usn-6591-2
Vulnerability from osv_ubuntu
Published
2024-01-31 13:34
Modified
2026-06-29 10:53
Summary
postfix update
Details

USN-6591-1 fixed vulnerabilities in Postfix. A fix with less risk of regression has been made available since the last update. This update updates the fix and aligns with the latest configuration guidelines regarding this vulnerability.

We apologize for the inconvenience.

Original advisory details:

Timo Longin discovered that Postfix incorrectly handled certain email line endings. A remote attacker could possibly use this issue to bypass an email authentication mechanism, allowing domain spoofing and potential spamming.

Please note that certain configuration changes are required to address this issue. They are not enabled by default for backward compatibility. Information can be found at https://www.postfix.org/smtp-smuggling.html.

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2023-51764",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:14.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "postfix",
            "binary_version": "2.11.0-1ubuntu1.2+esm3"
          },
          {
            "binary_name": "postfix-cdb",
            "binary_version": "2.11.0-1ubuntu1.2+esm3"
          },
          {
            "binary_name": "postfix-ldap",
            "binary_version": "2.11.0-1ubuntu1.2+esm3"
          },
          {
            "binary_name": "postfix-mysql",
            "binary_version": "2.11.0-1ubuntu1.2+esm3"
          },
          {
            "binary_name": "postfix-pcre",
            "binary_version": "2.11.0-1ubuntu1.2+esm3"
          },
          {
            "binary_name": "postfix-pgsql",
            "binary_version": "2.11.0-1ubuntu1.2+esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "postfix",
        "purl": "pkg:deb/ubuntu/postfix@2.11.0-1ubuntu1.2+esm3?arch=source\u0026distro=trusty/esm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.11.0-1ubuntu1.2+esm3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.10.2-1",
        "2.10.2-1build1",
        "2.11.0-1",
        "2.11.0-1ubuntu1",
        "2.11.0-1ubuntu1.2",
        "2.11.0-1ubuntu1.2+esm2"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2023-51764",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "postfix",
            "binary_version": "3.1.0-3ubuntu0.4+esm3"
          },
          {
            "binary_name": "postfix-cdb",
            "binary_version": "3.1.0-3ubuntu0.4+esm3"
          },
          {
            "binary_name": "postfix-ldap",
            "binary_version": "3.1.0-3ubuntu0.4+esm3"
          },
          {
            "binary_name": "postfix-mysql",
            "binary_version": "3.1.0-3ubuntu0.4+esm3"
          },
          {
            "binary_name": "postfix-pcre",
            "binary_version": "3.1.0-3ubuntu0.4+esm3"
          },
          {
            "binary_name": "postfix-pgsql",
            "binary_version": "3.1.0-3ubuntu0.4+esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "postfix",
        "purl": "pkg:deb/ubuntu/postfix@3.1.0-3ubuntu0.4+esm3?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.1.0-3ubuntu0.4+esm3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.11.3-1ubuntu2",
        "2.11.3-1ubuntu3",
        "3.0.4-1ubuntu1",
        "3.0.4-2",
        "3.0.4-3",
        "3.0.4-5",
        "3.0.4-5build1",
        "3.1.0-3",
        "3.1.0-3ubuntu0.1",
        "3.1.0-3ubuntu0.2",
        "3.1.0-3ubuntu0.3",
        "3.1.0-3ubuntu0.4",
        "3.1.0-3ubuntu0.4+esm2"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2023-51764",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "postfix",
            "binary_version": "3.3.0-1ubuntu0.4+esm3"
          },
          {
            "binary_name": "postfix-cdb",
            "binary_version": "3.3.0-1ubuntu0.4+esm3"
          },
          {
            "binary_name": "postfix-ldap",
            "binary_version": "3.3.0-1ubuntu0.4+esm3"
          },
          {
            "binary_name": "postfix-lmdb",
            "binary_version": "3.3.0-1ubuntu0.4+esm3"
          },
          {
            "binary_name": "postfix-mysql",
            "binary_version": "3.3.0-1ubuntu0.4+esm3"
          },
          {
            "binary_name": "postfix-pcre",
            "binary_version": "3.3.0-1ubuntu0.4+esm3"
          },
          {
            "binary_name": "postfix-pgsql",
            "binary_version": "3.3.0-1ubuntu0.4+esm3"
          },
          {
            "binary_name": "postfix-sqlite",
            "binary_version": "3.3.0-1ubuntu0.4+esm3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "postfix",
        "purl": "pkg:deb/ubuntu/postfix@3.3.0-1ubuntu0.4+esm3?arch=source\u0026distro=esm-infra/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.3.0-1ubuntu0.4+esm3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.2.3-1",
        "3.2.3-1build1",
        "3.2.4-1",
        "3.2.5-1",
        "3.2.5-1build1",
        "3.3.0-1",
        "3.3.0-1ubuntu0.1",
        "3.3.0-1ubuntu0.2",
        "3.3.0-1ubuntu0.3",
        "3.3.0-1ubuntu0.4",
        "3.3.0-1ubuntu0.4+esm2"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2023-51764",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "postfix",
            "binary_version": "3.4.13-0ubuntu1.4"
          },
          {
            "binary_name": "postfix-cdb",
            "binary_version": "3.4.13-0ubuntu1.4"
          },
          {
            "binary_name": "postfix-ldap",
            "binary_version": "3.4.13-0ubuntu1.4"
          },
          {
            "binary_name": "postfix-lmdb",
            "binary_version": "3.4.13-0ubuntu1.4"
          },
          {
            "binary_name": "postfix-mysql",
            "binary_version": "3.4.13-0ubuntu1.4"
          },
          {
            "binary_name": "postfix-pcre",
            "binary_version": "3.4.13-0ubuntu1.4"
          },
          {
            "binary_name": "postfix-pgsql",
            "binary_version": "3.4.13-0ubuntu1.4"
          },
          {
            "binary_name": "postfix-sqlite",
            "binary_version": "3.4.13-0ubuntu1.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "postfix",
        "purl": "pkg:deb/ubuntu/postfix@3.4.13-0ubuntu1.4?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.4.13-0ubuntu1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.4.5-1ubuntu1",
        "3.4.7-1",
        "3.4.7-2",
        "3.4.8-1",
        "3.4.9-1",
        "3.4.10-1",
        "3.4.10-1ubuntu1",
        "3.4.13-0ubuntu1",
        "3.4.13-0ubuntu1.1",
        "3.4.13-0ubuntu1.2",
        "3.4.13-0ubuntu1.3"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2023-51764",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:22.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "postfix",
            "binary_version": "3.6.4-1ubuntu1.3"
          },
          {
            "binary_name": "postfix-cdb",
            "binary_version": "3.6.4-1ubuntu1.3"
          },
          {
            "binary_name": "postfix-ldap",
            "binary_version": "3.6.4-1ubuntu1.3"
          },
          {
            "binary_name": "postfix-lmdb",
            "binary_version": "3.6.4-1ubuntu1.3"
          },
          {
            "binary_name": "postfix-mysql",
            "binary_version": "3.6.4-1ubuntu1.3"
          },
          {
            "binary_name": "postfix-pcre",
            "binary_version": "3.6.4-1ubuntu1.3"
          },
          {
            "binary_name": "postfix-pgsql",
            "binary_version": "3.6.4-1ubuntu1.3"
          },
          {
            "binary_name": "postfix-sqlite",
            "binary_version": "3.6.4-1ubuntu1.3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "postfix",
        "purl": "pkg:deb/ubuntu/postfix@3.6.4-1ubuntu1.3?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.6.4-1ubuntu1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.5.6-1ubuntu2",
        "3.5.13-1ubuntu1",
        "3.5.13-1ubuntu2",
        "3.5.13-1ubuntu3",
        "3.6.3-4ubuntu1",
        "3.6.3-5ubuntu1",
        "3.6.3-5ubuntu2",
        "3.6.4-1ubuntu1",
        "3.6.4-1ubuntu1.1",
        "3.6.4-1ubuntu1.2"
      ]
    }
  ],
  "aliases": [],
  "details": "USN-6591-1 fixed vulnerabilities in Postfix. A fix with less risk of\nregression has been made available since the last update. This update\nupdates the fix and aligns with the latest configuration guidelines\nregarding this vulnerability.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n Timo Longin discovered that Postfix incorrectly handled certain email line\n endings. A remote attacker could possibly use this issue to bypass an email\n authentication mechanism, allowing domain spoofing and potential spamming.\n \n Please note that certain configuration changes are required to address\n this issue. They are not enabled by default for backward compatibility.\n Information can be found at https://www.postfix.org/smtp-smuggling.html.\n",
  "id": "USN-6591-2",
  "modified": "2026-06-29T10:53:06Z",
  "published": "2024-01-31T13:34:03Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-6591-2"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2023-51764"
    },
    {
      "type": "REPORT",
      "url": "https://bugs.launchpad.net/ubuntu/+source/postfix/+bug/2049337"
    },
    {
      "type": "REPORT",
      "url": "https://bugs.launchpad.net/ubuntu/+source/postfix/+bug/2050834"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "postfix update",
  "upstream": [
    "UBUNTU-CVE-2023-51764"
  ]
}



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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.
  • 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.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.