CVE-2017-7890

NameCVE-2017-7890
DescriptionThe 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-1055-1, DSA-3938-1
Debian Bugs869263

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
libgd2 (PTS)buster2.2.5-5.2fixed
bullseye2.3.0-2fixed
sid, trixie, bookworm2.3.3-9fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
libgd2sourcewheezy2.0.36~rc1~dfsg-6.1+deb7u9DLA-1055-1
libgd2sourcejessie2.1.0-5+deb8u10DSA-3938-1
libgd2sourcestretch2.2.4-2+deb9u1DSA-3938-1
libgd2source(unstable)2.2.5-1869263
php5source(unstable)(unfixed)unimportant
php7.0source(unstable)7.0.22-1unimportant
php7.1source(unstable)7.1.8-1unimportant

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

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