Bug 842841 (CVE-2012-1699)

Summary:	CVE-2012-1699 xorg-x11: DoS and information leak in xfs prior to X11R6.7
Product:	[Other] Security Response	Reporter:	Vincent Danen <vdanen>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	jrb
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2012-07-24 17:38:36 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:

Description Vincent Danen 2012-07-24 17:32:54 UTC

From the upstream announcement [1]:

A vulnerability has been found in the X11R6 font server code in the
handling of the SetEventMask request in xfs - if an invalid mask is
specified, it passes that bad mask to the SendErrToClient() function for
returning to the client in the error message.  Unfortunately,
SendErrToClient() expects a pointer, but was being passed the raw mask
value, causing it to use the mask as a pointer, either segfaulting (if that
happened to be an invalid pointer), or returning whatever data happened to
be accessible in the 4 bytes at the address specified by the mask value.

X11R6 through X11R6.6 appear to be vulnerable.   The fix shown below was
introduced by XFree86 in their 3.3.3 release as part of the commit for:
   Prototype/ansification cleanup for Xserver/XIE, xfs, fontlib, mkfontdir,
   and fix some bugs found along the way (#2103, Thomas Dickey).

X11R6.7 incorporated the XFree86 changes, and thus X11R6.7 and later releases
from X.Org are not vulnerable.

[1] http://lists.freedesktop.org/archives/xorg-announce/2012-July/002040.html

Statement:

Not vulnerable. This issue did not affect the versions of xorg-x11-xfs as shipped with Red Hat Enterprise Linux 5.  It does not affect Red Hat Enterprise Linux 6 as it no longer uses or provides the XFS font server.