CVE-2017-7890

MEDIUM severity · CVSS 6.5 · Information disclosure

6.5CVSS MEDIUM

Summary

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.

Impact & exploitability

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionRequired

Confidentiality impactHigh

Integrity impactNone

Availability impactNone

Exploit probability (EPSS)30%

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Affected products we track (1)

PHP

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

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

Additional information

NVD record
https://bugs.php.net/bug.php?id=74435Patch
https://bugs.php.net/patch-display.php?bug=74435&patch=fix-74435-php-7.0&revision=1497970038Patch
http://php.net/ChangeLog-5.phpAdvisory
http://php.net/ChangeLog-7.phpAdvisory
http://www.debian.org/security/2017/dsa-3938
http://www.securityfocus.com/bid/99492Advisory
https://access.redhat.com/errata/RHSA-2018:0406
https://access.redhat.com/errata/RHSA-2018:1296