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             AUSCERT External Security Bulletin Redistribution

              ESB-2005.0721 -- Sun Alert Notification 101926
          Security Vulnerability in the Xsun(1) and Xorg Servers
                              2 December 2005

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

Product:           Xorg server
                   Xsun (1) server
Publisher:         Sun Microsystems
Operating System:  Solaris 10
                   Solaris 9
                   Solaris 8
Impact:            Execute Arbitrary Code/Commands
Access:            Existing Account
CVE Names:         CAN-2005-2495

Ref:               ESB-2005.0706

Revision History:  December 2 2005: 
			Contributing Factors, Relief/workaround and 
			Resolution Sections updated
                   October 26 2005: 
			Sun have updated Contributing Factors, 
		  	Relief/Workaround, and Resolution sections
                   September 19 2005: 
			Initial Release

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Sun(sm) Alert Notification
     * Sun Alert ID: 101800
     * Synopsis: Security Vulnerability in the Xsun(1) and Xprt(1)
       Commands
     * Category: Security
     * Product: Solaris 9 Operating System, Solaris 10 Operating System,
       Solaris 7 Operating System, Solaris 8 Operating System
     * BugIDs: 6265045
     * Avoidance: Patch, Workaround
     * State: Workaround
     * Date Released: 26-Sep-2005
     * Date Closed: 
     * Date Modified: 30-Nov-2005

1. Impact

   A security vulnerability which affects the Xsun(1) and Xprt(1)
   commands may allow a a local unprivileged user the ability to execute
   arbitrary code with the privileges of either the Xsun(1) or Xprt(1)
   command.

   Sun acknowledges, with thanks, Eric Sheridan of Towson University for
   bringing this issue to our attention.

2. Contributing Factors

   This issue can occur in the following releases:

   SPARC Platform
     * Solaris 7 without patch 108376-46
     * Solaris 8 without patch 108652-93
     * Solaris 9 without patch 112785-50
     * Solaris 10 without patch 119059-05

   x86 Platform
     * Solaris 7
     * Solaris 8 without patch 108653-82
     * Solaris 9 without patch 112786-39
     * Solaris 10 without patch 119060-05

3. Symptoms

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

4. Relief/Workaround

   To work around the described issue, remove the setuid(2) and/or
   setgid(2) bit from Xsun(1) and Xprt(1).

   Note: Performing the above procedure will disable the following:

   1. The ability to run Xsun on Solaris x86.

   2. Power management and Interactive Process Priority control on
   Solaris SPARC.

   3. Xsun(1) and Xprt(1) ability to open Unix domain sockets and named
   pipe transports in the protected "/tmp/.X11-*" directories.

   Note: These features will still be available if Xsun(1) is started via
   display managers such as dtlogin(1) or gdm(1), however, the system
   would still be vulnerable to this issue.

5. Resolution

   This issue is addressed in the following releases:

   SPARC Platform
     * Solaris 7 with patch 108376-46 or later
     * Solaris 8 with patch 108652-93 or later
     * Solaris 9 with patch 112785-50 or later
     * Solaris 10 with patch 119059-05 or later

   x86 Platform
     * Solaris 8 with patch 108653-82 or later
     * Solaris 9 with patch 112786-39 or later
     * Solaris 10 with patch 119060-05 or later

   A final resolution is pending completion.

Change History

   30-Nov-2005:
     * Updated Contributing Factors and Relief/Workaround sections

   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 2000-2005 Sun Microsystems, Inc., 4150 Network Circle, Santa
   Clara, CA 95054 U.S.A. All rights reserved

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