===================================================================== 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 ====================================================================== ========================================================= Les serveurs de référence du CERT-Renater http://www.urec.fr/securite http://www.cru.fr/securite http://www.renater.fr ========================================================= + CERT-RENATER | tel : 01-53-94-20-44 + + 151 bd de l'Hopital | fax : 01-53-94-20-41 + + 75013 Paris | email: certsvp@renater.fr + =========================================================