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AUSCERT External Security Bulletin Redistribution
ESB-2007.0299 -- [UNIX/Linux][Solaris]
Xorg(1) Contains a Denial of Service Within the X Render
Extension's Trapezoid Rendering
7 May 2007
AusCERT Security Bulletin Summary
Product: XOrg 7.2 and prior
Publisher: Sun Microsystems
Operating System: Solaris 9 Operating System with JDS release 2
UNIX variants (UNIX, Linux, OSX)
Impact: Denial of Service
Access: Existing Account
Comment: This advisory references products which run on platforms other than
Solaris. Administrators running Xorg should check for an updated
version of the software for their operating system.
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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: Workaround
* State: Workaround
* Date Released: 03-May-2007
* Date Closed:
* Date Modified:
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:
2. Contributing Factors
This issue can occur in the following releases:
* Solaris 9 with JDS release 2 (for Xorg(1))
* Solaris 10 (for Xorg(1))
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
Should the described issue occur, the Xorg(1) server will exit without
To work around the described issue, disable the Render extension by
putting the following in the xorg.conf(4) file:
Option "RENDER" "disable"
Note: After applying this workaround, applications requiring the
Render extension may not run.
A final resolution is pending completion.
This Sun Alert notification is being provided to you on an "AS IS"
basis. This Sun Alert notification may contain information provided by
third parties. The issues described in this Sun Alert notification may
or may not impact your system(s). Sun makes no representations,
warranties, or guarantees as to the information contained herein. ANY
AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT
YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE
OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN.
This Sun Alert notification contains Sun proprietary and confidential
information. It is being provided to you pursuant to the provisions of
your agreement to purchase services from Sun, or, if you do not have
notification may only be used for the purposes contemplated by these
Copyright 2000-2006 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved
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