===================================================================== CERT-Renater Note d'Information No. 2005/VULN281 _____________________________________________________________________ DATE : 26/04/2005 HARDWARE PLATFORM(S) : / OPERATING SYSTEM(S) : Solaris 7, Solaris 8, Solaris 9. ====================================================================== Sun(sm) Alert Notification * Sun Alert ID: 57768 * Synopsis: Multiple Security Vulnerabilities in Xsun and Xprt Server Font Handling * Category: Security * Product: Solaris * BugIDs: 4995611, 4989547 * Avoidance: Patch * State: Resolved * Date Released: 18-Apr-2005 * Date Closed: 18-Apr-2005 * Date Modified: 1. Impact Xsun(1), the Solaris server for X Version 11, and Xprt(1), the Solaris print server for X Version 11, contain multiple buffer overflows in the handling of the "font.alias" file which may allow a local unprivileged user to execute arbitrary code with the privileges of the Xsun or Xprt server. The Xsun server runs with "gid root" privileges on Solaris SPARC systems and "uid root" privileges on Solaris x86 systems. The Xprt server runs with "gid root" privileges on both SPARC and x86 systems. This issue is described in the following documents: CVE CAN-2004-0083 at [2]http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0083 CVE CAN-2004-0084 at [3]http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0084 2. Contributing Factors This issue can occur in the following releases: SPARC Platform * Solaris 7 without patch [4]108376-45 * Solaris 8 without patch 108652-80 * Solaris 9 without patch [5]112785-34 x86 Platform * Solaris 7 without patch [6]108377-40 * Solaris 8 without patch 108653-69 * Solaris 9 without patch [7]112786-36 Note: Solaris 10 is not affected by this issue. 3. Symptoms There are no predictable symptoms that would indicate the described issue has been exploited. Solution Summary [8]Top 4. Relief/Workaround To work around the described issue, do the following: 1. Remove the setuid(2) and/or setgid(2) bit from Xsun and Xprt 2. Configure dtlogin(1X) not to run Xsun as "root" 1. To remove the setuid(2) and/or setgid(2) bit from Xsun and Xprt, the following command can be run as "root": # chmod 0755 /usr/openwin/bin/Xsun /usr/openwin/bin/Xprt 2. To configure dtlogin not to run Xsun as "root", copy "/usr/dt/config/Xservers" to "/etc/dt/config/Xservers" and change the following line from: :0 Local local_uid@console root /usr/X11/bin/Xserver :0 -nobanner to :0 Local local@console /usr/openwin/bin/Xsun :0 -nobanner WARNING: Performing the above procedure will disable: * all ability to run Xsun on Solaris x86 * power management and Interactive Process Priority control on Solaris SPARC * Sun Ray support * Xsun and Xprt ability to open Unix domain sockets and named pipe transports in the protected /tmp/.X11-* directories 5. Resolution This issue is addressed in the following releases: SPARC Platform * Solaris 7 with patch [9]108376-45 or later * Solaris 8 with patch 108652-80 or later * Solaris 9 with patch [10]112785-34 or later x86 Platform * Solaris 7 with patch [11]108377-40 or later * Solaris 8 with patch 108653-69 or later * Solaris 9 with patch [12]112786-36 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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References 1. http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-57768-1#top 2. http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0083 3. http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0084 4. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-108376-45-1 5. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-112785-34-1 6. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-108377-40-1 7. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-112786-36-1 8. http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-57768-1#top 9. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-108376-45-1 10. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-112785-34-1 11. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-108377-40-1 12. http://sunsolve.sun.com/search/document.do?assetkey=urn:cds:docid:1-21-112786-36-1 ====================================================================== ========================================================= 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 + =========================================================