FKIE_CVE-2016-3120

Vulnerability from fkie_nvd - Published: 2016-08-01 02:59 - Updated: 2026-06-17 00:45
Severity
6.5 (Medium) - CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
The validate_as_request function in kdc_util.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.13.6 and 1.4.x before 1.14.3, when restrict_anonymous_to_tgt is enabled, uses an incorrect client data structure, which allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) via an S4U2Self request.
References
cve@mitre.orghttp://krbdev.mit.edu/rt/Ticket/Display.html?id=8458Issue Tracking
cve@mitre.orghttp://lists.opensuse.org/opensuse-updates/2016-09/msg00035.html
cve@mitre.orghttp://rhn.redhat.com/errata/RHSA-2016-2591.html
cve@mitre.orghttp://web.mit.edu/kerberos/krb5-1.13/
cve@mitre.orghttp://web.mit.edu/kerberos/krb5-1.14/
cve@mitre.orghttp://www.securityfocus.com/bid/92132
cve@mitre.orghttp://www.securitytracker.com/id/1036442
cve@mitre.orghttps://github.com/krb5/krb5/commit/93b4a6306a0026cf1cc31ac4bd8a49ba5d034ba7
cve@mitre.orghttps://lists.debian.org/debian-lts-announce/2018/01/msg00040.html
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AWL3KYFRJIX37EAM4DKCQQIQP2WBKL35/
af854a3a-2127-422b-91ae-364da2661108http://krbdev.mit.edu/rt/Ticket/Display.html?id=8458Issue Tracking
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-updates/2016-09/msg00035.html
af854a3a-2127-422b-91ae-364da2661108http://rhn.redhat.com/errata/RHSA-2016-2591.html
af854a3a-2127-422b-91ae-364da2661108http://web.mit.edu/kerberos/krb5-1.13/
af854a3a-2127-422b-91ae-364da2661108http://web.mit.edu/kerberos/krb5-1.14/
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/bid/92132
af854a3a-2127-422b-91ae-364da2661108http://www.securitytracker.com/id/1036442
af854a3a-2127-422b-91ae-364da2661108https://github.com/krb5/krb5/commit/93b4a6306a0026cf1cc31ac4bd8a49ba5d034ba7
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2018/01/msg00040.html
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AWL3KYFRJIX37EAM4DKCQQIQP2WBKL35/
Impacted products
Vendor Product Version
mit kerberos_5 1.13
mit kerberos_5 1.13.1
mit kerberos_5 1.13.2
mit kerberos_5 1.13.3
mit kerberos_5 1.13.4
mit kerberos_5 1.13.5
mit kerberos_5 1.13.6
mit kerberos_5 1.14
mit kerberos_5 1.14.1
mit kerberos_5 1.14.2
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:mit:kerberos_5:1.13:*:*:*:*:*:*:*",
              "matchCriteriaId": "169D00BD-344F-453C-BE7C-9DF0740080BB",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:mit:kerberos_5:1.13.1:*:*:*:*:*:*:*",
              "matchCriteriaId": "765B3248-A524-4A79-858C-E787C1C1599E",
              "vulnerable": true
            },
            {
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              "matchCriteriaId": "BF1BB0AB-2C22-49F9-9D2A-074D2F711BA8",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:mit:kerberos_5:1.13.3:*:*:*:*:*:*:*",
              "matchCriteriaId": "C8EC001E-9507-410D-836F-93002789D574",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:mit:kerberos_5:1.13.4:*:*:*:*:*:*:*",
              "matchCriteriaId": "CC0939BF-9ACB-41A7-9B48-0FBF1176C8CB",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:mit:kerberos_5:1.13.5:*:*:*:*:*:*:*",
              "matchCriteriaId": "0037EF80-A599-4938-889F-9276E339A8E0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:mit:kerberos_5:1.13.6:*:*:*:*:*:*:*",
              "matchCriteriaId": "1CABFE58-4811-49EC-8565-35EB7D5F6F4C",
              "vulnerable": true
            },
            {
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              "matchCriteriaId": "6E30B176-1FE5-4C53-8B79-2E6D87DF05B3",
              "vulnerable": true
            },
            {
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              "matchCriteriaId": "E650B5A3-99CA-491B-A1FB-259EF548D92E",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:mit:kerberos_5:1.14.2:*:*:*:*:*:*:*",
              "matchCriteriaId": "091F3C51-980E-482F-9882-0A555A8F74BC",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The validate_as_request function in kdc_util.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.13.6 and 1.4.x before 1.14.3, when restrict_anonymous_to_tgt is enabled, uses an incorrect client data structure, which allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) via an S4U2Self request."
    },
    {
      "lang": "es",
      "value": "La funci\u00f3n validate_as_request en kdc_util.c en el Key Distribution Center (KDC) en MIT Kerberos 5 (tambi\u00e9n conocido como krb5) en versiones anteriores a 1.13.6 y 1.4.x en versiones anteriores a 1.14.3, cuando restrict_anonymous_to_tgt est\u00e1 activo, utiliza una estructura de datos de clientes incorrecta, lo que permite a usuarios remotos autenticados provocar una denegaci\u00f3n de servicio (referencia al puntero NULO y ca\u00edda de daemon) a trav\u00e9s de una petici\u00f3n S4U2Selft."
    }
  ],
  "id": "CVE-2016-3120",
  "lastModified": "2026-06-17T00:45:00.557",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "SINGLE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 4.0,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:S/C:N/I:N/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 8.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.0"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2016-08-01T02:59:12.370",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Issue Tracking"
      ],
      "url": "http://krbdev.mit.edu/rt/Ticket/Display.html?id=8458"
    },
    {
      "source": "cve@mitre.org",
      "url": "http://lists.opensuse.org/opensuse-updates/2016-09/msg00035.html"
    },
    {
      "source": "cve@mitre.org",
      "url": "http://rhn.redhat.com/errata/RHSA-2016-2591.html"
    },
    {
      "source": "cve@mitre.org",
      "url": "http://web.mit.edu/kerberos/krb5-1.13/"
    },
    {
      "source": "cve@mitre.org",
      "url": "http://web.mit.edu/kerberos/krb5-1.14/"
    },
    {
      "source": "cve@mitre.org",
      "url": "http://www.securityfocus.com/bid/92132"
    },
    {
      "source": "cve@mitre.org",
      "url": "http://www.securitytracker.com/id/1036442"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://github.com/krb5/krb5/commit/93b4a6306a0026cf1cc31ac4bd8a49ba5d034ba7"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://lists.debian.org/debian-lts-announce/2018/01/msg00040.html"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AWL3KYFRJIX37EAM4DKCQQIQP2WBKL35/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Issue Tracking"
      ],
      "url": "http://krbdev.mit.edu/rt/Ticket/Display.html?id=8458"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
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    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://rhn.redhat.com/errata/RHSA-2016-2591.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://web.mit.edu/kerberos/krb5-1.13/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://web.mit.edu/kerberos/krb5-1.14/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.securityfocus.com/bid/92132"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.securitytracker.com/id/1036442"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://github.com/krb5/krb5/commit/93b4a6306a0026cf1cc31ac4bd8a49ba5d034ba7"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.debian.org/debian-lts-announce/2018/01/msg00040.html"
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AWL3KYFRJIX37EAM4DKCQQIQP2WBKL35/"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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