fkie_cve-2015-5600
Vulnerability from fkie_nvd
Published
2015-08-03 01:59
Modified
2025-04-12 10:46
Severity ?
Summary
The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processing of keyboard-interactive devices within a single connection, which makes it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list.
References
cve@mitre.orghttp://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c
cve@mitre.orghttp://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c.diff?r1=1.42&r2=1.43&f=h
cve@mitre.orghttp://kb.juniper.net/InfoCenter/index?page=content&id=JSA10697
cve@mitre.orghttp://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html
cve@mitre.orghttp://lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html
cve@mitre.orghttp://lists.fedoraproject.org/pipermail/package-announce/2015-July/162955.html
cve@mitre.orghttp://lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html
cve@mitre.orghttp://openwall.com/lists/oss-security/2015/07/23/4
cve@mitre.orghttp://rhn.redhat.com/errata/RHSA-2016-0466.html
cve@mitre.orghttp://seclists.org/fulldisclosure/2015/Jul/92Exploit
cve@mitre.orghttp://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
cve@mitre.orghttp://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
cve@mitre.orghttp://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
cve@mitre.orghttp://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
cve@mitre.orghttp://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
cve@mitre.orghttp://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
cve@mitre.orghttp://www.securityfocus.com/bid/75990
cve@mitre.orghttp://www.securityfocus.com/bid/91787
cve@mitre.orghttp://www.securityfocus.com/bid/92012
cve@mitre.orghttp://www.securitytracker.com/id/1032988
cve@mitre.orghttp://www.ubuntu.com/usn/USN-2710-1
cve@mitre.orghttp://www.ubuntu.com/usn/USN-2710-2
cve@mitre.orghttps://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
cve@mitre.orghttps://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04952480
cve@mitre.orghttps://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05128992
cve@mitre.orghttps://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05157667
cve@mitre.orghttps://kc.mcafee.com/corporate/index?page=content&id=SB10136
cve@mitre.orghttps://kc.mcafee.com/corporate/index?page=content&id=SB10157
cve@mitre.orghttps://lists.debian.org/debian-lts-announce/2018/09/msg00010.html
cve@mitre.orghttps://security.gentoo.org/glsa/201512-04
cve@mitre.orghttps://security.netapp.com/advisory/ntap-20151106-0001/
cve@mitre.orghttps://support.apple.com/kb/HT205031
cve@mitre.orghttps://www.arista.com/en/support/advisories-notices/security-advisories/1174-security-advisory-12
af854a3a-2127-422b-91ae-364da2661108http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c
af854a3a-2127-422b-91ae-364da2661108http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c.diff?r1=1.42&r2=1.43&f=h
af854a3a-2127-422b-91ae-364da2661108http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10697
af854a3a-2127-422b-91ae-364da2661108http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html
af854a3a-2127-422b-91ae-364da2661108http://lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html
af854a3a-2127-422b-91ae-364da2661108http://lists.fedoraproject.org/pipermail/package-announce/2015-July/162955.html
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html
af854a3a-2127-422b-91ae-364da2661108http://openwall.com/lists/oss-security/2015/07/23/4
af854a3a-2127-422b-91ae-364da2661108http://rhn.redhat.com/errata/RHSA-2016-0466.html
af854a3a-2127-422b-91ae-364da2661108http://seclists.org/fulldisclosure/2015/Jul/92Exploit
af854a3a-2127-422b-91ae-364da2661108http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html
af854a3a-2127-422b-91ae-364da2661108http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
af854a3a-2127-422b-91ae-364da2661108http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html
af854a3a-2127-422b-91ae-364da2661108http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
af854a3a-2127-422b-91ae-364da2661108http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
af854a3a-2127-422b-91ae-364da2661108http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/75990
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/91787
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/92012
af854a3a-2127-422b-91ae-364da2661108http://www.securitytracker.com/id/1032988
af854a3a-2127-422b-91ae-364da2661108http://www.ubuntu.com/usn/USN-2710-1
af854a3a-2127-422b-91ae-364da2661108http://www.ubuntu.com/usn/USN-2710-2
af854a3a-2127-422b-91ae-364da2661108https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
af854a3a-2127-422b-91ae-364da2661108https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04952480
af854a3a-2127-422b-91ae-364da2661108https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05128992
af854a3a-2127-422b-91ae-364da2661108https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05157667
af854a3a-2127-422b-91ae-364da2661108https://kc.mcafee.com/corporate/index?page=content&id=SB10136
af854a3a-2127-422b-91ae-364da2661108https://kc.mcafee.com/corporate/index?page=content&id=SB10157
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/201512-04
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20151106-0001/
af854a3a-2127-422b-91ae-364da2661108https://support.apple.com/kb/HT205031
af854a3a-2127-422b-91ae-364da2661108https://www.arista.com/en/support/advisories-notices/security-advisories/1174-security-advisory-12
Impacted products
Vendor Product Version
openbsd openssh *


To clipboard 

{
   configurations: [
      {
         nodes: [
            {
               cpeMatch: [
                  {
                     criteria: "cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*",
                     matchCriteriaId: "27C9A807-7740-4D75-9B01-91ED53D14C40",
                     versionEndIncluding: "6.9",
                     vulnerable: true,
                  },
               ],
               negate: false,
               operator: "OR",
            },
         ],
      },
   ],
   cveTags: [],
   descriptions: [
      {
         lang: "en",
         value: "The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processing of keyboard-interactive devices within a single connection, which makes it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list.",
      },
      {
         lang: "es",
         value: "Vulnerabilidad en la función kbdint_next_device en auth2-chall.c en sshd en OpenSSH hasta la versión 6.9, no restringe correctamente el procesamiento de dispositivos de teclado interactivo con una única conexión, lo cual facilita a atacantes remotos ejecutar un ataque de fuerza bruta o causar una denegación de servicio (mediante el consumo de la CPU) a través de una lista larga y redundante en la opción ssh -oKbdInteractiveDevices, según lo demostrado por una modificación en el cliente que provee una contraseña diferente para cada uno de los elementos pam de la lista.",
      },
   ],
   id: "CVE-2015-5600",
   lastModified: "2025-04-12T10:46:40.837",
   metrics: {
      cvssMetricV2: [
         {
            acInsufInfo: false,
            baseSeverity: "HIGH",
            cvssData: {
               accessComplexity: "LOW",
               accessVector: "NETWORK",
               authentication: "NONE",
               availabilityImpact: "COMPLETE",
               baseScore: 8.5,
               confidentialityImpact: "PARTIAL",
               integrityImpact: "NONE",
               vectorString: "AV:N/AC:L/Au:N/C:P/I:N/A:C",
               version: "2.0",
            },
            exploitabilityScore: 10,
            impactScore: 7.8,
            obtainAllPrivilege: false,
            obtainOtherPrivilege: false,
            obtainUserPrivilege: false,
            source: "nvd@nist.gov",
            type: "Primary",
            userInteractionRequired: false,
         },
      ],
   },
   published: "2015-08-03T01:59:03.950",
   references: [
      {
         source: "cve@mitre.org",
         url: "http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c",
      },
      {
         source: "cve@mitre.org",
         url: "http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c.diff?r1=1.42&r2=1.43&f=h",
      },
      {
         source: "cve@mitre.org",
         url: "http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10697",
      },
      {
         source: "cve@mitre.org",
         url: "http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html",
      },
      {
         source: "cve@mitre.org",
         url: "http://lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html",
      },
      {
         source: "cve@mitre.org",
         url: "http://lists.fedoraproject.org/pipermail/package-announce/2015-July/162955.html",
      },
      {
         source: "cve@mitre.org",
         url: "http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html",
      },
      {
         source: "cve@mitre.org",
         url: "http://openwall.com/lists/oss-security/2015/07/23/4",
      },
      {
         source: "cve@mitre.org",
         url: "http://rhn.redhat.com/errata/RHSA-2016-0466.html",
      },
      {
         source: "cve@mitre.org",
         tags: [
            "Exploit",
         ],
         url: "http://seclists.org/fulldisclosure/2015/Jul/92",
      },
      {
         source: "cve@mitre.org",
         url: "http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html",
      },
      {
         source: "cve@mitre.org",
         url: "http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html",
      },
      {
         source: "cve@mitre.org",
         url: "http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html",
      },
      {
         source: "cve@mitre.org",
         url: "http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html",
      },
      {
         source: "cve@mitre.org",
         url: "http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html",
      },
      {
         source: "cve@mitre.org",
         url: "http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html",
      },
      {
         source: "cve@mitre.org",
         url: "http://www.securityfocus.com/bid/75990",
      },
      {
         source: "cve@mitre.org",
         url: "http://www.securityfocus.com/bid/91787",
      },
      {
         source: "cve@mitre.org",
         url: "http://www.securityfocus.com/bid/92012",
      },
      {
         source: "cve@mitre.org",
         url: "http://www.securitytracker.com/id/1032988",
      },
      {
         source: "cve@mitre.org",
         url: "http://www.ubuntu.com/usn/USN-2710-1",
      },
      {
         source: "cve@mitre.org",
         url: "http://www.ubuntu.com/usn/USN-2710-2",
      },
      {
         source: "cve@mitre.org",
         url: "https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf",
      },
      {
         source: "cve@mitre.org",
         url: "https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04952480",
      },
      {
         source: "cve@mitre.org",
         url: "https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05128992",
      },
      {
         source: "cve@mitre.org",
         url: "https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05157667",
      },
      {
         source: "cve@mitre.org",
         url: "https://kc.mcafee.com/corporate/index?page=content&id=SB10136",
      },
      {
         source: "cve@mitre.org",
         url: "https://kc.mcafee.com/corporate/index?page=content&id=SB10157",
      },
      {
         source: "cve@mitre.org",
         url: "https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html",
      },
      {
         source: "cve@mitre.org",
         url: "https://security.gentoo.org/glsa/201512-04",
      },
      {
         source: "cve@mitre.org",
         url: "https://security.netapp.com/advisory/ntap-20151106-0001/",
      },
      {
         source: "cve@mitre.org",
         url: "https://support.apple.com/kb/HT205031",
      },
      {
         source: "cve@mitre.org",
         url: "https://www.arista.com/en/support/advisories-notices/security-advisories/1174-security-advisory-12",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c.diff?r1=1.42&r2=1.43&f=h",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10697",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "http://lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "http://lists.fedoraproject.org/pipermail/package-announce/2015-July/162955.html",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "http://openwall.com/lists/oss-security/2015/07/23/4",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "http://rhn.redhat.com/errata/RHSA-2016-0466.html",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         tags: [
            "Exploit",
         ],
         url: "http://seclists.org/fulldisclosure/2015/Jul/92",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "http://www.securityfocus.com/bid/75990",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "http://www.securityfocus.com/bid/91787",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "http://www.securityfocus.com/bid/92012",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "http://www.securitytracker.com/id/1032988",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "http://www.ubuntu.com/usn/USN-2710-1",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "http://www.ubuntu.com/usn/USN-2710-2",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04952480",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05128992",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05157667",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "https://kc.mcafee.com/corporate/index?page=content&id=SB10136",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "https://kc.mcafee.com/corporate/index?page=content&id=SB10157",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "https://security.gentoo.org/glsa/201512-04",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "https://security.netapp.com/advisory/ntap-20151106-0001/",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "https://support.apple.com/kb/HT205031",
      },
      {
         source: "af854a3a-2127-422b-91ae-364da2661108",
         url: "https://www.arista.com/en/support/advisories-notices/security-advisories/1174-security-advisory-12",
      },
   ],
   sourceIdentifier: "cve@mitre.org",
   vulnStatus: "Deferred",
   weaknesses: [
      {
         description: [
            {
               lang: "en",
               value: "CWE-264",
            },
         ],
         source: "nvd@nist.gov",
         type: "Primary",
      },
   ],
}


Log in or create an account to share your comment.

Security Advisory comment format.

This schema specifies the format of a comment related to a security advisory.

UUIDv4 of the comment
UUIDv4 of the Vulnerability-Lookup instance
When the comment was created originally
When the comment was last updated
Title of the comment
Description of the comment
The identifier of the vulnerability (CVE ID, GHSA-ID, PYSEC ID, etc.).



Tags
Taxonomy of the tags.




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.