fkie_cve-2016-8858
Vulnerability from fkie_nvd
Published
2016-12-09 11:59
Modified
2025-04-12 10:46
Summary
The kex_input_kexinit function in kex.c in OpenSSH 6.x and 7.x through 7.3 allows remote attackers to cause a denial of service (memory consumption) by sending many duplicate KEXINIT requests. NOTE: a third party reports that "OpenSSH upstream does not consider this as a security issue."
References
cve@mitre.orghttp://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c.diff?r1=1.126&r2=1.127&f=hIssue Tracking, Vendor Advisory
cve@mitre.orghttp://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c?rev=1.127&content-type=text/x-cvsweb-markupIssue Tracking, Vendor Advisory
cve@mitre.orghttp://www.openwall.com/lists/oss-security/2016/10/19/3Mailing List, Third Party Advisory
cve@mitre.orghttp://www.openwall.com/lists/oss-security/2016/10/20/1Mailing List, Third Party Advisory
cve@mitre.orghttp://www.securityfocus.com/bid/93776Third Party Advisory, VDB Entry
cve@mitre.orghttp://www.securitytracker.com/id/1037057Third Party Advisory, VDB Entry
cve@mitre.orghttps://bugzilla.redhat.com/show_bug.cgi?id=1384860Issue Tracking
cve@mitre.orghttps://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
cve@mitre.orghttps://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.sigPatch, Vendor Advisory
cve@mitre.orghttps://github.com/openssh/openssh-portable/commit/ec165c392ca54317dbe3064a8c200de6531e89adIssue Tracking, Patch, Third Party Advisory
cve@mitre.orghttps://security.FreeBSD.org/advisories/FreeBSD-SA-16:33.openssh.ascThird Party Advisory
cve@mitre.orghttps://security.gentoo.org/glsa/201612-18Third Party Advisory
cve@mitre.orghttps://security.netapp.com/advisory/ntap-20180201-0001/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c.diff?r1=1.126&r2=1.127&f=hIssue Tracking, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c?rev=1.127&content-type=text/x-cvsweb-markupIssue Tracking, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2016/10/19/3Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2016/10/20/1Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/93776Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108http://www.securitytracker.com/id/1037057Third Party Advisory, VDB Entry
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=1384860Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
af854a3a-2127-422b-91ae-364da2661108https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.sigPatch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/openssh/openssh-portable/commit/ec165c392ca54317dbe3064a8c200de6531e89adIssue Tracking, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.FreeBSD.org/advisories/FreeBSD-SA-16:33.openssh.ascThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/201612-18Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20180201-0001/Third Party Advisory
Impacted products
Vendor Product Version
openbsd openssh 6.8
openbsd openssh 6.9
openbsd openssh 7.0
openbsd openssh 7.1
openbsd openssh 7.2
openbsd openssh 7.3



{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:openbsd:openssh:6.8:*:*:*:*:*:*:*",
              "matchCriteriaId": "65A8629A-CFAE-4403-BEE7-622912483702",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openbsd:openssh:6.9:*:*:*:*:*:*:*",
              "matchCriteriaId": "D0607649-62FE-41CB-9444-53CD9C5B67C0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openbsd:openssh:7.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "0B0FB8D5-75CB-4691-AB9F-B4FA46973421",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openbsd:openssh:7.1:*:*:*:*:*:*:*",
              "matchCriteriaId": "67E1B240-BD86-41D3-BAC1-96005CB31DEE",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openbsd:openssh:7.2:*:*:*:*:*:*:*",
              "matchCriteriaId": "2FC2BA97-6E7A-4AEF-8944-DB3AB8E14762",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openbsd:openssh:7.3:*:*:*:*:*:*:*",
              "matchCriteriaId": "F5D3A31E-D785-406D-A8C8-FD122F4C9E38",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [
    {
      "sourceIdentifier": "cve@mitre.org",
      "tags": [
        "disputed"
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "The kex_input_kexinit function in kex.c in OpenSSH 6.x and 7.x through 7.3 allows remote attackers to cause a denial of service (memory consumption) by sending many duplicate KEXINIT requests.  NOTE: a third party reports that \"OpenSSH upstream does not consider this as a security issue.\""
    },
    {
      "lang": "es",
      "value": "** DISPUTADA ** La funci\u00f3n kex_input_kexinit en kex.c en OpenSSH 6.x y 7.x hasta la versi\u00f3n 7.3 permite a atacantes remotos provocar una denegaci\u00f3n de servicio (consumo de memoria) enviando muchas peticiones duplicadas KEXINIT. NOTA: un tercero reporta que \"OpenSSH upstream no considera esto como un problema de seguridad\"."
    }
  ],
  "id": "CVE-2016-8858",
  "lastModified": "2025-04-12T10:46:40.837",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "HIGH",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "COMPLETE",
          "baseScore": 7.8,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:C",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 6.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.0"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2016-12-09T11:59:00.207",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Issue Tracking",
        "Vendor Advisory"
      ],
      "url": "http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c.diff?r1=1.126\u0026r2=1.127\u0026f=h"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Issue Tracking",
        "Vendor Advisory"
      ],
      "url": "http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c?rev=1.127\u0026content-type=text/x-cvsweb-markup"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://www.openwall.com/lists/oss-security/2016/10/19/3"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://www.openwall.com/lists/oss-security/2016/10/20/1"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "url": "http://www.securityfocus.com/bid/93776"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "url": "http://www.securitytracker.com/id/1037057"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Issue Tracking"
      ],
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1384860"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.sig"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Issue Tracking",
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/openssh/openssh-portable/commit/ec165c392ca54317dbe3064a8c200de6531e89ad"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-16:33.openssh.asc"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://security.gentoo.org/glsa/201612-18"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://security.netapp.com/advisory/ntap-20180201-0001/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Issue Tracking",
        "Vendor Advisory"
      ],
      "url": "http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c.diff?r1=1.126\u0026r2=1.127\u0026f=h"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Issue Tracking",
        "Vendor Advisory"
      ],
      "url": "http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c?rev=1.127\u0026content-type=text/x-cvsweb-markup"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://www.openwall.com/lists/oss-security/2016/10/19/3"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "http://www.openwall.com/lists/oss-security/2016/10/20/1"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "url": "http://www.securityfocus.com/bid/93776"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory",
        "VDB Entry"
      ],
      "url": "http://www.securitytracker.com/id/1037057"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Issue Tracking"
      ],
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1384860"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.sig"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Issue Tracking",
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/openssh/openssh-portable/commit/ec165c392ca54317dbe3064a8c200de6531e89ad"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://security.FreeBSD.org/advisories/FreeBSD-SA-16:33.openssh.asc"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://security.gentoo.org/glsa/201612-18"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://security.netapp.com/advisory/ntap-20180201-0001/"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-399"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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