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                                    CERT-Renater

                         Note d'Information No. 2006/VULN126
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DATE                      : 31/03/2006

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : Solaris 10.

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Sun(sm) Alert Notification
      * Sun Alert ID: 102252
      * Synopsis: Security Vulnerabilities found in the Xorg(1) X11R6.9
        and X11R7.0 Server
      * Category: Security
      * Product: Solaris 10 Operating System
      * BugIDs: 6396593
      * Avoidance: Workaround, Patch
      * State: Resolved
      * Date Released: 20-Mar-2006, 28-Mar-2006
      * Date Closed: 28-Mar-2006
      * Date Modified: 28-Mar-2006

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 local unprivileged
    user may be able to create or overwrite any file on the system or
    execute arbitrary code with elevated privileges due to several
    security vulnerabilities found in the Xorg X server.

    Sun acknowledges, with thanks, the X.Org Foundation for bringing these
    issues to our attention. Sun also thanks Coverity for donating their
    'Coverity Prevent' product to the X.Org Foundation which uncovered
    these issues.

    These issues are referenced in the following document:

    CVE-2006-0745 at:
    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0745

2. Contributing Factors

    These issues can occur in the following releases:

    x86 Platform
      * Solaris 10 with patch 118966-14 through 118966-16 and without
        patch 118966-18

    Note: This issue only affects Xorg(1) X server releases 6.9 and 7.0.
    To determine the version of the Xorg X server the following command
    can be run:
     $ /usr/X11/bin/Xorg -version
     X Window System Version 6.8.0 (Sun Xorg Release 1.1 for Solaris 10)
     Release Date: 8 September 2004
     X Protocol Version 11, Revision 0, Release 6.8
     [...]


3. Symptoms

    There are no predictable symptoms that would show if one of the
    described vulnerabilities has been exploited to execute arbitrary code
    with elevated privileges. There also aren't any predicable symptoms
    which would show a system file had been overwritten as it would depend
    on which file had been modified.

4. Relief/Workaround

    Either of the following options are valid workarounds until the
    resolution patch can be installed on the system.

    1) Backout patch 118966-14/15/16 if possible (i.e. if not freshbitted
    and not installed without saving files for backout) using patchrm(1M)
    as the root user. For example:
     # patchrm 118966-14

    OR

    2) Remove the setuid(2) bit from the Xorg server. For example as the
    root user the following command can be run:
     # chmod 755 /usr/X11/bin/Xorg

    Note that removing the setuid bit from the Xorg server will prevent
    non-root users from being able to start Xorg on Solaris x86 via the
    command line (typically via xinit(1)). Xorg will still be available
    when started via a display manager such as dtlogin(1), gdm(1) or
    xdm(1).


5. Resolution

    This issue is addressed in the following releases:

    x86 Platform
      * Solaris 10 with patch 118966-18 or later


Change History

    28-Mar-2006:
      * Updated Relief/Workaround and Resolution sections
      * State: Resolved

    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,
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    AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
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    This Sun Alert notification contains Sun proprietary and confidential
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    Copyright 2000-2006 Sun Microsystems, Inc., 4150 Network Circle, Santa
    Clara, CA 95054 U.S.A. All rights reserved

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