CVE-2017-7890

Name	CVE-2017-7890
Description	The GIF decoding function gdImageCreateFromGifCtx in gd_gif_in.c in the GD Graphics Library (aka libgd), as used in PHP before 5.6.31 and 7.x before 7.1.7, does not zero colorMap arrays before use. A specially crafted GIF image could use the uninitialized tables to read ~700 bytes from the top of the stack, potentially disclosing sensitive information.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more)
References	DLA-1055-1, DSA-3938-1
Debian Bugs	869263

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
libgd2 (PTS)	buster	2.2.5-5.2	fixed
	bullseye	2.3.0-2	fixed
	bookworm, sid	2.3.3-9	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
libgd2	source	wheezy	2.0.36~rc1~dfsg-6.1+deb7u9		DLA-1055-1
libgd2	source	jessie	2.1.0-5+deb8u10		DSA-3938-1
libgd2	source	stretch	2.2.4-2+deb9u1		DSA-3938-1
libgd2	source	(unstable)	2.2.5-1			869263
php5	source	(unstable)	(unfixed)	unimportant
php7.0	source	(unstable)	7.0.22-1	unimportant
php7.1	source	(unstable)	7.1.8-1	unimportant

Notes

PHP Bug: https://bugs.php.net/bug.php?id=74435
Fixed in 7.1.7, 7.0.21, 5.6.31
https://github.com/libgd/libgd/issues/399
https://github.com/libgd/libgd/commit/c613bc169802bb4b639ee2e15c61b25b80a88424