-----BEGIN PGP SIGNED MESSAGE----- ______________________________________________________________________________ SUSE Security Summary Report Announcement-ID: SUSE-SR:2004:003 Date: Tuesday, Dec 7th 2004 15:00 MEST Cross References: CAN-2004-0782 CAN-2004-0883 CAN-2004-0947 CAN-2004-1010 CAN-2004-1011 CAN-2004-1012 CAN-2004-1013 CAN-2004-1070 CAN-2004-1071 CAN-2004-1072 CAN-2004-1073 CAN-2004-1074 Content of this advisory: 1) solved security vulnerabilities: - kernel problems - cyrus-imapd remote problems - imlib image loader problems - unarj directory traversal and buffer overflow - zip buffer overflow problem 2) pending vulnerabilities, solutions, workarounds: - Sun and Blackdown Java - new kernel problems 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. - kernel Several problems have been found in the Linux 2.4 and 2.6 kernels: - Several issues have been found in the error handling of the ELF loader routines by Paul Starzetz of isec.pl. These are tracked by the Mitre CVE Ids: CAN-2004-1070,CAN-2004-1071,CAN-2004-1072 CAN-2004-1073. - Several overflow checks in the smbfs handling of both Linux 2.4 and 2.6 were found missing by Stefan Esser. This is tracked by the Mitre CVE Id CAN-2004-0883. - Handcrafted a.out binaries could be used to trigger a local denial of service condition in both 2.4 and 2.6 Linux kernels. Fixes for this problem were done by Chris Wright. This is tracked by the Mitre CVE Id CAN-2004-1074. - A very small race window was found in the memory management of the kernel which could be used to show the content of random physical memory pages potentially leading to information disclosure. This is already fixed in the mainline kernel. These bugs affect all SUSE Linux products. A separate advisory has already gone out for this issue. - cyrus-imapd Remote buffer overflow possibilities in the Cyrus IMAP daemon were found by Stefan Esser and Sebastian Krahmer. These are tracked by the Mitre CVE IDs CAN-2004-1011, CAN-2004-1012, and CAN-2004-1013. All SUSE Linux based products are affected. A separate advisory has already gone out for this issue. - imlib A review of the Fedora Core team found more problems in the imlib source code. Patches to fix these problems have been applied. These are related to the vulnerability tracked in the Mitre CVE ID CAN-2004-0782 for which we already released updated packages. All SUSE Linux based products are affected. - unarj A directory traversal problem in the unpacker unarj was reported which allows an attacker to overwrite files outside of the current directory. Additionally Ludwig Nussel of SUSE found some buffer overflow problems during extraction allowing an handwritten arj archive to potentially execute code. The buffer overflow is tracked by the Mitre CVE ID CAN-2004-0947. All SUSE Linux based products are affected. - zip A buffer overflow in the unpacker zip was reported, which potentially allows an attacker with a handcrafted ZIP archive to remotely execute code. This is tracked by the Mitre CVE ID CAN-2004-1010. All SUSE Linux based products are affected. ______________________________________________________________________________ 2) Pending vulnerabilities in SUSE Distributions and Workarounds: - Sun Java Plugin A privilege escalation problem was found in the Sun Java Plugin which could have a remote attacker reading and writing files of a local user browsing websites. This bug affects all SUSE versions on the Intel x86 and AMD64 / Intel Extended Memory Architecture (EM64T) platforms. We are in the process of releasing updated Java packages. - kernel Several more problems have been found in the Linux 2.4 and 2.6 kernels: - A race condition in the unix_dgram_recvmsg() could lead to a local attacker overwriting kernel memory. This is tracked by the Mitre CVE ID CAN-2004-1068. - Local denial of service in aio_free_ring(). - Local denial of service with badly formed ELF executables on 64 bit systems. - Some more minor issues. All SUSE Linux based products are affected and we are in the process of preparing updated packages. ______________________________________________________________________________ 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 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@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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