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AUSCERT External Security Bulletin Redistribution
ESB-2007.0426 -- [Solaris]
Xorg(1) Contains a Denial of Service Within the X Render
Extension's Trapezoid Rendering
18 June 2007
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AusCERT Security Bulletin Summary
---------------------------------
Product: Xorg
Publisher: Sun Microsystems
Operating System: Solaris
Impact: Denial of Service
Access: Remote/Unauthenticated
Original Bulletin:
http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-102901-1
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Sun(sm) Alert Notification
* Sun Alert ID: 102901
* Synopsis: Xorg(1) Contains a Denial of Service Within the X Render
Extension's Trapezoid Rendering
* Category: Security
* Product: Solaris 9 Operating System, Solaris 10 Operating System
* BugIDs: 6541018
* Avoidance: Patch, Workaround
* State: Workaround
* Date Released: 03-May-2007
* Date Closed:
* Date Modified: 14-Jun-2007
1. Impact
A divide by zero security vulnerability exists in the X11 Render
Extension to the X11 display server Xorg(1). By using specially
crafted values for compositing or adding trapezoids, a local or remote
unprivileged user who is able to display data on a running X11 server
instance may cause a divide by zero error within the X11 Render
Extension. This would cause the X11 display server Xorg(1) to crash,
resulting in a denial of service (DoS) to the Xorg(1) server.
This issue is described in the following document:
* http://www.rapid7.com/advisories/R7-0027.jsp
2. Contributing Factors
This issue can occur in the following releases:
x86 Platform
* Solaris 9 with JDS release 2 (for Xorg(1))
* Solaris 10 (for Xorg(1)) without patch 125720-05
Note: Solaris 8 is not affected by this issue. Solaris 9 and Solaris
10 on the SPARC platform are also not affected.
To determine if JDS release 2 is installed on a Solaris 9 x86 system,
the following command can be run:
% grep distributor-version /usr/share/gnome-about/gnome-version.xml
<distributor-version>Sun Java Desktop System, Release 2</distributor-versio
n>
3. Symptoms
Should the described issue occur, the Xorg(1) server will exit without
warning.
4. Relief/Workaround
To work around the described issue, disable the Render extension by
putting the following in the xorg.conf(4) file:
Section "Extensions"
Option "RENDER" "disable"
EndSection
Note: After applying this workaround, applications requiring the
Render extension may not run.
5. Resolution
This issue is addressed in the following releases:
x86 Platform
* Solaris 10 (for Xorg(1)) with patch 125720-05 or later
A final resolution is pending completion.
Change History
14-Jun-2007:
* Updated Contributing Factors and Resolution sections
This Sun Alert notification is being provided to you on an "AS IS"
basis. This Sun Alert notification may contain information provided by
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Copyright 2000-2006 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved
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