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Date : Fri, 27 Apr 2007 15:49:47 +0200
Type : VULN
Sujet : CERT-Renater : 2007/VULN216 (Sun: Multiple vulnerabilities in libfreetype, Xsun(1) and Xorg(1))
====================================================================                                    CERT-Renater

                         Note d'Information No. 2007/VULN216
_____________________________________________________________________

DATE                      : 27/04 /2007

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : Systems running libfreetype, Xsun(1),
                               libfreetype, Xsun(1), Xorg(1).

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

Sun(sm) Alert Notification
      * Sun Alert ID: 102886
      * Synopsis: Multiple vulnerabilities in libfreetype, Xsun(1) and
        Xorg(1)
      * Category: Security
      * Product: Solaris 9 Operating System, Solaris 10 Operating System,
        Solaris 8 Operating System
      * BugIDs: 6526191, 6538280, 6538290, 6539893, 6526192, 6538282,
        6538286
      * Avoidance: Workaround
      * State: Workaround
      * Date Released: 25-Apr-2007
      * Date Closed:
      * Date Modified:

1. Impact

    Multiple security vulnerabilities exist in the X11 FreeType library
    and  X11 display servers Xsun(1) and Xorg(1).

    The XC-MISC extension is used by the X11 display servers to manage
    resource IDs. A local or remote unprivileged user who is able to
    display data on a running X11 server instance may be able to elevate
    their privileges to root and execute arbitrary code or cause a Denial
    of Service (DOS) to that X11 server instance resulting from memory
    corruption in ProxXCMiscGetXIDList.

    This issue is described in the following documents:

    http://labs.idefense.com/intelligence/vulnerabilities/display.php?i
    dP3

    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1003

    http://lists.freedesktop.org/archives/xorg-announce/2007-April/0002
    86.html

    The X11 display servers contain a flaw that may allow a local or
    remote unprivileged user who is able to display data on a running X11
    server instance to elevate their privileges to root and execute
    arbitrary code or cause a Denial of Service (DOS) to that X11 server
    instance when a BDF font file specifies that there are more then 2^30
    characters defined in the font file.

    This issue is described in the following documents:

    http://labs.idefense.com/intelligence/vulnerabilities/display.php?i
    dP1

    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1351

    http://lists.freedesktop.org/archives/xorg-announce/2007-April/0002
    86.html

    The X11 Free Type library and X11 display servers contain a flaw that
    may allow a local or remote unprivileged user who is able to display
    data on a running X11 server instance to elevate their privileges to
    root and execute arbitrary code or cause a Denial of Service (DOS) to
    that X11 server instance by causing the server to load a long path
    name in the fonts.dir file for a font.

    This issue is described in the following documents:

    http://labs.idefense.com/intelligence/vulnerabilities/display.php?i
    dP2

    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1352

    http://lists.freedesktop.org/archives/xorg-announce/2007-April/000
    286.html

2. Contributing Factors

    These issues can occur in the following releases:

    SPARC Platform
      * Solaris 8
      * Solaris 9
      * Solaris 10

    x86 Platform
      * Solaris 8
      * Solaris 9
      * Solaris 10

    Note: The Xorg(1) X server only ships on the x86 platform for Solaris
    9 with the Sun Java Desktop System (JDS) release 2 installed, and on
    Solaris 10.

    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


3. Symptoms

    There are no predictable symptoms that would indicate the described
    issues have been exploited.

4. Relief/Workaround

    To prevent this issue from being exploited to execute arbitrary
    commands with elevated privileges, the setuid(2) bit can be removed
    from the Xorg server and the Xsun server on the x86 platform and the
    setgid(2) bit can be removed from the Xsun server on the SPARC
    platform. For example:
   # chmod 0755 /usr/openwin/bin/Xsun
   # chmod 0755 /usr/X11/bin/Xorg

    Similar chmod commands will need to be used on a setuid(2) or
    setgid(2) application that links to the Free Type library
    (libfreetype). To determine if a setuid(2) or setgid(2) application
    links to the Free Type library do the following:
   # ldd /usr/bin/fc-cache | grep freetype
   libfreetype.so.6 =>   /usr/sfw/lib/libfreetype.so.6

    If the fc-cache application had been setuid(2) or setgid(2) then
    performing the chmod commands would be appropriate.

    Note 1: Performing the above procedure will disable the following:
      * The ability to start either the Xsun(1) or Xorg(1) server from the
        command line for non-root users on the Solaris x86 platform.
      * The ability of Xsun(1) and Xorg(1) to open Unix domain sockets and
        named pipe transports in the protected "/tmp/.X11-*" directories.
      * The ability to configure Power Management and Interactive Process
        Priority control on Solaris SPARC.

    These features will still be available to Xsun and Xorg when started
    via a display manager such as dtlogin(1), gdm(1), or xdm(1).

    Note 2: There is no workaround to prevent this issue from being
    exploited to cause a Denial Of Service to the X Servers.

    Note 3: The "chmod" command for Xorg(1) is applicable only to Solaris
    9 and 10.

    Note 4: Local users on the console of a system using an X display
    manager and Sun Ray users may still be able to exploit this
    vulnerability to execute arbitrary commands with elevated privileges
    even if the setuid and setgid permissions have been removed from the
    Xsun and Xorg binaries.

5. Resolution

    A final resolution is pending completion.

    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

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

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