CVE-2023-3347

Name	CVE-2023-3347
Description	A vulnerability was found in Samba's SMB2 packet signing mechanism. The SMB2 packet signing is not enforced if an admin configured "server signing = required" or for SMB2 connections to Domain Controllers where SMB2 packet signing is mandatory. This flaw allows an attacker to perform attacks, such as a man-in-the-middle attack, by intercepting the network traffic and modifying the SMB2 messages between client and server, affecting the integrity of the data.
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-5477-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
samba (PTS)	bullseye (security), bullseye	2:4.13.13+dfsg-1~deb11u6	fixed
	bookworm, bookworm (security)	2:4.17.12+dfsg-0+deb12u1	fixed
	sid, trixie	2:4.21.1+dfsg-2	fixed

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

Package	Type	Release	Fixed Version	Origin
samba	source	buster	(not affected)
samba	source	bullseye	(not affected)
samba	source	bookworm	2:4.17.10+dfsg-0+deb12u1	DSA-5477-1
samba	source	(unstable)	2:4.18.5+dfsg-1

Notes

[bullseye] - samba <not-affected> (Vulnerable code not present)
[buster] - samba <not-affected> (Vulnerable code not present)
https://www.samba.org/samba/security/CVE-2023-3347.html