May 2006

ID: 00335
Ref: 330/06
Date: 08 May 2006:11:18:16
Version: 1

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Title: Sun Security Bulletin: Sun Alert ID: 102339 Security Vulnerability in the Xorg(1) Version of the Render Extension
Abstract: A buffer overflow in the X Render extension may allow an unprivileged local or remote user who is a client of the Xorg X server the ability to execute arbitrary code with the privileges of the Xorg server.
Vendors affected: Sun
Operating systems affected: Sun
Applications affected: Sun

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Sun(sm) Alert Notification
* Sun Alert ID: 102339
* Synopsis: Security Vulnerability in the Xorg(1) Version of the
Render Extension
* Category: Security
* Product: Solaris 10 Operating System
* BugIDs: 6416841
* Avoidance: T-Patch, Workaround
* State: Workaround
* Date Released: 04-May-2006
* Date Closed:
* Date Modified:

1. Impact

The Xorg X server (see Xorg(1)) is one of the X Window System display
servers available on the Solaris x86 platform. A buffer overflow in
the X Render extension may allow an unprivileged local or remote user
who is a client of the Xorg X server the ability to execute arbitrary
code with the privileges of the Xorg server. The Xorg X server runs
with root privileges on Solaris.

This issue is described in the following documents:
* CVE-2006-1526 at:
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1526
* http://lists.freedesktop.org/archives/xorg/2006-May/015136.html

2. Contributing Factors

This issue can occur in the following release:

x86 Platform
* Solaris 10

Note: Solaris 8 and Solaris 9 are not affected by this issue. Solaris
10 on the SPARC platform is also not affected.

The described issue only occurs on systems with the SUNWxorg packages
installed. To determine if the SUNWxorg packages are installed on the
system, the following command can be used:
pkginfo SUNWxorg-server


3. Symptoms

There are no predictable symptoms that would show the described issue
has been exploited.

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.

A preliminary T-patch is available for the following release from
http://sunsolve.sun.com/tpatches:

x86 Platform
* Solaris 10 T-patch T118966-20

This document refers to one or more preliminary temporary patches
(T-Patches) which are designed to address the concerns identified
herein. Sun has limited experience with these patches due to their
preliminary nature. As such, you should only install the patches on
systems meeting the configurations described above. Sun may release
full patches at a later date, however, Sun is under no obligation
whatsoever to create, release, or distribute any such patch.

5. Resolution

A final resolution is pending completion.

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