gsd-2023-51764
Vulnerability from gsd
Modified
2023-12-24 06:01
Details
Postfix through 3.8.4 allows SMTP smuggling unless configured with smtpd_data_restrictions=reject_unauth_pipelining (or certain other options that exist in recent versions). Remote attackers can use a published exploitation technique to inject e-mail messages that appear to originate from the Postfix server, allowing bypass of an SPF protection mechanism. This occurs because Postfix supports <LF>.<CR><LF> but some other popular e-mail servers do not. To prevent attack variants (by always disallowing <LF> without <CR>), a different solution is required: the smtpd_forbid_bare_newline=yes option with a Postfix minimum version of 3.5.23, 3.6.13, 3.7.9, 3.8.4, or 3.9.
Aliases


To clipboard 

{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2023-51764"
      ],
      "details": "Postfix through 3.8.4 allows SMTP smuggling unless configured with smtpd_data_restrictions=reject_unauth_pipelining (or certain other options that exist in recent versions). Remote attackers can use a published exploitation technique to inject e-mail messages that appear to originate from the Postfix server, allowing bypass of an SPF protection mechanism. This occurs because Postfix supports \u003cLF\u003e.\u003cCR\u003e\u003cLF\u003e but some other popular e-mail servers do not. To prevent attack variants (by always disallowing \u003cLF\u003e without \u003cCR\u003e), a different solution is required: the smtpd_forbid_bare_newline=yes option with a Postfix minimum version of 3.5.23, 3.6.13, 3.7.9, 3.8.4, or 3.9.",
      "id": "GSD-2023-51764",
      "modified": "2023-12-24T06:01:27.964396Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
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        "ASSIGNER": "cve@mitre.org",
        "ID": "CVE-2023-51764",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "n/a",
                    "version": {
                      "version_data": [
                        {
                          "version_value": "n/a"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "n/a"
            }
          ]
        }
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      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
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          }
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      },
      "problemtype": {
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                "value": "n/a"
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      "references": {
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            "url": "https://www.postfix.org/smtp-smuggling.html"
          },
          {
            "name": "https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/",
            "refsource": "MISC",
            "url": "https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/"
          },
          {
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            "refsource": "MLIST",
            "url": "http://www.openwall.com/lists/oss-security/2023/12/24/1"
          },
          {
            "name": "[oss-security] 20231225 Re: Re: New SMTP smuggling attack",
            "refsource": "MLIST",
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          },
          {
            "name": "https://bugzilla.redhat.com/show_bug.cgi?id=2255563",
            "refsource": "MISC",
            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2255563"
          },
          {
            "name": "https://access.redhat.com/security/cve/CVE-2023-51764",
            "refsource": "MISC",
            "url": "https://access.redhat.com/security/cve/CVE-2023-51764"
          },
          {
            "name": "https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html",
            "refsource": "MISC",
            "url": "https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html"
          },
          {
            "name": "https://github.com/eeenvik1/CVE-2023-51764",
            "refsource": "MISC",
            "url": "https://github.com/eeenvik1/CVE-2023-51764"
          },
          {
            "name": "https://github.com/duy-31/CVE-2023-51764",
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          },
          {
            "name": "https://www.youtube.com/watch?v=V8KPV96g1To",
            "refsource": "MISC",
            "url": "https://www.youtube.com/watch?v=V8KPV96g1To"
          },
          {
            "name": "FEDORA-2024-c839e7294f",
            "refsource": "FEDORA",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QRLF5SOS7TP5N7FQSEK2NFNB44ISVTZC/"
          },
          {
            "name": "FEDORA-2024-5c186175f2",
            "refsource": "FEDORA",
            "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JQ5WXFCW2N6G2PH3JXDTYW5PH5EBQEGO/"
          },
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            "refsource": "MISC",
            "url": "https://www.openwall.com/lists/oss-security/2024/01/22/1"
          },
          {
            "name": "https://www.postfix.org/announcements/postfix-3.8.5.html",
            "refsource": "MISC",
            "url": "https://www.postfix.org/announcements/postfix-3.8.5.html"
          },
          {
            "name": "[debian-lts-announce] 20240130 [SECURITY] [DLA 3725-1] postfix security update",
            "refsource": "MLIST",
            "url": "https://lists.debian.org/debian-lts-announce/2024/01/msg00020.html"
          }
        ]
      }
    },
    "nvd.nist.gov": {
      "cve": {
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            "nodes": [
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          {
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        ],
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          {
            "lang": "en",
            "value": "Postfix through 3.8.5 allows SMTP smuggling unless configured with smtpd_data_restrictions=reject_unauth_pipelining and smtpd_discard_ehlo_keywords=chunking (or certain other options that exist in recent versions). 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 Postfix supports \u003cLF\u003e.\u003cCR\u003e\u003cLF\u003e but some other popular e-mail servers do not. To prevent attack variants (by always disallowing \u003cLF\u003e without \u003cCR\u003e), a different solution is required, such as the smtpd_forbid_bare_newline=yes option with a Postfix minimum version of 3.5.23, 3.6.13, 3.7.9, 3.8.4, or 3.9."
          },
          {
            "lang": "es",
            "value": "Postfix hasta 3.8.4 permite el contrabando SMTP a menos que se configure con smtpd_data_restrictions=reject_unauth_pipelining (u otras opciones que existen en versiones recientes). Los atacantes remotos pueden utilizar una t\u00e9cnica de explotaci\u00f3n publicada para inyectar mensajes de correo electr\u00f3nico que parecen originarse en el servidor Postfix, lo que permite omitir un mecanismo de protecci\u00f3n SPF. Esto ocurre porque Postfix admite . pero algunos otros servidores de correo electr\u00f3nico populares no lo hacen. Para evitar variantes de ataque (al no permitir siempre  sin ), se requiere una soluci\u00f3n diferente: la opci\u00f3n smtpd_forbid_bare_newline=yes con una versi\u00f3n m\u00ednima de Postfix de 3.5.23, 3.6.13, 3.7.9, 3.8.4, o 3.9."
          }
        ],
        "id": "CVE-2023-51764",
        "lastModified": "2024-01-30T14:15:47.213",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 5.3,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "LOW",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 1.4,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2023-12-24T05:15:08.273",
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          },
          {
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            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JQ5WXFCW2N6G2PH3JXDTYW5PH5EBQEGO/"
          },
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            "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QRLF5SOS7TP5N7FQSEK2NFNB44ISVTZC/"
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            "url": "https://lwn.net/Articles/956533/"
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            "tags": [
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              "Third Party Advisory"
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            "url": "https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/"
          },
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          },
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            "url": "https://www.postfix.org/announcements/postfix-3.8.5.html"
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            "tags": [
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            "url": "https://www.postfix.org/smtp-smuggling.html"
          },
          {
            "source": "cve@mitre.org",
            "tags": [
              "Exploit"
            ],
            "url": "https://www.youtube.com/watch?v=V8KPV96g1To"
          }
        ],
        "sourceIdentifier": "cve@mitre.org",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-345"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    }
  }
}


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