CVE-2017-12425

Name	CVE-2017-12425
Description	An issue was discovered in Varnish HTTP Cache 4.0.1 through 4.0.4, 4.1.0 through 4.1.7, 5.0.0, and 5.1.0 through 5.1.2. A wrong if statement in the varnishd source code means that particular invalid requests from the client can trigger an assert, related to an Integer Overflow. This causes the varnishd worker process to abort and restart, losing the cached contents in the process. An attacker can therefore crash the varnishd worker process on demand and effectively keep it from serving content - a Denial-of-Service attack. The specific source-code filename containing the incorrect statement varies across releases.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DSA-3924-1
Debian Bugs	870467

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
varnish (PTS)	jessie, jessie (lts)	4.0.2-1+deb8u1	fixed
	stretch (security), stretch (lts), stretch	5.0.0-7+deb9u3	fixed
	buster (security), buster, buster (lts)	6.1.1-1+deb10u4	fixed
	bullseye (security), bullseye	6.5.1-1+deb11u3	fixed
	bookworm	7.1.1-1.1	fixed
	sid, trixie	7.6.1-2	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
varnish	source	wheezy	(not affected)
varnish	source	jessie	4.0.2-1+deb8u1	DSA-3924-1
varnish	source	stretch	5.0.0-7+deb9u1	DSA-3924-1
varnish	source	(unstable)	5.0.0-7.1		870467

Notes

[wheezy] - varnish <not-affected> (code path is not exposed to clients)
https://www.varnish-cache.org/security/VSV00001.html#vsv00001
https://github.com/varnishcache/varnish-cache/issues/2379
https://github.com/varnishcache/varnish-cache/commit/09731b24b2225e3c0d66d3ec1b4fedef6fa22b6e