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                                   CERT-Renater

                        Note d'Information No. 2007/VULN274
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DATE                      : 03/07/2007

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : Solaris 8, Solaris 9, Solaris 10.

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Sun(sm) Alert Notification
     * Sun Alert ID: 102954
     * Synopsis: dtsession(1X) Contains a Buffer Overflow Vulnerability
     * Category: Security
     * Product: Solaris 9 Operating System, Solaris 10 Operating System,
       Solaris 8 Operating System
     * BugIDs: 6547678
     * Avoidance: Patch, Workaround
     * State: Resolved
     * Date Released: 27-Jun-2007
     * Date Closed: 27-Jun-2007
     * Date Modified:

1. Impact

   An unprivileged local user may be able to execute arbitrary code or
   commands with the privileges of the dtsession(1X) Common Desktop
   Environment (CDE) Session Manager. The dtsession(1X) CDE Session
   Manager runs with root privileges.

2. Contributing Factors

   This issue can occur in the following releases:

   SPARC Platform
     * Solaris 8 without patch 109354-26
     * Solaris 9 without patch 113240-13
     * Solaris 10 without patch 125279-02

   x86 Platform
     * Solaris 8 without patch 109355-25
     * Solaris 9 without patch 113241-13
     * Solaris 10 without patch 125280-02

3. Symptoms

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

4. Relief/Workaround

   To work around the described issue, turn off the set-user-ID
   ("setuid") bit for dtsession(1X) as root:
    #chmod 0555 /usr/dt/bin/dtsession

   Note 1: For CDE users this will cause dtsession(1X) to be unable to
   unlock the screen by the list of keyholders (including root) as well
   as prevent users with accounts defined in /etc/passwd to be unable to
   unlock the screen. CDE users with accounts defined in NIS, NIS+, or
   LDAP will still be able to unlock the screen.

   Note 2: CDE users with accounts defined in /etc/passwd should use
   xlock(1) to lock their X display and turn off automatic session
   locking by dtsession(1X). Automatic session locking by dtsession(1X)
   can be turned off using the CDE Style Manager's (dtstyle(1X)) screen
   option. From the dtstyle(1X) screen option window, automatic session
   locking can be turned off by selecting "off" for the Screen Saver and
   Screen Lock options. To lock the X display using xlock(1) the xlock(1)
   command can be executed from the command line of a terminal window.

5. Resolution

   This issue is addressed in the following releases:

   SPARC Platform
     * Solaris 8 with patch 109354-26 or later
     * Solaris 9 with patch 113240-13 or later
     * Solaris 10 with patch 125279-02 or later

   x86 Platform
     * Solaris 8 with patch 109355-25 or later
     * Solaris 9 with patch 113241-13 or later
     * Solaris 10 with patch 125280-02 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
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   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
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   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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