CVE-2020-8794

Name	CVE-2020-8794
Description	OpenSMTPD before 6.6.4 allows remote code execution because of an out-of-bounds read in mta_io in mta_session.c for multi-line replies. Although this vulnerability affects the client side of OpenSMTPD, it is possible to attack a server because the server code launches the client code during bounce handling.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DSA-4634-1
Debian Bugs	952453

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
opensmtpd (PTS)	buster, buster (security)	6.0.3p1-5+deb10u4	fixed
	bullseye	6.8.0p2-3	fixed
	bookworm	6.8.0p2-4	fixed
	trixie, sid	7.4.0p1-1	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
opensmtpd	source	stretch	6.0.2p1-2+deb9u3	DSA-4634-1
opensmtpd	source	buster	6.0.3p1-5+deb10u4	DSA-4634-1
opensmtpd	source	(unstable)	6.6.4p1-1		952453

Notes

https://www.openwall.com/lists/oss-security/2020/02/24/5
https://poolp.org/posts/2020-01-30/opensmtpd-advisory-dissected/
https://www.openwall.com/lists/oss-security/2020/02/26/1