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May 2005

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SUSE Security Summary Report (SUSE-SR:2005:013)
by Ludwig Nussel 18 May '05

18 May '05

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ______________________________________________________________________________ SUSE Security Summary Report Announcement-ID: SUSE-SR:2005:013 Date: Wed, 18 May 2005 15:00:00 +0000 Cross References: CAN-2005-1046 CAN-2005-1195 CAN-2005-1263 CAN-2005-1349 CAN-2005-1409 CAN-2005-1410 Content of this advisory: 1) solved security vulnerabilities: - xine buffer overflow - kimgio buffer overflows 2) pending vulnerabilities, solutions, workarounds: - perl-Net-Server format string bug - perl-Convert-UUlib - postgresql - kernel 3) standard appendix (further information) ______________________________________________________________________________ 1) solved security vulnerabilities To avoid spamming lists with advisories for every small incident, we will release weekly summary advisories for issues where we have released updates without a full advisory. Since these are minor issues, md5sums and ftp urls are not included. Fixed packages for the following incidents are already available on our FTP server and via the YaST Online Update. - xine buffer overflow Buffer overflows in the code used to handle MMST streams or RealMedia RTSP streams allow remote malicious servers to execute arbitrary code. This is tracked by the Mitre CVE ID CAN-2005-1195 All SUSE Linux based products are affected. - kimgio buffer overflows Buffer overflows in the kimgio library of KDE potentially allows remote attackers to execute arbitrary code though specially crafted image files. This is tracked by the Mitre CVE ID CAN-2005-1046 All SUSE Linux based products are affected. ______________________________________________________________________________ 2) Pending vulnerabilities in SUSE Distributions and Workarounds: - perl-Net-Server format string bug A format string problem was found in the logging routines of the perl-Net-Server perl module collection. All SUSE Linux products are affected. - perl-Convert-UUlib A buffer overflow could allow an attacker to execute arbitrary code. This is tracked by the Mitre CVE ID CAN-2005-1349 All SUSE LINUX based products are affected - postgresql Two security errors in PostgreSQL may allow an unprivileged database user to crash the backend process or allow an unprivileged user to gain the privileges of a database superuser. To fix those problems please carefully read the instructions on http://www.postgresql.org/about/news.315 This is tracked by the Mitre CVE IDs CAN-2005-1409 and CAN-2005-1410 All SUSE LINUX based products except for SLES8 are affected. - kernel Paul Starzetz discovered a flaw in the kernel's elf_core_dump() function which could allow unprivileged local users to gain root access by causing a specially crafted process to dump core. An attack can be prevented by setting a hard ulimit for the core dump size to zero. The 2.6 series of kernels does not seem to be vulnerable. We are about to prepare updates for all SUSE Linux based products nevertheless. This is tracked by the Mitre CVE ID CAN-2005-1263 ______________________________________________________________________________ 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(a)suse.de), the checksums show proof of the authenticity of the package. We recommend against subscribing to security lists that cause the e-mail 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 file name of the rpm package that you have downloaded. Of course, package authenticity verification can only target an uninstalled 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(a)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(a)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(a)suse.com>. suse-security-announce(a)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(a)suse.com>. For general information or the frequently asked questions (FAQ) send mail to: <suse-security-info(a)suse.com> or <suse-security-faq(a)suse.com> respectively. ===================================================================== SUSE's security contact is <security(a)suse.com> or <security(a)suse.de>. The <security(a)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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