CVE-2018-16841

Name	CVE-2018-16841
Description	Samba from version 4.3.0 and before versions 4.7.12, 4.8.7 and 4.9.3 are vulnerable to a denial of service. When configured to accept smart-card authentication, Samba's KDC will call talloc_free() twice on the same memory if the principal in a validly signed certificate does not match the principal in the AS-REQ. This is only possible after authentication with a trusted certificate. talloc is robust against further corruption from a double-free with talloc_free() and directly calls abort(), terminating the KDC process.
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-4345-1

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
	trixie	2:4.21.3+dfsg-1	fixed
	sid	2:4.21.3+dfsg-6	fixed

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

Package	Type	Release	Fixed Version	Origin
samba	source	jessie	(not affected)
samba	source	stretch	2:4.5.12+dfsg-2+deb9u4	DSA-4345-1
samba	source	(unstable)	2:4.9.2+dfsg-2

[jessie] - samba <not-affected> (Vulnerable code not present)
https://www.samba.org/samba/security/CVE-2018-16841.html