-----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: samba Announcement-ID: SuSE-SA:2002:045 Date: Wednesday, November 20th 2002 16:00 MET Affected products: 7.2, 7.3, 8.0, 8.1 SuSE Linux Database Server, SuSE eMail Server III, 3.1 SuSE Linux Enterprise Server 7+8, SuSE Linux Firewall on CD/Admin host SuSE Linux Connectivity Server SuSE Linux Office Server Vulnerability Type: possible remote code execution Severity (1-10): 7 SuSE default package: no Cross References: http://www.samba.org/ Content of this advisory: 1) security vulnerability resolved: samba problem description, discussion, solution and upgrade information 2) pending vulnerabilities, solutions, workarounds 3) standard appendix (further information) ______________________________________________________________________________ 1) problem description, brief discussion, solution, upgrade information Samba developer Steve Langasek found a security problem in samba, the widely known free implementation of the SMB protocol. The error consists of a buffer overflow in a commonly used routine that accepts user input and may write up to 127 bytes past the end of the buffer allocated with static length, leaving enough room for an exploit. The resulting vulnerability can be exploited locally in applications using the pam_smbpass Pluggable Authentication Module (PAM). It may be possible to exploit this vulnerability remotely, causing the running smbd to crash or even to execute arbitrary code. The samba package is installed by default only on the SuSE Linux Enterprise Server. SuSE Linux products do not have the samba and samba-client packages installed by default. The samba packages in SuSE Linux version 7.1 and before are not affected by this vulnerability. For the bug to be exploited, your system has to be running the smbd samba server, or an administrator must have (manually) changed the configuration of the PAM authentification subsystem to enable the use of the pam_smbpass module. The samba server process(es) are not activated automatically after installation (of the package). The samba subsystem on SuSE products is split into two different subpackages: samba and smbclnt up to and including SuSE Linux 7.2, on SuSE Linux 7.3 and newer the package names are samba and samba-client. To completely remove the vulnerability, you should update all of the installed packages. We wish to express our gratitude to the samba development team and in particular to Steve Langasek and Volker Lendecke who provided the patches and communicated them to the vendors. Please know that the samba team will release the new version 2.2.7 of the samba software to address the security fix at the same time as this announcement gets published. More information about samba (and the security fix) is available at http://www.samba.org. 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 # SuSE Linux, all versions rcnmb restart # only on SuSE Linux 8.1 Intel i386 Platform: SuSE-8.1: ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/samba-2.2.5-124.i586.rpm f0a94ef6cc49165d4dace59caaf359d7 ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/samba-client-2.2.5-124.i586.rpm f694fb4aaabffa98b6a76941cb2c0eaf patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/samba-2.2.5-124.i586.patch.rpm af43bc1d5dc1b097389933f34ca5a625 ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/samba-client-2.2.5-124.i586.patch.rpm bff278f9366df7efe72fa880c4f7618f source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/samba-2.2.5-124.src.rpm 674adb466663259c2117852b9525a29a SuSE-8.0: ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/samba-2.2.3a-165.i386.rpm 8c7edd09c5acfc269467ecbcdcdfc21c ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/samba-client-2.2.3a-165.i386.rpm bfc08a1d64f0d85670041c7046d1e775 patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.0/n2/samba-2.2.3a-165.i386.patch.rpm 7d08c2c07137d9da0b3d1a301295a084 ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/samba-client-2.2.3a-165.i386.patch.rpm 887230d4ed61bec496dff73c50fa3de0 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/samba-2.2.3a-165.src.rpm b208c4d5bcceb7f9cc18df75b7831d2d SuSE-7.3: ftp://ftp.suse.com/pub/suse/i386/update/7.3/n2/samba-2.2.1a-206.i386.rpm dc4232333a0babbb257cff346609625f ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/samba-client-2.2.1a-206.i386.rpm 163a565a5a0b0320eae6ba1d0ebdfb27 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/samba-2.2.1a-206.src.rpm 6086e3bb296a320c28fced9068c931fc SuSE-7.2: ftp://ftp.suse.com/pub/suse/i386/update/7.2/n2/samba-2.2.0a-45.i386.rpm 184b17987ca99325782f4c7f9e04b6a6 ftp://ftp.suse.com/pub/suse/i386/update/7.2/n1/smbclnt-2.2.0a-45.i386.rpm b9926ade015ccaf271088da246814abb source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/samba-2.2.0a-45.src.rpm 384ec49b0b8a81d8ecf7c84ef0fa2689 Sparc Platform: SuSE-7.3: ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n2/samba-2.2.1a-69.sparc.rpm 61b72787bc8e0b333662962a60bce0c2 ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n1/samba-client-2.2.1a-69.sparc.rpm 6acd0ffd218d721d7c10b17e1194738d source rpm(s): ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/samba-2.2.1a-69.src.rpm 77f57a3277bb1a270ae79bc94ee28345 PPC Power PC Platform: SuSE-7.3: ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n2/samba-2.2.1a-141.ppc.rpm d127afabc7d5b764289f9b65ad4c4cd1 ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/samba-client-2.2.1a-141.ppc.rpm 894132f3b5041a54ec871d67eef072e5 source rpm(s): ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/samba-2.2.1a-141.src.rpm ccff812fdddd3af9d62a399f63e0405e ______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: - 7.0 update trees We will move the SuSE Linux 7.0 update tree structure to the /pub/suse/discontinued/ tree shortly, following the announcement about discontinued products on Tue, 29 Oct 2002. ______________________________________________________________________________ 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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