CVE-2020-13959

Name	CVE-2020-13959
Description	The default error page for VelocityView in Apache Velocity Tools prior to 3.1 reflects back the vm file that was entered as part of the URL. An attacker can set an XSS payload file as this vm file in the URL which results in this payload being executed. XSS vulnerabilities allow attackers to execute arbitrary JavaScript in the context of the attacked website and the attacked user. This can be abused to steal session cookies, perform requests in the name of the victim or for phishing attacks.
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-2597-1
Debian Bugs	985221

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
velocity-tools (PTS)	buster	2.0-7	vulnerable
	bookworm, bullseye	2.0-8	fixed
	trixie, sid	2.0-9	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
velocity-tools	source	stretch	2.0-6+deb9u1		DLA-2597-1
velocity-tools	source	(unstable)	2.0-8			985221

Notes

[buster] - velocity-tools <no-dsa> (Minor issue)
https://www.openwall.com/lists/oss-security/2021/03/10/2
Fixed by: https://github.com/apache/velocity-tools/commit/e141828a4eb03e4b0224535eed12b5c463a24152