-----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: samba, samba-client Announcement-ID: SuSE-SA:2003:015 Date: Wednesday, March 19th 12:00 MET Affected products: 7.1, 7.2, 7.3, 8.0, 8.1 SuSE Linux Database Server SuSE eMail Server 3.1 SuSE eMail Server III SuSE Firewall Adminhost VPN SuSE Linux Admin-CD for Firewall SuSE Firewall on CD 2 - VPN SuSE Firewall on CD 2 SuSE Linux Enterprise Server for S/390 SuSE Linux Connectivity Server SuSE Linux Enterprise Server 7 SuSE Linux Enterprise Server 8 SuSE Linux Office Server Vulnerability Type: remote command execution Severity (1-10): 7 SuSE default package: No Cross References: http://www.samba.org CAN-2003-0085 CAN-2003-0086 Content of this advisory: 1) security vulnerability resolved: buffer overflows and a chown race condition in the smbd server, buffer overflow in the samba client problem description, discussion, solution and upgrade information 2) pending vulnerabilities, solutions, workarounds: - wget 3) standard appendix (further information) ______________________________________________________________________________ 1) problem description, brief discussion, solution, upgrade information Sebastian Krahmer, SuSE Security Team, reviewed security-critical parts of the Samba server within the scope of security audits that the SuSE Security Team conducts on a regular basis for security-critical Open Source Software. Buffer overflows and a chown race condition have been discovered and fixed during the security audit. The buffer overflow vulnerabilitiy allows a remote attacker to execute arbitrary commands as root on the system running samba. In addition to the flaws fixed in the samba server, some overflow conditions in the samba-client package have been fixed with the available update packages. It is strongly recommended to install the update packages on a system where the samba package is used. There exists no temporary workaround against this vulnerability other than shutting down the smbd daemon. We would like to thank the Samba Team, especially Jeremy Allison, Andrew Bartlett and Volker Lendecke for their quick response and cooperation. Please note that the package names for SuSE products vary for different products. There exist the following pairings: server client ---------------------------- samba smbclnt samba samba-client samba-classic samba-classic-client samba-ldap samba-ldap-client To find out which packages are installed on your system, you may run the following command: rpm -qa|egrep '(samba|smbclnt)' Please download the update package for your distribution and verify its integrity by the methods listed in section 3) of this announcement. Then, install the package using the command "rpm -Fhv file.rpm" to apply the update. Our maintenance customers are being notified individually. The packages are being offered to install from the maintenance web. SPECIAL INSTALL INSTRUCTIONS: ============================== After successfully installing the update packages, you should restart the samba server process(es) to make the changes in the system effective. If you do not have a samba server running on your system, no further action is required. If you have a samba server running, please run the following command as root: rcsmb restart Intel i386 Platform: SuSE-8.1: ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/samba-2.2.5-160.i586.rpm deae19fe6dc1fd519c9219e791983128 ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/samba-client-2.2.5-160.i586.rpm dac659a9c774ed1e0f8cea04e5b287ee patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/samba-2.2.5-160.i586.patch.rpm 1fdedee145fd35ad30ef078182bfcdeb ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/samba-client-2.2.5-160.i586.patch.rpm 7bf4707c05c477db610f2a79b48b51a5 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/samba-2.2.5-160.src.rpm f62e0b9ffb00058ec4be67746903a4cc SuSE-8.0: ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/samba-2.2.3a-169.i386.rpm 519550b7d4a52f63ca858f1f58c283aa ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/samba-client-2.2.3a-169.i386.rpm daeb00edf26acfcbad92bae602689d42 patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/samba-2.2.3a-169.i386.patch.rpm faf4c352d880b1f1be4baa3e8079243f ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/samba-client-2.2.3a-169.i386.patch.rpm 7bbcc81d79bebff8103c37f8cb8565dc source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/samba-2.2.3a-169.src.rpm daf838ccb337ca0863c65a9439e7ef7a SuSE-7.3: ftp://ftp.suse.com/pub/suse/i386/update/7.3/n2/samba-2.2.1a-213.i386.rpm 368e2d0190b4520965a79bf836eaaa2d ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/samba-client-2.2.1a-213.i386.rpm 06070925fd5cb40bc3f2985a5d64eff1 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/samba-2.2.1a-213.src.rpm af94d5ba0977e69de416fef54980a04d SuSE-7.2: ftp://ftp.suse.com/pub/suse/i386/update/7.2/n2/samba-2.2.0a-48.i386.rpm 6300d1278311145e69522d58bde5aaf8 ftp://ftp.suse.com/pub/suse/i386/update/7.2/n1/smbclnt-2.2.0a-48.i386.rpm 2553481e90b85a616c25580eb2875ea4 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/samba-2.2.0a-48.src.rpm 0d7397de281f100163fa105c972b387d SuSE-7.1: ftp://ftp.suse.com/pub/suse/i386/update/7.1/n2/samba-2.0.10-27.i386.rpm 1eb26f1ef80681ec479a9028d51647bf ftp://ftp.suse.com/pub/suse/i386/update/7.1/n1/smbclnt-2.0.10-27.i386.rpm fa2a4d306536dd90a31677487996f2e0 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/samba-2.0.10-27.src.rpm 1cd317f5749de96e432fee19310ea6f6 Sparc Platform: SuSE-7.3: ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n2/samba-2.2.1a-73.sparc.rpm 9e140d7fe66015dfbb7f9b9edce5f91e ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n1/samba-client-2.2.1a-73.sparc.rpm 632d72c89565cc90be8e02b50d3cdb9a source rpm(s): ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/samba-2.2.1a-73.src.rpm eea5157ce34ff8cb959ed46c144dd96f AXP Alpha Platform: SuSE-7.1: ftp://ftp.suse.com/pub/suse/axp/update/7.1/n2/samba-2.0.10-21.alpha.rpm 046c7de92587d7a1c30d915b72e176bc ftp://ftp.suse.com/pub/suse/axp/update/7.1/n1/smbclnt-2.0.10-21.alpha.rpm 12e9b05050a1610ba03f5338c6f92b82 source rpm(s): ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/samba-2.0.10-21.src.rpm 79359cbca70ec1fb8a425e5b9a7eb00c PPC Power PC Platform: SuSE-7.3: ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n2/samba-2.2.1a-147.ppc.rpm bd367591e2df9061baa618d6a78c84b1 ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/samba-client-2.2.1a-147.ppc.rpm b05f69057a35abde3e2c19aa456f8467 source rpm(s): ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/samba-2.2.1a-147.src.rpm d990a6b247a6a38eaaeaef06f71269ea SuSE-7.1: ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n2/samba-2.0.10-21.ppc.rpm 5dc1f1d9337a5241cb35e7179e8fb28b ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n1/smbclnt-2.0.10-21.ppc.rpm 76263c619a4d05ef4f4de4f9813a0a72 source rpm(s): ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/samba-2.0.10-21.src.rpm be112406b4fff2b5e4a08a67a2411919 ______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: - wget New wget packages are available which filter certain characters such as .. and / in filenames to ensure evil servers cannot overwrite important system-files or files outside the current directory. ______________________________________________________________________________ 3) standard appendix: authenticity verification, additional information - Package authenticity verification: SuSE update packages are available on many mirror ftp servers all over the world. While this service is being considered valuable and important to the free and open source software community, many users wish to be sure about the origin of the package and its content before installing the package. There are two verification methods that can be used independently from each other to prove the authenticity of a downloaded file or rpm package: 1) md5sums as provided in the (cryptographically signed) announcement. 2) using the internal gpg signatures of the rpm package. 1) execute the command md5sum <name-of-the-file.rpm> after you downloaded the file from a SuSE ftp server or its mirrors. Then, compare the resulting md5sum with the one that is listed in the announcement. Since the announcement containing the checksums is cryptographically signed (usually using the key security@suse.de), the checksums show proof of the authenticity of the package. We disrecommend to subscribe to security lists which cause the email message containing the announcement to be modified so that the signature does not match after transport through the mailing list software. Downsides: You must be able to verify the authenticity of the announcement in the first place. If RPM packages are being rebuilt and a new version of a package is published on the ftp server, all md5 sums for the files are useless. 2) rpm package signatures provide an easy way to verify the authenticity of an rpm package. Use the command rpm -v --checksig <file.rpm> to verify the signature of the package, where <file.rpm> is the filename of the rpm package that you have downloaded. Of course, package authenticity verification can only target an un-installed rpm package file. Prerequisites: a) gpg is installed b) The package is signed using a certain key. The public part of this key must be installed by the gpg program in the directory ~/.gnupg/ under the user's home directory who performs the signature verification (usually root). You can import the key that is used by SuSE in rpm packages for SuSE Linux by saving this announcement to a file ("announcement.txt") and running the command (do "su -" to be root): gpg --batch; gpg < announcement.txt | gpg --import SuSE Linux distributions version 7.1 and thereafter install the key "build@suse.de" upon installation or upgrade, provided that the package gpg is installed. The file containing the public key is placed at the top-level directory of the first CD (pubring.gpg) and at ftp://ftp.suse.com/pub/suse/pubring.gpg-build.suse.de . - SuSE runs two security mailing lists to which any interested party may subscribe: suse-security@suse.com - general/linux/SuSE security discussion. All SuSE security announcements are sent to this list. To subscribe, send an email to <suse-security-subscribe@suse.com>. suse-security-announce@suse.com - SuSE's announce-only mailing list. Only SuSE's security announcements are sent to this list. To subscribe, send an email to <suse-security-announce-subscribe@suse.com>. For general information or the frequently asked questions (faq) send mail to: <suse-security-info@suse.com> or <suse-security-faq@suse.com> respectively. ===================================================================== SuSE's security contact is <security@suse.com> or <security@suse.de>. The <security@suse.de> public key is listed below. ===================================================================== ______________________________________________________________________________ The information in this advisory may be distributed or reproduced, provided that the advisory is not modified in any way. In particular, it is desired that the clear-text signature shows proof of the authenticity of the text. SuSE Linux AG makes no warranties of any kind whatsoever with respect to the information contained in this security advisory. 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