-----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: sendmail, sendmail-tls Announcement-ID: SuSE-SA:2003:013 Date: Monday, March 3rd 2003, 18:10 MET Affected products: 7.1, 7.2, 7.3, 8.0, 8.1 SuSE Linux Database Server, SuSE Linux Enterprise Server 7, 8 SuSE Linux Firewall on CD/Admin host SuSE Linux Connectivity Server SuSE Linux Office Server Vulnerability Type: local privilege escalation Severity (1-10): 7 SuSE default package: yes (until SuSE Linux 8.0 and SLES7) Cross References: http://www.cert.org/advisories/CA-2003-07.html Content of this advisory: 1) security vulnerability resolved: sendmail problem description, discussion, solution and upgrade information 2) pending vulnerabilities, solutions, workarounds: - vnc - w3m 3) standard appendix (further information) ______________________________________________________________________________ 1) problem description, brief discussion, solution, upgrade information sendmail is the most widely used mail transport agent (MTA) in the internet. A remotely exploitable buffer overflow has been found in all versions of sendmail that come with SuSE products. These versions include sendmail-8.11 and sendmail-8.12 releases. sendmail is the MTA subsystem that is installed by default on all SuSE products up to and including SuSE Linux 8.0 and the SuSE Linux Enterprise Server 7. The vulnerability is triggered by an email message sent through the sendmail MTA subsystem. In that respect, it is different from commonly known bugs that occur in the context of an open TCP connection. By consequence, the vulnerability also exists if email messages get forwarded over a relay that itself does not run a vulnerable MTA. This specific detail and the wide distribution of sendmail in the internet causes this vulnerability to be considered an error of major severity. The buffer overflow happens on the heap and is known to be exploitable. As of the writing of this announcement, there is no exploit known to exist in the public. Since there is no known workaround for this vulnerability other than using a different MTA, it is strongly recommended to install the update packages as offered at the locations as listed below. We would like to express our gratitude to Eric Allman for notifying SuSE Security of the problem. The vulnerability was discovered by ISS Internet Security Systems, inc. 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 performing the update, it is necessary to restart all running instances of sendmail using the command "rcsendmail restart" as root. Intel i386 Platform: SuSE-8.1: ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/sendmail-8.12.6-91.i586.rpm 0f3d981ad8e9be64bc70aff474ce303c ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/sendmail-devel-8.12.6-91.i586.rpm afe98a29de75ecd362fad5b02a922856 patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/sendmail-8.12.6-91.i586.patch.rpm ebd8f188748812aff2830b23de6f34b3 ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/sendmail-devel-8.12.6-91.i586.patch.rpm 09ff6834c369051d165d78f01a44d684 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/sendmail-8.12.6-91.src.rpm 50e471df3a90ce4b54b2c5ca3fbc081e SuSE-8.0: ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/sendmail-8.12.3-72.i386.rpm 09e0a8ed5b189c7c819d3d38f74a07e1 ftp://ftp.suse.com/pub/suse/i386/update/8.0/d4/sendmail-devel-8.12.3-72.i386.rpm 72a8c31090299df6b7bd52ea38c31c2b patch rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/sendmail-8.12.3-72.i386.patch.rpm 905b39525ecd0506892b442a204b7aa3 ftp://ftp.suse.com/pub/suse/i386/update/8.0/d4/sendmail-devel-8.12.3-72.i386.patch.rpm a03e4a221c1fb8f2387dc133ada9e604 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/sendmail-8.12.3-72.src.rpm 6e3106de72c4605d379dc2133adba97b SuSE-7.3: ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/sendmail-8.11.6-162.i386.rpm 9d04ffb6a8d6f1fe6e2efe217de69ad7 ftp://ftp.suse.com/pub/suse/i386/update/7.3/sec2/sendmail-tls-8.11.6-164.i386.rpm ebf8d1b2ef233a68b0326e6ce6974994 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/sendmail-8.11.6-162.src.rpm aebf9a30089a13717928e9ba5309a6ed ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/sendmail-tls-8.11.6-164.src.rpm 371e39b10ee7d4c255e96e935c473aa8 SuSE-7.2: ftp://ftp.suse.com/pub/suse/i386/update/7.2/n1/sendmail-8.11.3-106.i386.rpm dbff6db47875bc00a95409cba9498c49 ftp://ftp.suse.com/pub/suse/i386/update/7.2/sec2/sendmail-tls-8.11.3-110.i386.rpm 7c7af39c8179219f6302707ab67bacea source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/sendmail-8.11.3-106.src.rpm 85ff9f88013f6f0b23ed8fb15704bc82 ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/sendmail-tls-8.11.3-110.src.rpm 7502589ff50b89f86398571c5686c23c SuSE-7.1: ftp://ftp.suse.com/pub/suse/i386/update/7.1/n1/sendmail-8.11.2-44.i386.rpm 701f6c5d9748e0b9cd5606cdaaa84cd8 ftp://ftp.suse.com/pub/suse/i386/update/7.1/sec2/sendmail-tls-8.11.2-45.i386.rpm 1583015b284c5166c9bd862c3e24bf14 source rpm(s): ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/sendmail-8.11.2-44.src.rpm b51e8383dc11ca9be65e05ee4209f740 ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/sendmail-tls-8.11.2-45.src.rpm 3de4e382d512f6175cc5050d393d76a0 Sparc Platform: SuSE-7.3: ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n1/sendmail-8.11.6-63.sparc.rpm 0f70b263b09c319dcf698786b14de86f ftp://ftp.suse.com/pub/suse/sparc/update/7.3/sec2/sendmail-tls-8.11.6-63.sparc.rpm e7a3f0c6fadcbaedc9736c2a7a08aa5f source rpm(s): ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/sendmail-8.11.6-63.src.rpm 1a455df96d094008fcd7bc96f49ab938 ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/sendmail-tls-8.11.6-63.src.rpm 20d1fdca82189f4492a1dd28ba0d7e92 AXP Alpha Platform: SuSE-7.1: ftp://ftp.suse.com/pub/suse/axp/update/7.1/n1/sendmail-8.11.2-30.alpha.rpm dfdd75f7e970002742135a5f48c9be71 ftp://ftp.suse.com/pub/suse/axp/update/7.1/sec2/sendmail-tls-8.11.2-37.alpha.rpm ff6d0889f04eff5564c9e498954f9a85 source rpm(s): ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/sendmail-8.11.2-30.src.rpm 92bd9eee0d1b9eac76f4835f4f20dfe2 ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/sendmail-tls-8.11.2-37.src.rpm a5e9e67a860bfd6b873cb9d95134405b PPC Power PC Platform: SuSE-7.3: ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/sendmail-8.11.6-120.ppc.rpm ef7b092c43dddc3fcdfa45946df42232 ftp://ftp.suse.com/pub/suse/ppc/update/7.3/sec2/sendmail-tls-8.11.6-119.ppc.rpm 927355dfa069ad1f032a1036ad65fb2c source rpm(s): ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/sendmail-8.11.6-120.src.rpm 35c672698ccaa213c6e42b2888ac24ad ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/sendmail-tls-8.11.6-119.src.rpm c1ff2ba2174ed85c47fad4149e82e564 SuSE-7.1: ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n1/sendmail-8.11.2-33.ppc.rpm d703b68846212626fdf1e1d3e15c733f ftp://ftp.suse.com/pub/suse/ppc/update/7.1/sec2/sendmail-tls-8.11.2-36.ppc.rpm d98905aaa881fec5684f32ff1d4927de source rpm(s): ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/sendmail-8.11.2-33.src.rpm b582465c56651e15153ad5a0239cea6a ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/sendmail-tls-8.11.2-36.src.rpm f1ef3e9c0f346cf4e7c4f9f70b049878 ______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: - vnc VNC (Virtual Network Computing) uses a weak cookie generation process which can be exploited by an attacker to bypass authentication. New packages are currently being tested and will be available on our FTP servers soon. - w3m The textbased web-browser w3m does not properly escape HTML tags. A malicious HTML page or img alt attribute may lead to information leakage. New packages will be available soon. ______________________________________________________________________________ 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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