CVE-2021-3639

Name	CVE-2021-3639
Description	A flaw was found in mod_auth_mellon where it does not sanitize logout URLs properly. This issue could be used by an attacker to facilitate phishing attacks by tricking users into visiting a trusted web application URL that redirects to an external and potentially malicious server. The highest threat from this liability is to confidentiality and integrity.
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-3359-1
Debian Bugs	991730

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libapache2-mod-auth-mellon (PTS)	buster	0.14.2-1	vulnerable
	buster (security)	0.14.2-1+deb10u1	fixed
	bullseye	0.17.0-1+deb11u1	fixed
	bookworm	0.18.1-1	fixed
	sid, trixie	0.19.0-1	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
libapache2-mod-auth-mellon	source	buster	0.14.2-1+deb10u1	DLA-3359-1
libapache2-mod-auth-mellon	source	bullseye	0.17.0-1+deb11u1
libapache2-mod-auth-mellon	source	(unstable)	0.18.0-1		991730

Notes

[stretch] - libapache2-mod-auth-mellon <no-dsa> (Minor issue)
https://github.com/latchset/mod_auth_mellon/commit/42a11261b9dad2e48d70bdff7c53dd57a12db6f5