libpam-krb5 — security advisory

{
  "id": "86a2f49a71b95872f39eef3b179f121c25b514b4b06e44e1ce57809c57e6c5a2",
  "url": "https://osv.dev/vulnerability/DEBIAN-CVE-2023-3326",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "DEBIAN-CVE-2023-3326",
    "summary": "pam_krb5 authenticates a user by essentially running kinit with the password, getting a ticket-granting ticket (tgt) from the Kerberos KDC (Key Distribution Center) over the network, as a way to verify the password. However, if a keytab is not provisioned on the system, pam_krb5 has no way to validate the response from the KDC, and essentially trusts the tgt provided over the network as being valid. In a non-default FreeBSD installation that leverages pam_krb5 for authentication and does not have a keytab provisioned, an attacker that is able to control both the password and the KDC responses can return a valid tgt, allowing authentication to occur for any user on the system.",
    "evidence": "osv:DEBIAN-CVE-2023-3326",
    "products": [
      {
        "name": {
          "value": "libpam-krb5",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "4.11-1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.11-1.1",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "4.11-2",
            "evidence": "/affected/0/versions"
          }
        ]
      },
      {
        "name": {
          "value": "libpam-krb5",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "4.11-2",
            "evidence": "/affected/1/versions"
          }
        ]
      },
      {
        "name": {
          "value": "libpam-krb5",
          "evidence": "/affected/2/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "4.11-2",
            "evidence": "/affected/2/versions"
          }
        ]
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "DEBIAN-CVE-2023-3326",
      "aliases": [
        "DEBIAN-CVE-2023-3326"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "libpam-krb5",
            "purl": "pkg:deb/debian/libpam-krb5?arch=source&distro=bookworm",
            "ecosystem": "Debian:12"
          },
          "versions": [
            "4.11-1",
            "4.11-1.1",
            "4.11-2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-3326.json"
          },
          "ecosystem_specific": {
            "urgency": "unimportant"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "libpam-krb5",
            "purl": "pkg:deb/debian/libpam-krb5?arch=source&distro=trixie",
            "ecosystem": "Debian:13"
          },
          "versions": [
            "4.11-2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-3326.json"
          },
          "ecosystem_specific": {
            "urgency": "unimportant"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "libpam-krb5",
            "purl": "pkg:deb/debian/libpam-krb5?arch=source&distro=forky",
            "ecosystem": "Debian:14"
          },
          "versions": [
            "4.11-2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2023-3326.json"
          },
          "ecosystem_specific": {
            "urgency": "unimportant"
          }
        }
      ],
      "modified": "2026-10-26T18:02:41.083394883Z",
      "provider": "osv",
      "upstream": [
        "CVE-2023-3326"
      ],
      "references": [
        "https://security-tracker.debian.org/tracker/CVE-2023-3326"
      ]
    },
    "related_cves": [
      {
        "value": "CVE-2023-3326",
        "evidence": "/upstream"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 456589,
  "published_at": "2023-06-22T17:15:44.833+00:00"
}