Bug 1380450 (CVE-2016-7568)

Summary:	CVE-2016-7568 gd, php: Integer overflow in gdImageWebpCtx
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	abhgupta, carnil, dmcphers, dmoppert, fedora, hhorak, jialiu, jmlich83, jokerman, jorton, kseifried, lmeyer, mmccomas, mskalick, rcollet, tiwillia, varekova, webstack-team
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	An integer overflow flaw, leading to a heap-based buffer overflow, was found in gd. A specially crafted image, when converted to webp, could cause the application to crash or potentially execute arbitrary code.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-09-30 04:08:01 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1380452, 1380453
Bug Blocks:	1380454

Description Adam Mariš 2016-09-29 16:00:19 UTC

An integer overflow vulnerability was found in function gdImageWebpCtx of file gd_webp.c in libgd. It could lead to heap buffer overflow. Both PHP 7.0.10 and libgd 2.2.3 were affected.

PHP bug:

https://bugs.php.net/bug.php?id=73003

PHP patch:

https://github.com/php/php-src/commit/c18263e0e0769faee96a5d0ee04b750c442783c6

libgd bug:

https://github.com/libgd/libgd/issues/308

libgd patch:

https://github.com/libgd/libgd/commit/40bec0f38f50e8510f5bb71a82f516d46facde03

CVE assignment:

http://seclists.org/oss-sec/2016/q3/639

Comment 1 Adam Mariš 2016-09-29 16:04:26 UTC

Created gd tracking bugs for this issue:

Affects: fedora-all [bug 1380453]

Comment 2 Adam Mariš 2016-09-29 16:04:37 UTC

Created php tracking bugs for this issue:

Affects: fedora-all [bug 1380452]

Comment 3 Doran Moppert 2016-09-30 03:44:40 UTC

This vulnerability is only present if gd is build against libwebp.  Fedora does so, but no Red Hat Enterprise Linux versions of gd do.