ubuntu-cve-2023-51765
Vulnerability from osv_ubuntu
Published
2023-12-24 06:15
Modified
2026-04-22 07:45
Summary
Details

sendmail through 8.17.2 allows SMTP smuggling in certain configurations. Remote attackers can use a published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection mechanism. This occurs because sendmail supports . but some other popular e-mail servers do not. This is resolved in 8.18 and later versions with 'o' in srv_features.

Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmilter1.0.1",
            "binary_version": "8.14.4-4.1ubuntu1.1"
          },
          {
            "binary_name": "rmail",
            "binary_version": "8.14.4-4.1ubuntu1.1"
          },
          {
            "binary_name": "sendmail",
            "binary_version": "8.14.4-4.1ubuntu1.1"
          },
          {
            "binary_name": "sendmail-base",
            "binary_version": "8.14.4-4.1ubuntu1.1"
          },
          {
            "binary_name": "sendmail-bin",
            "binary_version": "8.14.4-4.1ubuntu1.1"
          },
          {
            "binary_name": "sendmail-cf",
            "binary_version": "8.14.4-4.1ubuntu1.1"
          },
          {
            "binary_name": "sensible-mda",
            "binary_version": "8.14.4-4.1ubuntu1.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
        "name": "sendmail",
        "purl": "pkg:deb/ubuntu/sendmail@8.14.4-4.1ubuntu1.1?arch=source\u0026distro=trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "8.14.4-2.1ubuntu4",
        "8.14.4-2.1ubuntu5",
        "8.14.4-4.1ubuntu1",
        "8.14.4-4.1ubuntu1.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmilter1.0.1",
            "binary_version": "8.15.2-3"
          },
          {
            "binary_name": "rmail",
            "binary_version": "8.15.2-3"
          },
          {
            "binary_name": "sendmail",
            "binary_version": "8.15.2-3"
          },
          {
            "binary_name": "sendmail-base",
            "binary_version": "8.15.2-3"
          },
          {
            "binary_name": "sendmail-bin",
            "binary_version": "8.15.2-3"
          },
          {
            "binary_name": "sendmail-cf",
            "binary_version": "8.15.2-3"
          },
          {
            "binary_name": "sensible-mda",
            "binary_version": "8.15.2-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "sendmail",
        "purl": "pkg:deb/ubuntu/sendmail@8.15.2-3?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "8.14.9-4",
        "8.15.2-2",
        "8.15.2-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmilter1.0.1",
            "binary_version": "8.15.2-10"
          },
          {
            "binary_name": "rmail",
            "binary_version": "8.15.2-10"
          },
          {
            "binary_name": "sendmail",
            "binary_version": "8.15.2-10"
          },
          {
            "binary_name": "sendmail-base",
            "binary_version": "8.15.2-10"
          },
          {
            "binary_name": "sendmail-bin",
            "binary_version": "8.15.2-10"
          },
          {
            "binary_name": "sendmail-cf",
            "binary_version": "8.15.2-10"
          },
          {
            "binary_name": "sensible-mda",
            "binary_version": "8.15.2-10"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "sendmail",
        "purl": "pkg:deb/ubuntu/sendmail@8.15.2-10?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "8.15.2-8ubuntu1",
        "8.15.2-9ubuntu1",
        "8.15.2-10"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmilter1.0.1",
            "binary_version": "8.15.2-18"
          },
          {
            "binary_name": "rmail",
            "binary_version": "8.15.2-18"
          },
          {
            "binary_name": "sendmail",
            "binary_version": "8.15.2-18"
          },
          {
            "binary_name": "sendmail-base",
            "binary_version": "8.15.2-18"
          },
          {
            "binary_name": "sendmail-bin",
            "binary_version": "8.15.2-18"
          },
          {
            "binary_name": "sendmail-cf",
            "binary_version": "8.15.2-18"
          },
          {
            "binary_name": "sensible-mda",
            "binary_version": "8.15.2-18"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "sendmail",
        "purl": "pkg:deb/ubuntu/sendmail@8.15.2-18?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "8.15.2-13",
        "8.15.2-17ubuntu1",
        "8.15.2-18"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libmilter1.0.1",
            "binary_version": "8.15.2-22ubuntu3"
          },
          {
            "binary_name": "rmail",
            "binary_version": "8.15.2-22ubuntu3"
          },
          {
            "binary_name": "sendmail",
            "binary_version": "8.15.2-22ubuntu3"
          },
          {
            "binary_name": "sendmail-base",
            "binary_version": "8.15.2-22ubuntu3"
          },
          {
            "binary_name": "sendmail-bin",
            "binary_version": "8.15.2-22ubuntu3"
          },
          {
            "binary_name": "sendmail-cf",
            "binary_version": "8.15.2-22ubuntu3"
          },
          {
            "binary_name": "sensible-mda",
            "binary_version": "8.15.2-22ubuntu3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "sendmail",
        "purl": "pkg:deb/ubuntu/sendmail@8.15.2-22ubuntu3?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "8.15.2-22ubuntu2",
        "8.15.2-22ubuntu3"
      ]
    }
  ],
  "aliases": [],
  "details": "sendmail through 8.17.2 allows SMTP smuggling in certain configurations. Remote attackers can use a published exploitation technique to inject e-mail messages with a spoofed MAIL FROM address, allowing bypass of an SPF protection mechanism. This occurs because sendmail supports \u003cLF\u003e.\u003cCR\u003e\u003cLF\u003e but some other popular e-mail servers do not. This is resolved in 8.18 and later versions with \u0027o\u0027 in srv_features.",
  "id": "UBUNTU-CVE-2023-51765",
  "modified": "2026-04-22T07:45:30Z",
  "published": "2023-12-24T06:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2023-51765"
    },
    {
      "type": "REPORT",
      "url": "https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/"
    },
    {
      "type": "REPORT",
      "url": "https://www.openwall.com/lists/oss-security/2023/12/21/6"
    },
    {
      "type": "REPORT",
      "url": "https://www.openwall.com/lists/oss-security/2023/12/26/5"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2023-51765"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "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"
    }
  ],
  "upstream": [
    "CVE-2023-51765"
  ]
}



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