===================================================================== CERT-Renater Note d'Information No. 2008/VULN200 _____________________________________________________________________ DATE : 03/06/2008 HARDWARE PLATFORM(S) : / OPERATING SYSTEM(S) : Solaris 9, Solaris 10 running nmbd. ====================================================================== http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-237764-1 ______________________________________________________________________ Solution Type: Sun Alert Solution 237764 : Two Security Vulnerabilities in samba(7) WINS Server Daemon (nmbd) May Allow Execution of Arbitrary Code or Lead to a Denial of Service (DoS) Condition Bug ID: 6630358 Product Solaris 9 Operating System, Solaris 10 Operating System Date of Workaround Release: 30-May-2008 SA Document Body Two Security Vulnerabilities in samba(7) WINS Server Daemon (see details below) 1. Impact Two security vulnerabilities in the samba(7) WINS server daemon (nmbd) may allow a remote unprivileged user to execute arbitrary code with the privileges of the Samba nmbd daemon or lead to a Denial of Service (DoS) to the Samba WINS service. These issues are described in the following documents: * CVE-2007-4572 at: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4572 * CVE-2007-5398 at: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5398 2. Contributing Factors These issues can occur in the following releases: SPARC Platform * Solaris 9 * Solaris 10 without patch 119757-10 x86 Platform * Solaris 9 * Solaris 10 without patch 119758-10 Notes: 1. Solaris 8 does not bundle the Samba software and hence is not affected by these issues. 2. These issues only affect systems running Samba 3.0.0 through 3.0.26a. 3. These issues only impact systems configured as a Samba server running as WINS server. To determine if a system is configured as a Samba server, the following command can be run to check for processes related to Samba: % ps -ef | grep mbd root 317 1 0 May 26 ? 0:01 /usr/sfw/sbin/smbd -D root 325 317 0 May 26 ? 0:00 /usr/sfw/sbin/smbd -D root 314 1 0 May 26 ? 0:27 /usr/sfw/sbin/nmbd -D root 28369 17382 0 23:17:46 pts/2 0:00 grep mbd If the output shows "smbd" or "nmbd" running as a daemon (with the -D parameter), the system is configured as a Samba server. To determine the version of Samba installed on a system, the following command can be run: % /usr/sfw/sbin/smbd -V Version 3.0.4 To determine if the Samba server is running as a Samba WINS server, the following steps may be used: 1. Verify that the process "/usr/sfw/sbin/nmbd -D" is running. This may be done by using the ps(1) command as indicated above. 2. Verify that the "wins support" configuration parameter is set to "yes" in the "/etc/sfw/smb.conf" file. 3. Symptoms If the issue described in CVE-2007-4572 is exploited, the "nmbd" process may hang or the WINS server may stop servicing WINS names. There are no predictable symptoms to indicate that the issue described in CVE-2007-5398 has been exploited to execute arbitrary code. 4. Workaround To work around these issues, stop running the Samba server as a WINS Server. This may achieved by modifying the "wins support" entry in the "/etc/sfw/smb.conf" configuration file to "no". Note: The Samba server must be restarted after making this modification for the changes to take effect. 5. Resolution These issues are addressed in the following releases: SPARC Platform * Solaris 10 with patch 119757-10 or later x86 Platform * Solaris 10 with patch 119758-10 or later A final resolution is pending completion for Solaris 9. 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 + =========================================================