Kernel Update for SUSE Linux
Posted on: 06/16/2004 09:43 AM

A kernel update has been released for SUSE Linux: ______________________________________________________________________________ SUSE Security Announcement Package: kernel Announcement-ID: SuSE-SA:2004:017 Date: Wednesday, Jun 16th 2004 15:20 MEST Affected products: 8.0, 8.1, 8.2, 9.0, 9.1 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: local denial-of-service attack Severity (1-10): 4 SUSE default package: no Cross References: CAN-2004-0554 Content of this advisory: 1) security vulnerability resolved: - floating point exception causes system crash problem description, discussion, solution and upgrade information 2) pending vulnerabilities, solutions, workarounds: - icecast - sitecopy - cadaver - OpenOffice_org - tripwire - postgresql - lha - XDM - mod_proxy 3) standard appendix (further information) ______________________________________________________________________________

1) problem description, brief discussion, solution, upgrade information The Linux kernel is vulnerable to a local denial-of-service attack. By using a C program it is possible to trigger a floating point exception that puts the kernel into an unusable state. To execute this attack a malicious user needs shell access to the victim's machine. The severity of this bug is considered low because local denial-of- service attacks are hard to prevent in general. Additionally the bug is limited to x86 and x86_64 architecture. SPECIAL INSTALL INSTRUCTIONS: ======================= ======= The following paragraphs will guide you through the installation process in a step-by-step fashion. The character sequence "****" marks the beginning of a new paragraph. In some cases, the steps outlined in a particular paragraph may or may not be applicable to your situation. Therefore, please make sure to read through all of the steps below before attempting any of these procedures. All of the commands that need to be executed are required to be run as the superuser (root). Each step relies on the steps before it to complete successfully. Note: The update packages for the SuSE Linux Enterprise Server 7 (SLES7) are being tested at the moment and will be published as soon as possible. **** Step 1: Determine the needed kernel type Please use the following command to find the kernel type that is installed on your system: rpm -qf /boot/vmlinuz Following are the possible kernel types (disregard the version and build number following the name separated by the "-" character) k_deflt # default kernel, good for most systems. k_i386 # kernel for older processors and chipsets k_athlon # kernel made specifically for AMD Athlon(tm) family proces sors k_psmp # kernel for Pentium-I dual processor systems k_smp # kernel for SMP systems (Pentium-II and above) k_smp4G # kernel for SMP systems which supports a maximum of 4G of RAM kernel-64k-pagesize kernel-bigsmp kernel-default kernel-smp **** Step 2: Download the package for your system Please download the kernel RPM package for your distribution with the name as indicated by Step 1. The list of all kernel rpm packages is appended below. Note: The kernel-source package does not contain a binary kernel in bootable form. Instead, it contains the sources that the binary kernel rpm packages are created from. It can be used by administrators who have decided to build their own kernel. Since the kernel-source.rpm is an installable (compiled) package that contains sources for the linux kernel, it is not the source RPM for the kernel RPM binary packages. The kernel RPM binary packages for the distributions can be found at th e locations below 8.0/images/ 8.1/rpm/i586 8.2/rpm/i586 9.0/rpm/i586 9.1/rpm/i586 After downloading the kernel RPM package for your system, you should verify the authenticity of the kernel rpm package using the methods as listed in section 3) of each SUSE Security Announcement. **** Step 3: Installing your kernel rpm package Install the rpm package that you have downloaded in Steps 3 or 4 with the command rpm -Uhv --nodeps --force where is the name of the rpm package that you downloaded. Warning: After performing this step, your system will likely not be able to boot if the following steps have not been fully followed. If you run SUSE LINUX 8.1 and haven't applied the kernel update (SUSE-SA:2003:034), AND you are using the freeswan package, you also need to update the freeswan rpm as a dependency as offered by YOU (YaST Online Update). The package can be downloaded from **** Step 4: configuring and creating the initrd The initrd is a ramdisk that is loaded into the memory of your system together with the kernel boot image by the bootloader. The kernel uses the content of this ramdisk to execute commands that must be run before the kernel can mount its actual root filesystem. It is usually used to initialize SCSI drivers or NIC drivers for diskless operation. The variable INITRD_MODULES in /etc/sysconfig/kernel determines which kernel modules will be loaded in the initrd before the kernel has mounted its actual root filesystem. The variable should contain your SCSI adapter (if any) or filesystem driver modules. With the installation of the new kernel, the initrd has to be re-packed with the update kernel modules. Please run the command mk_initrd as root to create a new init ramdisk (initrd) for your system. On SuSE Linux 8.1 and later, this is done automatically when the RPM is installed. **** Step 5: bootloader If you run a SUSE LINUX 8.x, SLES8, or SUSE LINUX 9.x system, there are two options: Depending on your software configuration, you have either the lilo bootloader or the grub bootloader installed and initialized on your system. The grub bootloader does not require any further actions to be performed after the new kernel images have been moved in place by the rpm Update command. If you have a lilo bootloader installed and initialized, then the lilo program must be run as root. Use the command grep LOADER_TYPE /etc/sysconfig/bootloader to find out which boot loader is configured. If it is lilo, then you must run the lilo command as root. If grub is listed, then your system does not require any bootloader initialization. Warning: An improperly installed bootloader may render your system unbootable. **** Step 6: reboot If all of the steps above have been successfully completed on your system, then the new kernel including the kernel modules and the initrd should be ready to boot. The system needs to be rebooted for the changes to become active. Please make sure that all steps have completed, then reboot using the command shutdown -r now or init 6 Your system should now shut down and reboot with the new kernel. There is no workaround known. 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 appl y the update. Our maintenance customers are being notified individually. The packages are being offered to install from the maintenance web. Intel i386 Platform: SuSE-9.1: 5-7.75.i586.rpm 8d11469e1815c5b2fa143fce62c17b95 .5-7.75.i586.rpm 75222182ad4c766b6482e5b83658819d .75.i586.rpm 45f1244f153ab1387a9dc67e7bcf20bb 5-7.75.i586.rpm 517647d955770503fe61ae2549c453dd source rpm(s): -7.75.src.rpm 9103503f430b9d854630ecb8855a2fb3 5-7.75.nosrc.rpm 9381c56f1f64835c5379dde278ac768d 75.nosrc.rpm 4f47dc2be58f5315cf596c051c2892b5 -7.75.nosrc.rpm 732c1e7d2a9e41780464eccdc0d54505 SuSE-9.0: 21-226.i586.rpm 7b6022e2f80325b42fa7dc3188360530 6.i586.rpm 594efe04ccc233e890bfb277e8296c2d .i586.rpm f41d088cf20bfe583e57f95a6b46d625 586.rpm 39e2c09ece3f22b50eb777b85a7218ef .i586.rpm 83398954810403b9dfb65bcf1af25352 86.rpm 18dde4a8af68dd1f78a0177c3214457a source rpm(s): 1-226.src.rpm d5b037aaf122b1b05917e3f0b475baae .src.rpm e10aea97785eb12716ad7d5e20cbd723 src.rpm 54b8bbd368998abc1a63224caa880473 c.rpm f944b14978ecd211c26f8169238292bf src.rpm 66a116aeb9757c538a0643e8322095a7 .rpm 5e3694ba088fd39891a5979380679d20 SuSE-8.2: 20.SuSE-113.i586.rpm a5843cb4e2b16515d70574d83113ac48 3.i586.rpm 724529485d3a304f0479f9216fc361af .i586.rpm b0e687c208053d546b7057257beb7d32 i586.rpm 749b101e7fc4aa5c62e2a5b650002803 586.rpm 3377544a5f6d9c73fdfe05140fce0813 source rpm(s): 0.SuSE-113.src.rpm 0a41c750b8cd3953d47e27ea15c58697 .src.rpm a5e5790e5f7fe62905d29750543c9e20 src.rpm 9defa7cb706e924f8336dd03fafbcfd5 rc.rpm 8469dbc8810dd292100d085e00bb6081 c.rpm d990fcbace1f21ff383abdf7608a17ef SuSE-8.1: 21-226.i586.rpm 43ee5eae102f0258a414dd15e3fd9433 6.i586.rpm 0c6289e168307d615bfe6cef9ebcf879 .i586.rpm 003a38c53fe91070eeae85983930c70e i586.rpm 657d08fa4b5a2ba7de2a314a7d1622e1 586.rpm e19239b4ca52ebd21f775b5e6195f144 source rpm(s): 1-226.src.rpm ee67f5db0ea2f1431f46b7dd27815a56 .src.rpm b29021156d6582e315666b16231b2a60 src.rpm ce5e47d527cee6968cd95bb8430d3e18 rc.rpm a081a0f1e31f5491cdeba1fea5ea6411 c.rpm 1dbfd3b5f272fc75342ae55bbe7ab45c SuSE-8.0: E-299.i386.rpm 7de319a4e6c667fba359686b814d4a73 386.rpm df5aad7c423625a19af151bbba0f2ca8 86.rpm cb02c8381962eda997ebb115ef68ae4c 6.rpm 903c6e61927803c2d592ac50fe9da6ce 86.rpm e2abf9ccdc8191e7d2ace58e8a1b5b5a source rpm(s): SE-299.nosrc.rpm 622c85342dd84abd0400103902d05eed rpm 37916ea39febc4dd43fabfccce9322db pm 0dde0e6758e42de5479e8776475ae76f m 523bef4e31fa67f078d5fcbdc426a4c0 pm 06a2a062a54764a30adae0b8ea40cb29 Opteron x86_64 Platform: SuSE-9.1: 2.6.5-7.75.x86_64.rpm 1c878b1e29a9bea40547637b6a307b2d -2.6.5-7.75.x86_64.rpm 16de3ee2390bb2b92f9fe50451d4f082 .5-7.75.x86_64.rpm c310268daa83f18fcfd4cf19434f06e0 source rpm(s): .5-7.75.src.rpm 2fed0a8f3936027261add7d1cbfa5341 6.5-7.75.nosrc.rpm 9ad26d15566337c83273121390ea4e32 7.75.nosrc.rpm 352951be42b3093efb0148320a6f4c27 SuSE-9.0: 2.4.21-226.x86_64.rpm ced9c66ffa28bf7e7c795781f92083fe -226.x86_64.rpm 60539bc47e8cac0664ac5ca824d311e0 26.x86_64.rpm 083aeedd2a88ccc2e00c8f66cd61b81c source rpm(s): .21-226.src.rpm 58c40a206f6f615daa3486fc6d6ade38 6.src.rpm 1c234f6c0475680b41c644c575ff8ef6 src.rpm e9b90824615859405b1979793662bc0d ___________________________________________________________________________ ___ 2) Pending vulnerabilities in SUSE Distributions and Workarounds: - icecast The icecast service is vulnerable to a remote denial-of-service attack. Update packages will be available soon. - sitecopy The sitecopy package includes a vulnerable version of the neon library (CAN-2004-0179, CAN-2004-0398). Update packages will be available soon. - cadaver The cadaver package includes a vulnerable version of the neon library (CAN-2004-0179, CAN-2004-0398). Update packages will be available soon. - OpenOffice_org The OpenOffice_org package includes a vulnerable version of the neon library (CAN-2004-0179, CAN-2004-0398). Update packages will be available soon. - tripwire A format string bug in tripwire can be exploited locally to gain root permissions. Update packages will be available soon. - postgresql A buffer overflow in psqlODBC could be exploited to crash the application using it. E.g. a PHP script that uses ODBC to access a PostgreSQL database can be utilized to crash the surrounding Apache web-server. Other parts of PostgreSQL are not affected. Update packages will be available soon. - lha Minor security fix for a buffer overflow while handling command line options. This buffer overflow could be exploited in conjunction with other mechanisms to gain higher privileges or access the system remotely. - XDM/XFree86 This update resolves random listening to ports by XDM that allows to connect via the XDMCP. SUSE LINUX 9.1 is affected only. New packages are currently being tested and will be available soon. - mod_proxy A buffer overflow can be triggered by malicious remote servers that return a negative Content-Length value. This vulnerability can be used to execute commands remotely New packages are currently being tested and will be available soon. ___________________________________________________________________________ ___ 3) standard appendix: authenticity verification, additional information - Package authenticity verification: SUSE update packages are available on many mirror ftp servers around the world. While this service is considered valuable and important to the free and open source software community, many users wish to be certain as to be the origin of the package and its content before installing the package. There are two independent verification methods that can be used 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 after you have 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, the checksums offer proof of the authenticity of the package. We recommend against subscribing 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 authenticit y of an rpm package. Use the command rpm -v --checksig to verify the signature of the package, where is the filename of the rpm package that you have downloaded. Of course, package authenticity verification can only target an un-installed rp m package file. Prerequisites: a) gpg is installed b) The package is signed using a certain key. The public part of th is 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 "" 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 ( g) and at . - SUSE runs two security mailing lists to which any interested party may subscribe: - general/linux/SUSE security discussion. All SUSE security announcements are sent to this list. To subscribe, send an email to . - SUSE's announce-only mailing list. Only SUSE's security announcements are sent to this list. To subscribe, send an email to . For general information or the frequently asked questions (faq) send mail to: or respectively. ======================= ========================= ===================== SUSE's security contact is or . The 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 must show 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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