CVE-2023-51765

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.

Published: Dec 24, 2023
Updated: Jan 10, 2024
CVE: CVE-2023-51765
Severity: Medium
Exploit:

CVSS v3:

Severity: Medium
Score: 5.3
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CWEs:

CWE-345

Affected Software
References

Software	From	Fixed in
sendmail / sendmail	-	8.18.0.2
freebsd / freebsd	-	11.0
redhat / enterprise_linux	8.0	8.0.x
redhat / enterprise_linux	9.0	9.0.x

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/2023/12/26/5
http://www.openwall.com/lists/oss-security/2023/12/29/5
http://www.openwall.com/lists/oss-security/2023/12/30/1
http://www.openwall.com/lists/oss-security/2023/12/30/3
https://access.redhat.com/security/cve/CVE-2023-51765
https://bugzilla.redhat.com/show_bug.cgi?id=2255869
https://bugzilla.suse.com/show_bug.cgi?id=1218351
https://fahrplan.events.ccc.de/congress/2023/fahrplan/events/11782.html
https://github.com/freebsd/freebsd-src/commit/5dd76dd0cc19450133aa379ce0ce4a68ae07fb39#diff-afdf514b32ac88004952c11660c57bc96c3d8b2234007c1cbd8d7ed7fd7935cc
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/
https://www.openwall.com/lists/oss-security/2023/12/21/7
https://www.openwall.com/lists/oss-security/2023/12/22/7
https://www.youtube.com/watch?v=V8KPV96g1To

Vulnerability Database

289,599

CVE-2023-51765