CVE-2015-5600 (GCVE-0-2015-5600)

Vulnerability from cvelistv5 – Published: 2015-08-03 00:00 – Updated: 2024-08-06 06:50
VLAI?
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.
Severity ?
No CVSS data available.
CWE
  • n/a
Assigner
References
http://www.oracle.com/technetwork/topics/security…
http://www.ubuntu.com/usn/USN-2710-2 vendor-advisory
http://lists.fedoraproject.org/pipermail/package-… vendor-advisory
http://www.oracle.com/technetwork/security-adviso…
https://h20566.www2.hpe.com/portal/site/hpsc/publ…
https://h20566.www2.hpe.com/portal/site/hpsc/publ…
http://www.oracle.com/technetwork/topics/security…
http://www.oracle.com/technetwork/security-adviso…
https://security.gentoo.org/glsa/201512-04 vendor-advisory
https://kc.mcafee.com/corporate/index?page=conten…
https://security.netapp.com/advisory/ntap-2015110…
http://rhn.redhat.com/errata/RHSA-2016-0466.html vendor-advisory
http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.…
http://www.oracle.com/technetwork/topics/security…
http://kb.juniper.net/InfoCenter/index?page=conte…
http://lists.apple.com/archives/security-announce… vendor-advisory
http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.…
https://kc.mcafee.com/corporate/index?page=conten…
http://www.securityfocus.com/bid/75990 vdb-entry
http://www.securityfocus.com/bid/91787 vdb-entry
https://h20564.www2.hpe.com/portal/site/hpsc/publ…
http://lists.opensuse.org/opensuse-security-annou… vendor-advisory
http://www.securityfocus.com/bid/92012 vdb-entry
https://support.apple.com/kb/HT205031
https://lists.debian.org/debian-lts-announce/2018… mailing-list
http://openwall.com/lists/oss-security/2015/07/23/4 mailing-list
http://www.ubuntu.com/usn/USN-2710-1 vendor-advisory
http://lists.fedoraproject.org/pipermail/package-… vendor-advisory
http://www.securitytracker.com/id/1032988 vdb-entry
http://seclists.org/fulldisclosure/2015/Jul/92 mailing-list
http://www.oracle.com/technetwork/topics/security…
https://www.arista.com/en/support/advisories-noti…
https://cert-portal.siemens.com/productcert/pdf/s…
Show details on NVD website

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      "sourceIdentifier": "cve@mitre.org",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-264\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2015-5600\",\"sourceIdentifier\":\"cve@mitre.org\",\"published\":\"2015-08-03T01:59:03.950\",\"lastModified\":\"2025-04-12T10:46:40.837\",\"vulnStatus\":\"Deferred\",\"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 funci\u00f3n kbdint_next_device en auth2-chall.c en sshd en OpenSSH hasta la versi\u00f3n 6.9, no restringe correctamente el procesamiento de dispositivos de teclado interactivo con una \u00fanica conexi\u00f3n, lo cual facilita a atacantes remotos ejecutar un ataque de fuerza bruta o causar una denegaci\u00f3n de servicio (mediante el consumo de la CPU) a trav\u00e9s de una lista larga y redundante en la opci\u00f3n ssh -oKbdInteractiveDevices, seg\u00fan lo demostrado por una modificaci\u00f3n en el cliente que provee una contrase\u00f1a diferente para cada uno de los elementos pam de la lista.\"}],\"metrics\":{\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:L/Au:N/C:P/I:N/A:C\",\"baseScore\":8.5,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"COMPLETE\"},\"baseSeverity\":\"HIGH\",\"exploitabilityScore\":10.0,\"impactScore\":7.8,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-264\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*\",\"versionEndIncluding\":\"6.9\",\"matchCriteriaId\":\"27C9A807-7740-4D75-9B01-91ED53D14C40\"}]}]}],\"references\":[{\"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\u0026r2=1.43\u0026f=h\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://kb.juniper.net/InfoCenter/index?page=content\u0026id=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\"},{\"url\":\"http://seclists.org/fulldisclosure/2015/Jul/92\",\"source\":\"cve@mitre.org\",\"tags\":[\"Exploit\"]},{\"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\u0026id=SB10136\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://kc.mcafee.com/corporate/index?page=content\u0026id=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\":\"cve@mitre.org\"},{\"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\u0026r2=1.43\u0026f=h\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"http://kb.juniper.net/InfoCenter/index?pa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  }
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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