{
    "CVE_data_meta": {
        "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"
                }
            ]
        }
    },
    "data_format": "MITRE",
    "data_type": "CVE",
    "data_version": "4.0",
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "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 <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, 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."
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "n/a"
                    }
                ]
            }
        ]
    },
    "references": {
        "reference_data": [
            {
                "url": "https://www.postfix.org/smtp-smuggling.html",
                "refsource": "MISC",
                "name": "https://www.postfix.org/smtp-smuggling.html"
            },
            {
                "url": "https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/",
                "refsource": "MISC",
                "name": "https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/"
            },
            {
                "refsource": "MLIST",
                "name": "[oss-security] 20231224 Re: Re: New SMTP smuggling attack",
                "url": "http://www.openwall.com/lists/oss-security/2023/12/24/1"
            },
            {
                "refsource": "MLIST",
                "name": "[oss-security] 20231225 Re: Re: New SMTP smuggling attack",
                "url": "http://www.openwall.com/lists/oss-security/2023/12/25/1"
            },
            {
                "refsource": "MISC",
                "name": "https://bugzilla.redhat.com/show_bug.cgi?id=2255563",
                "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2255563"
            },
            {
                "refsource": "MISC",
                "name": "https://access.redhat.com/security/cve/CVE-2023-51764",
                "url": "https://access.redhat.com/security/cve/CVE-2023-51764"
            },
            {
                "refsource": "MISC",
                "name": "https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html",
                "url": "https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html"
            },
            {
                "refsource": "MISC",
                "name": "https://github.com/eeenvik1/CVE-2023-51764",
                "url": "https://github.com/eeenvik1/CVE-2023-51764"
            },
            {
                "refsource": "MISC",
                "name": "https://github.com/duy-31/CVE-2023-51764",
                "url": "https://github.com/duy-31/CVE-2023-51764"
            },
            {
                "refsource": "MISC",
                "name": "https://www.youtube.com/watch?v=V8KPV96g1To",
                "url": "https://www.youtube.com/watch?v=V8KPV96g1To"
            },
            {
                "refsource": "FEDORA",
                "name": "FEDORA-2024-c839e7294f",
                "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QRLF5SOS7TP5N7FQSEK2NFNB44ISVTZC/"
            },
            {
                "refsource": "FEDORA",
                "name": "FEDORA-2024-5c186175f2",
                "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JQ5WXFCW2N6G2PH3JXDTYW5PH5EBQEGO/"
            },
            {
                "refsource": "MISC",
                "name": "https://lwn.net/Articles/956533/",
                "url": "https://lwn.net/Articles/956533/"
            },
            {
                "refsource": "MISC",
                "name": "https://www.openwall.com/lists/oss-security/2024/01/22/1",
                "url": "https://www.openwall.com/lists/oss-security/2024/01/22/1"
            },
            {
                "refsource": "MISC",
                "name": "https://www.postfix.org/announcements/postfix-3.8.5.html",
                "url": "https://www.postfix.org/announcements/postfix-3.8.5.html"
            },
            {
                "refsource": "MLIST",
                "name": "[debian-lts-announce] 20240130 [SECURITY] [DLA 3725-1] postfix security update",
                "url": "https://lists.debian.org/debian-lts-announce/2024/01/msg00020.html"
            },
            {
                "refsource": "MLIST",
                "name": "[oss-security] 20240508 Re: New SMTP smuggling attack",
                "url": "http://www.openwall.com/lists/oss-security/2024/05/09/3"
            }
        ]
    }
}