CVE-2016-3120 (GCVE-0-2016-3120)

Vulnerability from cvelistv5 – Published: 2016-08-01 01:00 – Updated: 2024-08-05 23:47
VLAI
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.
Severity
6.5 (Medium)
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • n/a
Assigner
References
Date Public
2016-07-20 00:00
Show details on NVD website
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                    "criteria": "cpe:2.3:a:mit:kerberos_5:1.14:*:*:*:*:*:*:*",
                    "matchCriteriaId": "6E30B176-1FE5-4C53-8B79-2E6D87DF05B3",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:a:mit:kerberos_5:1.14.1:*:*:*:*:*:*:*",
                    "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": "2026-05-06T22:30:45.220",
        "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",
            "url": "http://lists.opensuse.org/opensuse-updates/2016-09/msg00035.html"
          },
          {
            "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"
          },
          {
            "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"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-04T23:15:51+00:00",
      "cve": "CVE-2016-3120",
      "id": "CVE-2016-3120",
      "initial_release_date": "2016-07-19T00:00:00+00:00",
      "product_status:fixed": "96",
      "product_status:known_affected": "8",
      "product_status:known_not_affected": "5",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "krb5: S4U2Self KDC crash when anon is restricted",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2016/cve-2016-3120.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-08-21T01:51:34Z",
      "cve": "CVE-2016-3120",
      "id": "CVE-2016-3120",
      "initial_release_date": "2023-02-15T05:04:56Z",
      "product_status:known_affected": "320",
      "product_status:known_not_affected": "192",
      "product_status:recommended": "676",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2016-3120",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2016-3120.json",
      "version": "43"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.
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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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.