as a free service to help\neverybody 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",
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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.
- 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.