CVE-2023-51765

Vulnerability Description

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 <LF>.<CR><LF> but some other popular e-mail servers do not. This is resolved in 8.18 and later versions with 'o' in srv_features.

CVSS Score

Affected Products

Related Weaknesses (CWE)

References

• http://www.openwall.com/lists/oss-security/2023/12/24/1Mailing ListThird Party Advisory
• http://www.openwall.com/lists/oss-security/2023/12/25/1Mailing ListThird Party Advisory
• http://www.openwall.com/lists/oss-security/2023/12/26/5Mailing ListThird Party Advisory
• http://www.openwall.com/lists/oss-security/2023/12/29/5Mailing ListThird Party Advisory
• http://www.openwall.com/lists/oss-security/2023/12/30/1Mailing ListThird Party Advisory
• http://www.openwall.com/lists/oss-security/2023/12/30/3Mailing ListThird Party Advisory
• https://access.redhat.com/security/cve/CVE-2023-51765Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2255869Issue TrackingThird Party Advisory
• https://bugzilla.suse.com/show_bug.cgi?id=1218351Issue TrackingPatchThird Party Advisory
• https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.htmlTechnical Description
• https://github.com/freebsd/freebsd-src/commit/5dd76dd0cc19450133aa379ce0ce4a68aePatch
• https://lists.debian.org/debian-lts-announce/2024/06/msg00004.html
• https://lwn.net/Articles/956533/
• https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/Technical DescriptionThird Party Advisory
• https://www.openwall.com/lists/oss-security/2023/12/21/7Mailing ListThird Party Advisory