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Category:   Application (Generic)  >   X Vendors:   X.org
(Sun Issues Fix) X11R6 XKEYBOARD Extension Buffer Overflow Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1016807
SecurityTracker URL:  http://securitytracker.com/id/1016807
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Sep 8 2006
Impact:   Execution of arbitrary code via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): X11R6.4 and prior versions
Description:   A vulnerability was reported in X11R6. A local user can obtain elevated privileges on the target system.

A string manipulation function of the X11R6 X Window System library contains a buffer overflow. When the XKEYBOARD extension is enabled, a local user can set the _XKB_CHARSET environment variable and the DISPLAY environment variable to a specially crafted value and invoke an application that is dynamically linked to the affected library to execute arbitrary code on the target system. The code will run with the privileges of the application.

Adriano Lima and Filipe Balestra of RISE Security discovered this vulnerability.

The original advisory is available at:

http://www.risesecurity.org/advisory/RISE-2006001.txt

Impact:   A local user can obtain elevated privileges on the target system.
Solution:   Sun has issued the following fixes.

SPARC Platform

* Solaris 8 with patch 119067-03 or later
* Solaris 9 with patch 112785-56 or later
* Solaris 10 with patch 119059-16 or later

x86 Platform

* Solaris 8 with patch 119068-03 or later
* Solaris 9 with patch 112786-45 or later
* Solaris 10 with patch 119060-15 or later

The Sun advisory is available at:

http://sunsolve.sun.com/search/document.do?assetkey=1-26-102570-1

Vendor URL:  sunsolve.sun.com/search/document.do?assetkey=1-26-102570-1 (Links to External Site)
Cause:   Boundary error
Underlying OS:  UNIX (Solaris - SunOS)
Underlying OS Comments:  8, 9, 10

Message History:   This archive entry is a follow-up to the message listed below.
Sep 8 2006 X11R6 XKEYBOARD Extension Buffer Overflow Lets Local Users Gain Elevated Privileges



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