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             AUSCERT External Security Bulletin Redistribution

                              ESB-2009.1345.2
           A Security Vulnerability in xscreensaver May Display
           Portions of a Locked Desktop if the Screen is Resized
                             29 September 2009

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           xscreensaver
Publisher:         Sun Microsystems
Operating System:  Solaris
                   OpenSolaris
Impact/Access:     Read-only Data Access -- Console/Physical
Resolution:        Patch/Upgrade
CVE Names:         CVE-2009-3432  

Original Bulletin: 
   http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-249646-1

Revision History:  September 29 2009: Added CVE Reference
                   September 28 2009: Initial Release

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Solution Type: Sun Alert
Solution  249646 :   A Security Vulnerability in xscreensaver(1) May
Display Portions of a Locked Desktop if the Screen is Resized          
Bug ID: 6757448

Product:
Solaris 10 Operating System
OpenSolaris

Date of Resolved Release: 22-Sep-2009

SA Document Body
A security vulnerability in xscreensaver(1) may display portions of a locked
desktop after being resized:

1. Impact

A security vulnerability in the xscreensaver(1) program may allow
users with physical access to an X(5) display running the Xorg(1) X
server (or Xnewt(1M) X server for Sun Ray servers)  which has the X
Resize and Rotate (RandR) extension loaded to be able to view portions
of the locked screen.

2. Contributing Factors

This issue can occur in the following releases:
SPARC Platform
  * Solaris 10 without patch 120094-26
  * OpenSolaris based upon builds snv_01 through snv_111

x86 Platform
  * Solaris 10 without patch 120095-26
  * OpenSolaris based upon builds snv_01 through snv_111

Note 1: Solaris 8 and Solaris 9 are not impacted by this issue.
Note 2: This issue only affects systems configured to use the Xorg(1)
X server (or Xnewt(1M) X server for Sun Ray servers).  To determine
which X Window System display server program (see Xserver(1)) is
configured on a Solaris (non-Sun Ray server) system the following
command can be run:
 $ svcprop -p options/server svc:/application/x11/x11-server
 /usr/X11/bin/Xorg

To determine which X Window System display server program (see
Xserver(1)) is configured on a Sun Ray server the following command
can be run:
 $ /opt/SUNWut/bin/utxconfig -l |grep XSERVER
 XSERVER_PREF=Xnewt

Note 3: This issue only affects systems which have used the RandR
extension to resize the screen (for example using the xrandr(1)
utility). To determine if the RandR extension is loaded, the
xdpyinfo(1) utility can be run:
 $ xdpyinfo | grep RANDR
 RANDR

Note 4: OpenSolaris distributions may include additional bug fixes
above and beyond the build from which it was derived.  To determine
the base build of OpenSolaris, the following command can be used:
 $ uname -v
 snv_86

Note 5:  Only OpenSolaris installations that include the affected
binary "/usr/X11/bin/xscreensaver", are impacted by this issue.

3. Symptoms

If the RandR extension has been used to increase the size of the
screen, for example using xrandr(1), then xscreensaver(1) will only
cover the original screen size.

4. Workaround

To work around the described issue once the screen has been resized
using the RandR extension, restarting xscreensaver(1) using the
following command:
 $ /usr/X11/bin/xscreensaver-command -restart

will resolve the issue.

5. Resolution

This issue is addressed in the following releases:
SPARC Platform
  * Solaris 10 with patch 120094-26 or later
  * OpenSolaris based upon builds snv_112 or later

x86 Platform
  * Solaris 10 with patch 120095-26 or later
  * OpenSolaris based upon builds snv_112 or later

For more information on Security Sun Alerts, see Technical
Instruction ID 213557.

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
such an agreement, the Sun.com Terms of Use. This Sun Alert
notification may only be used for the purposes contemplated by these
agreements. 

Copyright 2000-2009 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved

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