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.
Metrics
CVSS 3.0 6.5/10
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:NWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| n/a | n/a | n/a |
References
- http://php.net/ChangeLog-5.phpRelease Notes, Vendor Advisory
- http://php.net/ChangeLog-7.phpRelease Notes, Vendor Advisory
- http://www.debian.org/security/2017/dsa-3938
- http://www.securityfocus.com/bid/99492Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:0406
- https://access.redhat.com/errata/RHSA-2018:1296
- https://bugs.php.net/bug.php?id=74435Patch, Vendor Advisory
- https://bugs.php.net/patch-display.php?bug=74435&patch=fix-74435-php-7.0&revision=1497970038Issue Tracking, Patch, Vendor Advisory
- https://security.netapp.com/advisory/ntap-20180112-0001/
- https://www.tenable.com/security/tns-2017-12
- http://php.net/ChangeLog-5.phpRelease Notes, Vendor Advisory
- http://php.net/ChangeLog-7.phpRelease Notes, Vendor Advisory
- http://www.debian.org/security/2017/dsa-3938
- http://www.securityfocus.com/bid/99492Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:0406
- https://access.redhat.com/errata/RHSA-2018:1296
- https://bugs.php.net/bug.php?id=74435Patch, Vendor Advisory
- https://bugs.php.net/patch-display.php?bug=74435&patch=fix-74435-php-7.0&revision=1497970038Issue Tracking, Patch, Vendor Advisory
- https://security.netapp.com/advisory/ntap-20180112-0001/
- https://www.tenable.com/security/tns-2017-12
Timeline
- Published
- Aug 2, 2017
- Last modified
- Jun 17, 2026
- NVD status
- Modified