gd_gif_in.c in the GD Graphics Library (aka libgd), as used in PHP before 5.6.33, 7.0.x before 7.0.27, 7.1.x before 7.1.13, and 7.2.x before 7.2.1, has an integer signedness error that leads to an infinite loop via a crafted GIF file, as demonstrated by a call to the imagecreatefromgif or imagecreatefromstring PHP function. This is related to GetCode_ and gdImageCreateFromGifCtx.
When converting from one data type to another, such as long to integer, data can be omitted or translated in a way that produces unexpected values. If the resulting values are used in a sensitive context, then dangerous behaviors may occur.
| Link | Tags |
|---|---|
| https://bugs.php.net/bug.php?id=75571 | patch vendor advisory |
| https://usn.ubuntu.com/3755-1/ | third party advisory vendor advisory |
| https://access.redhat.com/errata/RHSA-2018:1296 | third party advisory vendor advisory |
| http://php.net/ChangeLog-5.php | release notes vendor advisory |
| https://lists.debian.org/debian-lts-announce/2019/01/msg00028.html | third party advisory mailing list |
| http://php.net/ChangeLog-7.php | release notes vendor advisory |
| https://lists.debian.org/debian-lts-announce/2018/01/msg00022.html | third party advisory mailing list |
| https://security.gentoo.org/glsa/201903-18 | third party advisory vendor advisory |
| https://access.redhat.com/errata/RHSA-2019:2519 | vendor advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3CZ2QADQTKRHTGB2AHD7J4QQNDLBEMM6/ | vendor advisory |
| https://www.oracle.com/security-alerts/cpuapr2020.html |