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ESB-2007.0565 -- [UNIX/Linux][Solaris] -- A Security Vulnerability in lbxproxy(1) may Allow Unauthorized Read Access to Files

Date: 10 August 2007

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                  ESB-2007.0565 -- [UNIX/Linux][Solaris]
        A Security Vulnerability in lbxproxy(1) may Allow Unauthori
                         zed Read Access to Files
                              10 August 2007

===========================================================================

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

Product:              lbxproxy
Publisher:            Sun Microsystems
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Solaris 8, 9 and 10
Impact:               Access Privileged Data
Access:               Existing Account
CVE Names:            CVE-2007-4070

Original Bulletin:   
  http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-102948-1

Comment: It has not yet been confirmed whether this vulnerability affects
         Solaris only, or also affects the upstream X.org and XFree86
         lbxproxy programs supplied to other platforms.
         
         System administrators running lbxproxy on other operating systems
         may consider restricting access to lbxproxy to trusted users only
         until this is resolved.

Revision History:  August 10 2007: Added CVE Name
                     July 27 2007: Initial Release

- --------------------------BEGIN INCLUDED TEXT--------------------

Sun(sm) Alert Notification
     * Sun Alert ID: 102948
     * Synopsis: A Security Vulnerability in lbxproxy(1) may Allow
       Unauthorized Read Access to Files
     * Category: Security
     * Product: Solaris 9 Operating System, Solaris 10 Operating System,
       Solaris 8 Operating System
     * BugIDs: 6473929
     * Avoidance: Patch, Workaround
     * State: Resolved
     * Date Released: 25-Jul-2007
     * Date Closed: 25-Jul-2007
     * Date Modified: 

1. Impact

   A Security Vulnerability in Low Bandwidth X proxy (lbxproxy(1)) may
   allow a local unprivileged user, the ability to read some data from
   any file that has group ownership of root on the system.

   lbxproxy(1) is used for making connections to the X11 Display Server
   (Xserver or Xorg) faster over a low bandWidth connection.

   Sun acknowledges with thanks, Charles Morris, Old Dominion University,
   for discovering and reporting this issue.

2. Contributing Factors

   This issue can occur in the following releases:

   SPARC Platform
     * Solaris 8 without patch 119067-08
     * Solaris 9 without patch 112785-62
     * Solaris 10 without patch 119059-28

   x86 Platform
     * Solaris 8 without patch 119068-08
     * Solaris 9 without patch 112786-51
     * Solaris 10 without patch 119060-27

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 until patches can be applied, users
   may wish to turn off the set group ID bit for the "lbxproxy" binary.
   This can be done by issuing the following command as root user:
    # chmod g-s /usr/openwin/bin/lbxproxy

   After the set group ID permissions have been removed the "lbxproxy"
   command should be run with the "-pn" option so that the program will
   continue to run after it fails to establish its well-known sockets and
   instead listen for client connections over TCP.

   The DISPLAY environment variable should be set using the format of
   "hostname:display" instead of just ":display" so that clients will
   connect over TCP.

5. Resolution

   This issue is addressed in the following releases:

   SPARC Platform
     * Solaris 8 with patch 119067-08 or later
     * Solaris 9 with patch 112785-62 or later
     * Solaris 10 with patch 119059-28 or later

   x86 Platform
     * Solaris 8 with patch 119068-08 or later
     * Solaris 9 with patch 112786-51 or later
     * Solaris 10 with patch 119060-27 or later

   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 2000-2006 Sun Microsystems, Inc., 4150 Network Circle, Santa
   Clara, CA 95054 U.S.A. All rights reserved

- --------------------------END INCLUDED TEXT--------------------

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        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
===========================================================================

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