Debian-LTS alert DLA-120-2 (xorg-server)

From:
    	     
 
Mike Gabriel <sunweaver@debian.org> 
To:
    	     
 
debian-lts-announce@lists.debian.org 
Subject:
    	     
 
[SECURITY] [DLA 120-2] xorg-server regression update 
Date:
    	     
 
Mon, 4 May 2015 06:06:46 +0200
Message-ID:
    	     
 
<20150504040645.GA4718@minobo.das-netzwerkteam.de>
Package        : xorg-server
Version        : 2:1.7.7-18+deb6u3
CVE ID         : CVE-2015-3418
Debian Bug     : #774308 

Andreas Cord-Landwehr reported an issue where the X.Org Xserver would
often crash with an arithmetic exception when maximizing application
windows.

This issue (CVE-2015-3418) is a regression which got introduced by fixing
CVE-2014-8092. The above referenced version of xorg-server in Debian
squeeze-lts fixes this regression in the following way:

The length checking code validates PutImage height and byte width by
making sure that byte-width >= INT32_MAX / height. If height is zero,
this generates a divide by zero exception. Allow zero height requests
explicitly, bypassing the INT32_MAX check (in dix/dispatch.c).

-- 

mike gabriel aka sunweaver (Debian Developer)
fon: +49 (1520) 1976 148

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mail: sunweaver@debian.org, http://sunweavers.net