CVE - CVE-2023-51764

CVE-ID
CVE-2023-51764	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
FEDORA:FEDORA-2024-5c186175f2 URL:https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JQ5WXFCW2N6G2PH3JXDTYW5PH5EBQEGO/ FEDORA:FEDORA-2024-c839e7294f URL:https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QRLF5SOS7TP5N7FQSEK2NFNB44ISVTZC/ MISC:https://access.redhat.com/security/cve/CVE-2023-51764 MISC:https://bugzilla.redhat.com/show_bug.cgi?id=2255563 MISC:https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html MISC:https://github.com/duy-31/CVE-2023-51764 MISC:https://github.com/eeenvik1/CVE-2023-51764 MISC:https://lwn.net/Articles/956533/ MISC:https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/ MISC:https://www.openwall.com/lists/oss-security/2024/01/22/1 MISC:https://www.postfix.org/announcements/postfix-3.8.5.html MISC:https://www.postfix.org/smtp-smuggling.html MISC:https://www.youtube.com/watch?v=V8KPV96g1To MLIST:[debian-lts-announce] 20240130 [SECURITY] [DLA 3725-1] postfix security update URL:https://lists.debian.org/debian-lts-announce/2024/01/msg00020.html MLIST:[oss-security] 20231224 Re: Re: New SMTP smuggling attack URL:http://www.openwall.com/lists/oss-security/2023/12/24/1 MLIST:[oss-security] 20231225 Re: Re: New SMTP smuggling attack URL:http://www.openwall.com/lists/oss-security/2023/12/25/1 MLIST:[oss-security] 20240508 Re: New SMTP smuggling attack URL:http://www.openwall.com/lists/oss-security/2024/05/09/3
Assigning CNA
MITRE Corporation
Date Record Created
20231224	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20231224)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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