DescriptionThe imagetruecolortopalette function in ext/gd/gd.c in PHP before 5.6.25 and 7.x before 7.0.10 does not properly validate the number of colors, which allows remote attackers to cause a denial of service (select_colors allocation error and out-of-bounds write) or possibly have unspecified other impact via a large value in the third argument.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SuSE, Mageia, GitHub code/issues, web search, more)
NVD severityhigh (attack range: remote)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
libgd2 (PTS)wheezy2.0.36~rc1~dfsg-6.1+deb7u2fixed
wheezy (security)2.0.36~rc1~dfsg-6.1+deb7u10fixed
jessie (security), jessie2.1.0-5+deb8u11fixed
stretch (security), stretch2.2.4-2+deb9u2fixed
buster, sid2.2.5-4fixed
php5 (PTS)wheezy5.4.45-0+deb7u2vulnerable
wheezy (security)5.4.45-0+deb7u11vulnerable
jessie (security), jessie5.6.30+dfsg-0+deb8u1fixed
php7.0 (PTS)stretch7.0.19-1fixed
buster, sid7.0.26-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
libgd2source(unstable)(not affected)


- libgd2 <not-affected> (libgd upstream not affected, overflow2 function check prevents the issue)
PHP Bug:
Fixed in 7.0.10, 5.6.25

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