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.

References

https://www.tenable.com/security/tns-2017-12

https://security.netapp.com/advisory/ntap-20180112-0001/

https://bugs.php.net/patch-display.php?bug=74435&patch=fix-74435-php-7.0&revision=1497970038

https://bugs.php.net/bug.php?id=74435

https://access.redhat.com/errata/RHSA-2018:1296

https://access.redhat.com/errata/RHSA-2018:0406

http://www.securityfocus.com/bid/99492

http://www.debian.org/security/2017/dsa-3938

http://php.net/ChangeLog-7.php

http://php.net/ChangeLog-5.php

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3