CVE-2021-3520

Name	CVE-2021-3520
Description	There's a flaw in lz4. An attacker who submits a crafted file to an application linked with lz4 may be able to trigger an integer overflow, leading to calling of memmove() on a negative size argument, causing an out-of-bounds write and/or a crash. The greatest impact of this flaw is to availability, with some potential impact to confidentiality and integrity as well.
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-2657-1, DSA-4919-1, ELA-427-1
Debian Bugs	987856

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
lz4 (PTS)	jessie, jessie (lts)	0.0~r122-2+deb8u1	fixed
	stretch (security), stretch (lts), stretch	0.0~r131-2+deb9u1	fixed
	buster (security), buster, buster (lts)	1.8.3-1+deb10u1	fixed
	bullseye	1.9.3-2	fixed
	bookworm	1.9.4-1	fixed
	sid, trixie	1.9.4-3	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
lz4	source	jessie	0.0~r122-2+deb8u1	ELA-427-1
lz4	source	stretch	0.0~r131-2+deb9u1	DLA-2657-1
lz4	source	buster	1.8.3-1+deb10u1	DSA-4919-1
lz4	source	(unstable)	1.9.3-2		987856

https://github.com/lz4/lz4/pull/972
Fixed by: https://github.com/lz4/lz4/commit/8301a21773ef61656225e264f4f06ae14462bca7