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Date : Wed, 18 Jun 2008 11:58:34 +0200
Type : VULN
Sujet : CERT-Renater : 2008/VULN228 (Sun: Multiple security vulnerabilities in Solaris X Server Extensions)
====================================================================                                    CERT-Renater

                         Note d'Information No. 2008/VULN228
_____________________________________________________________________

DATE                      : 18/06/2008

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : Solaris 8, Solaris 9, Solaris 10,
                              OpenSolaris running Solaris X Server
                              Extensions.

======================================================================
http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-238686-1
______________________________________________________________________

    Solution Type: Sun Alert
    Solution  238686 :   Multiple security vulnerabilities in the Solaris
    X Server Extensions may lead to a Denial of Service (DoS) condition
    or allow Execution of Arbitrary Code
    Bug ID: 6683567, 6683568

    Product
    Solaris 8 Operating System, Solaris 9 Operating System, Solaris 10
    Operating System, OpenSolaris

    Date of Workaround Release: 12-Jun-2008

    SA Document Body
    Multiple security vulnerabilities in the Solaris X Server Extensions
    may lead to a Denial of Service (DoS) condition or allow Execution of
    Arbitrary Code

    1. Impact
    Multiple integer, heap and buffer overflow security vulnerabilities
    exist in the Render, RECORD, Security, and MIT-SHM Extensions to the
    Solaris X11 display server (Xorg(1) and Xsun(1)) and the Solaris X11
    print server (Xprt(1)).  These vulnerabilities may allow a local or
    remote unprivileged user who is authorized (via xhost(1) or xauth(1))
    to connect to the X server and execute arbitrary code with root
    privileges, access arbitrary memory within the X server's address
    space, or crash the X11 display server process. The ability to crash
    the X11 display server is a type of Denial of Service (DoS).
    These issues are described in the following documents:

    CVE-2008-2360 at
    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2360
    CVE-2008-2361 at
    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2361
    CVE-2008-2362 at
    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2362
    CVE-2008-1379 at
    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1379
    CVE-2008-1377 at
    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1377

    2. Contributing Factors
    These issues can occur in the following releases:
    SPARC Platform
      * Solaris 8
      * Solaris 9
      * Solaris 10
      * OpenSolaris based upon builds snv_01 or later

    x86 Platform
      * Solaris 8
      * Solaris 9
      * Solaris 9 with JDS release 2
      * Solaris 10
      * OpenSolaris based upon builds snv_01 or later

    Notes:
    1. To determine if JDS release 2 is installed on a Solaris 9 x86
    system, the following command can be run:
    % grep distributor-version /usr/share/gnome-about/gnome-version.xml
    Sun Java Desktop System, Release
2

    2. Only OpenSolaris installations including the affected binary
    "/usr/X11/bin/i386/Xorg" are impacted by this issue.
    3. OpenSolaris distributions may include additional bug fixes above
    and beyond the base build from which it was derived.  The base build
    can be derived as follows:
    $ uname -a
    SunOS osolsys 5.11 snv_86 i86pc i386 i86pc

    4. To determine if the effected X Server extensions are enabled on a
    running X server, the following command can be run:
    $ xdpyinfo | egrep "MIT-SHM|RENDER|SECURITY|RECORD"
     MIT-SHM
     RECORD
     RENDER
     SECURITY

    On Solaris 10, in case of Xsun(1), the issues reported in
    CVE-2008-2360, CVE-2008-2361 and CVE-2008-2362 will not be applicable
    by default. They will be applicable only if the user has turned on the
    RENDER extension support by adding "+xrender" CLI option to Xsun in
    which case the user can work around it by removing the "+xrender"
    option.  Also, these issues are not applicable for Xsun(1) server on
    Solaris 8 as the RENDER extension support is not present.
    3. Symptoms
    There are no predictable symptoms that would indicate that these
    issues have been exploited to execute arbitrary code.
    If any of the described issues do occur, the X server will exit and
    may generate an error message about a segmentation fault, and may also
    write a core(4) file.
    4. Workaround
    To work around the described issues for the Xorg(1) server, the
    affected X Server extensions may be disabled.
    The following command may be used to disable Xorg server extensions:
    $ /usr/X11/bin/Xorg -extension 

    This change will be valid until the Xorg server is restarted, for
    example on logout. The command will need to be repeated for each new
    instance of the Xorg server.
    For example, the MIT-SHM extension may be disabled as follows:
    $ /usr/X11/bin/Xorg -extension MIT-SHM

    The X Server extensions may also be disabled by editing the
    xorg.conf(4) file. For example, to disable the MIT-SHM extension, the
    following lines may be added to the xorg.conf(4) file:

    Section "Extensions"
        Option "MIT-SHM" "disable"
        Option "RENDER" "disable"
        Option "SECURITY" "disable"
    EndSection
    Section "Module"
        Disable "record"
    EndSection


    Notes:
    1. After disabling X Server extensions, applications requiring those
    extensions may not run.
    2. Only certain extensions can be disabled by the user. To list all
    extensions that can be disabled, the following command can be run:
    $ /usr/X11/bin/Xorg -extension help

    For Xsun(1) server, there is no workaround to the issues described in
    CVE-2008-1377 and CVE-2008-1379.
    To work around the issues for Xsun(1) server with Render support
    enabled on Solaris 10 reported in CVE-2008-2360, CVE-2008-2361 and
    CVE-2008-2362 with Render support enabled, remove the "+xrender"
    option to Xsun.

    On Solaris 9, there is no workaround for the issues reported in
    CVE-2008-2360, CVE-2008-2361 and CVE-2008-2362 for Xsun(1) server.
    The documented issues can be worked around by using the
    "noexec_user_stack" options to defeat the most common form of buffer
    overflow attacks that store executable exploit code on the stack. This
    can be achieved by editing the "/etc/system" file and adding the
    lines:

    set noexec_user_stack = 1
    set noexec_user_stack_log = 1

    A reboot will be necessary in order for the above change to take
    effect. See system(4) for information on modifying the system
    configuration information file.
    The following T-patches are available from
    http://www.sunsolve.sun.com/tpatches:
    SPARC Platform
      * Solaris 8 T-patch T119067-10 (for Xsun(1))
      * Solaris 10 T-patch T119059-44 (for Xsun(1))
      * Solaris 10 T-patch T125719-12 (for Xorg(1))

    x86 Platform
      * Solaris 8 T-patch T119068-10 (for Xsun(1))
      * Solaris 10 T-patch T119060-43 (for Xsun(1))
      * Solaris 10 T-patch T125720-23 (for Xorg(1))

    5. Resolution
    A final resolution is pending completion.

    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 2000-2008 Sun Microsystems, Inc., 4150 Network Circle, Santa
    Clara, CA 95054 U.S.A. All rights reserved

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

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