-----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SuSE Security Announcement Package: syslog-ng Announcement-ID: SuSE-SA:2002:039 Date: Thu Oct 31 11:00:00 MET 2002 Affected products: 7.1, 7.2, 7.3, 8.0, 8.1 SuSE eMail Server III, 3.1 SuSE Linux Firewall on CD/Admin host Vulnerability Type: remote command execution Severity (1-10): 5 SuSE default package: no Cross References: http://www.balabit.hu/static/zsa/ZSA-2002-014-en.txt, CAN-2002-0972 Content of this advisory: 1) security vulnerability resolved: Buffer overflow in syslog-ng. problem description, discussion, solution and upgrade information 2) pending vulnerabilities, solutions, workarounds: - tomcat - apache scoreboard - groff 3) standard appendix (further information) ______________________________________________________________________________ 1) problem description, brief discussion, solution, upgrade information The syslog-ng package is a portable syslog implementation which can be used as syslogd replacement. Syslog-ng contained buffer overflows in its macro expansion routines. These overflows could be triggered by remote attackers if certain configuration options were enabled. Syslog-ng is not used by default on SuSE Linux, and even if installed, the problematic options are not enabled by default. We recommend an update of the syslog-ng package nevertheless if you use syslog-ng for logging. To be sure the update takes effect you have to restart the daemon by issuing the following command as root: /etc/init.d/syslog-ng restart We would like to thank Balazs Scheidler for offering fixes for this problem. 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. i386 Intel Platform: SuSE-8.1 ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/syslog-ng-1.4.14-321.i586.rpm 3e18ad784051e4bbfdcb543d39dab688 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/syslog-ng-1.4.14-321.src.rpm aa51cb8a4208eda4b25c6a1269d74295 SuSE-8.0 ftp://ftp.suse.com/pub/suse/i386/update/8.0/n4/syslog-ng-1.4.14-319.i386.rpm 183db354ceea66a48982b795436a0b57 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/syslog-ng-1.4.14-319.src.rpm c24798a52b9893b24e4cae4b890dcf0e SuSE-7.3 ftp://ftp.suse.com/pub/suse/i386/update/7.3/n2/syslog-ng-1.4.12-72.i386.rpm 9c10c9d8f3607a4f9d13ec0e31afb0b0 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/syslog-ng-1.4.12-72.src.rpm 03927a5ccff05e0171dcb0544969a162 SuSE-7.2 ftp://ftp.suse.com/pub/suse/i386/update/7.2/n2/syslog-ng-1.4.11-89.i386.rpm a2540127cd93a8c99304e9dbb79b9906 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/syslog-ng-1.4.11-89.src.rpm 09d479f8a75d6fed30da3939ad1d7f39 SuSE-7.1 ftp://ftp.suse.com/pub/suse/i386/update/7.1/n2/syslog-ng-1.4.11-88.i386.rpm 8079c939882b955703a9001aa68e2f11 source rpm: ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/syslog-ng-1.4.11-88.src.rpm a97ddbad6908356758259a19449dbed4 Sparc Platform: SuSE-7.3 ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n2/syslog-ng-1.4.12-30.sparc.rpm 5dbb12897f09b73a150c3c7930431a55 source rpm: ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/syslog-ng-1.4.12-30.src.rpm db05461d6a2b06cb527b18169c252a4a AXP Alpha Platform: SuSE-7.1 ftp://ftp.suse.com/pub/suse/axp/update/7.1/n2/syslog-ng-1.4.11-26.alpha.rpm 961b56ba9ed92a79f8c986c92c64a5d7 source rpm: ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/syslog-ng-1.4.11-26.src.rpm 914b26fba99632bf4b5e86dd852927ac PPC Power PC Platform: SuSE-7.3 ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n2/syslog-ng-1.4.12-57.ppc.rpm 8bbb6ab7c32def35ef39e926b089c2bc source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/syslog-ng-1.4.12-57.src.rpm 85527a7be7d81d739a55be1241cc1b3b SuSE-7.1 ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n2/syslog-ng-1.4.11-30.ppc.rpm 3e923a2fc855031eba588d5db83a12f0 source rpm: ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/syslog-ng-1.4.11-30.src.rpm 8cdd6e6279b2586b639cfbd0d424a052 ______________________________________________________________________________ 2) Pending vulnerabilities in SuSE Distributions and Workarounds: - tomcat/jakarta Remote attackers can obtain the sourcecode of JSP files on unpatched servers. This has been fixed in the new tomcat packages. The README.SuSE file of the tomcat package contains further information regarding secure configuration of the tomcat server. To ensure a certain level of security we recommend to disable the invoker servlet. - apache (CAN-2002-0839) Prior to Apache 1.3.27, the shared memory segment containing the "score board" was writable by user "wwwrun". This meant that users able to install CGI scripts etc in a location where they will be executed by apache were able to modify the contents of this scoreboard. This can be exploited to cause apache to send the SIGUSR1 signal to arbitrary processes or arbitrarily spawn new apache children. This update package contains a patch fixing this problem. - groff Someone hyped a format string bug in pic (which is part of the groff package) already known since August 2001. Fixes have been pusblished at about the same time. The groff packages in SuSE products have the fix for this problem since SLES7 (SuSE Linux Enterprise Server, Version 7), appeared in August 2001, and all newer products. _____________________________________________________________________________ 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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