CVE-2023-51765

Name	CVE-2023-51765
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-3829-1
Debian Bugs	1059386

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
sendmail (PTS)	bullseye	8.15.2-22+deb11u3	fixed
	bookworm	8.17.1.9-2+deb12u2	fixed
	trixie	8.18.1-6	fixed
	forky, sid	8.18.1-7	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin	Debian Bugs
sendmail	source	buster	8.15.2-14~deb10u2	DLA-3829-1
sendmail	source	bullseye	8.15.2-22+deb11u1
sendmail	source	bookworm	8.17.1.9-2+deb12u1
sendmail	source	(unstable)	8.18.1-1		1059386

Notes

https://sec-consult.com/blog/detail/smtp-smuggling-spoofing-e-mails-worldwide/
https://www.openwall.com/lists/oss-security/2023/12/21/6
https://www.openwall.com/lists/oss-security/2023/12/26/5