CVE-2021-44142

Name	CVE-2021-44142
Description	The Samba vfs_fruit module uses extended file attributes (EA, xattr) to provide "...enhanced compatibility with Apple SMB clients and interoperability with a Netatalk 3 AFP fileserver." Samba versions prior to 4.13.17, 4.14.12 and 4.15.5 with vfs_fruit configured allow out-of-bounds heap read and write via specially crafted extended file attributes. A remote attacker with write access to extended file attributes can execute arbitrary code with the privileges of smbd, typically root.
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-5071-1
Debian Bugs	1004693

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	2:4.21.2+dfsg-3	fixed
	sid	2:4.21.2+dfsg-4	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
samba	source	experimental	2:4.16.0+dfsg-1
samba	source	buster	2:4.9.5+dfsg-5+deb10u3	DSA-5071-1
samba	source	bullseye	2:4.13.13+dfsg-1~deb11u3	DSA-5071-1
samba	source	(unstable)	2:4.16.0+dfsg-2		1004693

Notes

https://www.samba.org/samba/security/CVE-2021-44142.html
https://bugzilla.samba.org/show_bug.cgi?id=14914
https://www.zerodayinitiative.com/advisories/ZDI-22-244/
https://www.zerodayinitiative.com/advisories/ZDI-22-245/
https://www.zerodayinitiative.com/advisories/ZDI-22-246/