CVE-2015-8023

Name	CVE-2015-8023
Description	The server implementation of the EAP-MSCHAPv2 protocol in the eap-mschapv2 plugin in strongSwan 4.2.12 through 5.x before 5.3.4 does not properly validate local state, which allows remote attackers to bypass authentication via an empty Success message in response to an initial Challenge message.
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-345-1, DSA-3398-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
strongswan (PTS)	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	squeeze	4.4.1-5.8	DLA-345-1
strongswan	source	wheezy	4.5.2-1.5+deb7u8	DSA-3398-1
strongswan	source	jessie	5.2.1-6+deb8u2	DSA-3398-1
strongswan	source	(unstable)	5.3.3-3

https://www.strongswan.org/blog/2015/11/16/strongswan-vulnerability-%28cve-2015-8023%29.html