CVE-2023-51765 Information

Description

sendmail through at least 8.14.7 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 . but some other popular e-mail servers do not.

Reference

https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/ https://www.openwall.com/lists/oss-security/2023/12/22/7 https://www.openwall.com/lists/oss-security/2023/12/21/7 https://github.com/freebsd/freebsd-src/commit/5dd76dd0cc19450133aa379ce0ce4a68ae07fb39#diff-afdf514b32ac88004952c11660c57bc96c3d8b2234007c1cbd8d7ed7fd7935cc http://www.openwall.com/lists/oss-security/2023/12/24/1 http://www.openwall.com/lists/oss-security/2023/12/25/1 https://bugzilla.suse.com/show_bug.cgi?id=1218351 https://bugzilla.redhat.com/show_bug.cgi?id=2255869 https://access.redhat.com/security/cve/CVE-2023-51765 https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html http://www.openwall.com/lists/oss-security/2023/12/26/5