CVE-2018-6548

Name	CVE-2018-6548
Description	A use-after-free issue was discovered in libwebm through 2018-02-02. If a Vp9HeaderParser was initialized once before, its property frame_ would not be changed because of code in vp9parser::Vp9HeaderParser::SetFrame. Its frame_ could be freed while the corresponding pointer would not be updated, leading to a dangling pointer. This is related to the function OutputCluster in webm_info.cc.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
chromium-browser (PTS)	jessie, jessie (lts)	57.0.2987.98-1~deb8u1	vulnerable
	stretch (security), stretch (lts), stretch	71.0.3578.80-1~deb9u1	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
chromium-browser	source	(unstable)	(unfixed)	unimportant

Notes

Chromium is built with support for VP9 disabled in Debian
https://bugs.chromium.org/p/webm/issues/detail?id=1493
https://github.com/dwfault/PoCs/blob/master/libwebm%20Vp9HeaderParser%20UAF%20by%20PrintVP9Info/libwebm%20Vp9HeaderParser%20UAF%20by%20PrintVP9Info.md