CVE-2019-3878

Name	CVE-2019-3878
Description	A vulnerability was found in mod_auth_mellon before v0.14.2. If Apache is configured as a reverse proxy and mod_auth_mellon is configured to only let through authenticated users (with the require valid-user directive), adding special HTTP headers that are normally used to start the special SAML ECP (non-browser based) can be used to bypass authentication.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DSA-4414-1
Debian Bugs	925197

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libapache2-mod-auth-mellon (PTS)	bullseye	0.17.0-1+deb11u1	fixed
	bookworm	0.18.1-1	fixed
	forky, sid, trixie	0.19.1-1	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	jessie	(not affected)
libapache2-mod-auth-mellon	source	stretch	0.12.0-2+deb9u1	DSA-4414-1
libapache2-mod-auth-mellon	source	(unstable)	0.14.2-1		925197

Notes

[jessie] - libapache2-mod-auth-mellon <not-affected> (Vulnerable code not present)
https://bugzilla.redhat.com/show_bug.cgi?id=1576719
https://github.com/Uninett/mod_auth_mellon/pull/196
https://github.com/Uninett/mod_auth_mellon/commit/e09a28a30e13e5c22b481010f26b4a7743a09280