Bug 1381859 (CVE-2016-7942)

Summary:	CVE-2016-7942 libX11: Insufficient validation of server responses in XGetImage()
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	ajax, kbost, sandmann, slawomir
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	libX11 1.6.4	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 02:59:24 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:	1381863
Bug Blocks:	1381939

Description Andrej Nemec 2016-10-05 08:36:49 UTC

It was found that when receiving a response from the server protocol data is not validated sufficiently. A check is needed if enough bytes were received for specified image type and geometry. Otherwise GetPixel and other functions could trigger an out of boundary read.

Upstream patch:

https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=8ea762f94f4c942d898fdeb590a1630c83235c17

External References:

https://lists.x.org/archives/xorg-announce/2016-October/002720.html

CVE assignment:

http://seclists.org/oss-sec/2016/q4/17

Comment 1 Andrej Nemec 2016-10-05 08:40:24 UTC

Created libX11 tracking bugs for this issue:

Affects: fedora-all [bug 1381863]