CVE-2021-23177

Name	CVE-2021-23177
Description	An improper link resolution flaw while extracting an archive can lead to changing the access control list (ACL) of the target of the link. An attacker may provide a malicious archive to a victim user, who would trigger this flaw when trying to extract the archive. A local attacker may use this flaw to change the ACL of a file on the system and gain more privileges.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-2987-1, DLA-3202-1
Debian Bugs	1001986

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libarchive (PTS)	buster	3.3.3-4+deb10u1	vulnerable
	buster (security)	3.3.3-4+deb10u3	fixed
	bullseye	3.4.3-2+deb11u1	fixed
	bookworm	3.6.2-1	fixed
	sid, trixie	3.7.2-2	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
libarchive	source	stretch	3.2.2-2+deb9u3	DLA-2987-1
libarchive	source	buster	3.3.3-4+deb10u2	DLA-3202-1
libarchive	source	bullseye	3.4.3-2+deb11u1
libarchive	source	(unstable)	3.5.2-1		1001986

Notes

https://github.com/libarchive/libarchive/issues/1565
https://github.com/libarchive/libarchive/commit/fba4f123cc456d2b2538f811bb831483bf336bad (v3.5.2)