Bug 1381933 (CVE-2016-7953)

Summary:	CVE-2016-7953 libXvMC: Insufficient validation of server responses results in buffer underflow
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	btissoir, kbost, sandmann, slawomir
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	libXvMC 1.0.10	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 02:59:43 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:	1381934
Bug Blocks:	1381939

Description Andrej Nemec 2016-10-05 11:43:13 UTC

It was found that when receiving a response from the server protocol data is not validated sufficiently. If an empty string is received from an x-server, the buffer might underrun by accessing "rep.nameLen - 1" unconditionally, which could end up being -1.

Upstream patch:

https://cgit.freedesktop.org/xorg/lib/libXvMC/commit/?id=2cd95e7da8367cccdcdd5c9b160012d1dec5cbdb

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 11:46:59 UTC

Created libXvMC tracking bugs for this issue:

Affects: fedora-all [bug 1381934]