Test ID:	1.3.6.1.4.1.25623.1.0.114255
Category:	SMTP problems
Title:	Postfix SMTP Smuggling Vulnerability (Dec 2023)
Summary:	Postfix is prone to a SMTP smuggling vulnerability.
Description:	Summary: Postfix is prone to a SMTP smuggling vulnerability. Vulnerability Insight: Postfix 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 . but some other popular e-mail servers do not. To prevent attack variants (by always disallowing without ), 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. Affected Software/OS: Postfix versions through 3.8.4. Solution: Update to version 3.5.23, 3.6.13, 3.7.9, 3.8.4, 3.9 or later and set the option mentioned by the vendor within the Postfix configuration. CVSS Score: 5.0 CVSS Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N
Cross-Ref:	Common Vulnerability Exposure (CVE) ID: CVE-2023-51764 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JQ5WXFCW2N6G2PH3JXDTYW5PH5EBQEGO/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QRLF5SOS7TP5N7FQSEK2NFNB44ISVTZC/ https://access.redhat.com/security/cve/CVE-2023-51764 https://bugzilla.redhat.com/show_bug.cgi?id=2255563 https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html https://github.com/duy-31/CVE-2023-51764 https://github.com/eeenvik1/CVE-2023-51764 https://lwn.net/Articles/956533/ https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/ https://www.openwall.com/lists/oss-security/2024/01/22/1 https://www.postfix.org/announcements/postfix-3.8.5.html https://www.postfix.org/smtp-smuggling.html https://www.youtube.com/watch?v=V8KPV96g1To https://lists.debian.org/debian-lts-announce/2024/01/msg00020.html http://www.openwall.com/lists/oss-security/2023/12/24/1 http://www.openwall.com/lists/oss-security/2023/12/25/1 http://www.openwall.com/lists/oss-security/2024/05/09/3
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