CVE-2023-3961

Name	CVE-2023-3961
Description	A path traversal vulnerability was identified in Samba when processing client pipe names connecting to Unix domain sockets within a private directory. Samba typically uses this mechanism to connect SMB clients to remote procedure call (RPC) services like SAMR LSA or SPOOLSS, which Samba initiates on demand. However, due to inadequate sanitization of incoming client pipe names, allowing a client to send a pipe name containing Unix directory traversal characters (../). This could result in SMB clients connecting as root to Unix domain sockets outside the private directory. If an attacker or client managed to send a pipe name resolving to an external service using an existing Unix domain socket, it could potentially lead to unauthorized access to the service and consequential adverse events, including compromise or service crashes.
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-5525-1

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	2:4.17.12+dfsg-0+deb12u1	DSA-5525-1
samba	source	(unstable)	2:4.19.1+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-2023-3961.html
In scope for continued Samba support