__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN dtsession(1X) Contains a Buffer Overflow Vulnerability [Sun Alert ID: 102954] June 28, 2007 18:00 GMT Number R-289 ______________________________________________________________________________ PROBLEM: 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. PLATFORM: Solaris 8, 9, 10 Operating Systems DAMAGE: Execute arbitrary code or commands with the privileges of the dtsession(1X) Common Desktop Environment (CDE) Session Manager. SOLUTION: Upgrade to the appropriate version. ______________________________________________________________________________ VULNERABILITY The risk is MEDIUM. An unprivileged local user may be able to ASSESSMENT: execute arbitrary code or commands with the privileges of the dtsession(1X) Common Desktop Environment (CDE) Session Manager. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/r-289.shtml ORIGINAL BULLETIN: http://www.sunsolve.sun.com/search/document.do?assetkey=1 -26-102954-1 ______________________________________________________________________________ [***** Start Sun Alert ID: 102954 *****] 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. Solution Summary Top 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 WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. 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[***** End Sun Alert ID: 102954 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Sun Microsystems for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. 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