CVE-2021-41991

Name	CVE-2021-41991
Description	The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving many requests with different certificates to fill the cache and later trigger the replacement of cache entries. The code attempts to select a less-often-used cache entry by means of a random number generator, but this is not done correctly. Remote code execution might be a slight possibility.
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-2788-1, DSA-4989-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
strongswan (PTS)	buster	5.7.2-1+deb10u2	fixed
	buster (security)	5.7.2-1+deb10u4	fixed
	bullseye (security), bullseye	5.9.1-1+deb11u4	fixed
	bookworm, bookworm (security)	5.9.8-5+deb12u1	fixed
	sid, trixie	5.9.13-2	fixed

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

Package	Type	Release	Fixed Version	Origin
strongswan	source	stretch	5.5.1-4+deb9u5	DLA-2788-1
strongswan	source	buster	5.7.2-1+deb10u1	DSA-4989-1
strongswan	source	bullseye	5.9.1-1+deb11u1	DSA-4989-1
strongswan	source	(unstable)	5.9.4-1

https://www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-(cve-2021-41991).html