CVE-2021-32921

Name	CVE-2021-32921
Description	An issue was discovered in Prosody before 0.11.9. It does not use a constant-time algorithm for comparing certain secret strings when running under Lua 5.2 or later. This can potentially be used in a timing attack to reveal the contents of secret strings to an attacker.
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-2687-1, DSA-4916-1
Debian Bugs	988668

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
prosody (PTS)	jessie, jessie (lts)	0.9.7-2+deb8u4	vulnerable
	stretch (security), stretch (lts), stretch	0.9.12-2+deb9u4	fixed
	buster (security), buster, buster (lts)	0.11.2-1+deb10u4	fixed
	bullseye (security), bullseye	0.11.9-2+deb11u2	fixed
	bookworm	0.12.3-1	fixed
	sid, trixie	0.12.4-2	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
prosody	source	jessie	(unfixed)	end-of-life
prosody	source	stretch	0.9.12-2+deb9u3		DLA-2687-1
prosody	source	buster	0.11.2-1+deb10u1		DSA-4916-1
prosody	source	(unstable)	0.11.9-1			988668

Notes

https://www.openwall.com/lists/oss-security/2021/05/13/1
https://prosody.im/security/advisory_20210512.txt
https://hg.prosody.im/trunk/rev/c98aebe601f9
https://hg.prosody.im/trunk/rev/13b84682518e
https://hg.prosody.im/trunk/rev/6f56170ea986