SuSE Inc. Information for VU#973654

Linux kernel fails to properly handle floating point signals generated by "fsave" and "frstor"

Status

Affected

Vendor Statement

We will release a new kernel package as soon as possible. Our customers can update their systems by using the YaST Online Update (YOU) tool or installing the RPM file directly from http://www.suse.de/en/private/download/updates/index.html.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Vendor References

None

Addendum

-----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________

                       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 processors
     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 the
   locations below ftp://ftp.suse.com/pub/suse/i386/update/.

     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 <K_FILE.RPM>
   where <K_FILE.RPM> 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
   ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/

 **** 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 apply
   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:
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/kernel-source-2.6.5-7.75.i586.rpm
     8d11469e1815c5b2fa143fce62c17b95

    ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/kernel-default-2.6.5-7.75.i586.rpm
     75222182ad4c766b6482e5b83658819d
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/kernel-smp-2.6.5-7.75.i586.rpm
     45f1244f153ab1387a9dc67e7bcf20bb
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/kernel-bigsmp-2.6.5-7.75.i586.rpm
     517647d955770503fe61ae2549c453dd
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/kernel-source-2.6.5-7.75.src.rpm
     9103503f430b9d854630ecb8855a2fb3
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/kernel-default-2.6.5-7.75.nosrc.rpm
     9381c56f1f64835c5379dde278ac768d
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/kernel-smp-2.6.5-7.75.nosrc.rpm
     4f47dc2be58f5315cf596c051c2892b5
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/kernel-bigsmp-2.6.5-7.75.nosrc.rpm
     732c1e7d2a9e41780464eccdc0d54505

   SuSE-9.0:
   ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/kernel-source-2.4.21-226.i586.rpm
     7b6022e2f80325b42fa7dc3188360530
   ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_athlon-2.4.21-226.i586.rpm
     594efe04ccc233e890bfb277e8296c2d
   ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_deflt-2.4.21-226.i586.rpm
     f41d088cf20bfe583e57f95a6b46d625
   ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_smp-2.4.21-226.i586.rpm
     39e2c09ece3f22b50eb777b85a7218ef
   ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_smp4G-2.4.21-226.i586.rpm
     83398954810403b9dfb65bcf1af25352
   ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_um-2.4.21-226.i586.rpm
     18dde4a8af68dd1f78a0177c3214457a
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/kernel-source-2.4.21-226.src.rpm
     d5b037aaf122b1b05917e3f0b475baae
   ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_athlon-2.4.21-226.src.rpm
     e10aea97785eb12716ad7d5e20cbd723
   ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_deflt-2.4.21-226.src.rpm
     54b8bbd368998abc1a63224caa880473
   ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_smp-2.4.21-226.src.rpm
     f944b14978ecd211c26f8169238292bf
   ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_smp4G-2.4.21-226.src.rpm
     66a116aeb9757c538a0643e8322095a7
   ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_um-2.4.21-226.src.rpm
     5e3694ba088fd39891a5979380679d20

   SuSE-8.2:
   ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/kernel-source-2.4.20.SuSE-113.i586.rpm
     a5843cb4e2b16515d70574d83113ac48
   ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/k_athlon-2.4.20-113.i586.rpm
     724529485d3a304f0479f9216fc361af
   ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/k_deflt-2.4.20-113.i586.rpm
     b0e687c208053d546b7057257beb7d32
   ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/k_psmp-2.4.20-113.i586.rpm
     749b101e7fc4aa5c62e2a5b650002803
   ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/k_smp-2.4.20-113.i586.rpm
     3377544a5f6d9c73fdfe05140fce0813
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/kernel-source-2.4.20.SuSE-113.src.rpm
     0a41c750b8cd3953d47e27ea15c58697
   ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/k_athlon-2.4.20-113.src.rpm
     a5e5790e5f7fe62905d29750543c9e20
   ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/k_deflt-2.4.20-113.src.rpm
     9defa7cb706e924f8336dd03fafbcfd5
   ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/k_psmp-2.4.20-113.src.rpm
     8469dbc8810dd292100d085e00bb6081
   ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/k_smp-2.4.20-113.src.rpm
     d990fcbace1f21ff383abdf7608a17ef

   SuSE-8.1:
   ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/kernel-source-2.4.21-226.i586.rpm
     43ee5eae102f0258a414dd15e3fd9433
   ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/k_athlon-2.4.21-226.i586.rpm
     0c6289e168307d615bfe6cef9ebcf879
   ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/k_deflt-2.4.21-226.i586.rpm
     003a38c53fe91070eeae85983930c70e
   ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/k_psmp-2.4.21-226.i586.rpm
     657d08fa4b5a2ba7de2a314a7d1622e1
   ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/k_smp-2.4.21-226.i586.rpm
     e19239b4ca52ebd21f775b5e6195f144
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/kernel-source-2.4.21-226.src.rpm
     ee67f5db0ea2f1431f46b7dd27815a56
   ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/k_athlon-2.4.21-226.src.rpm
     b29021156d6582e315666b16231b2a60
   ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/k_deflt-2.4.21-226.src.rpm
     ce5e47d527cee6968cd95bb8430d3e18
   ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/k_psmp-2.4.21-226.src.rpm
     a081a0f1e31f5491cdeba1fea5ea6411
   ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/k_smp-2.4.21-226.src.rpm
     1dbfd3b5f272fc75342ae55bbe7ab45c

   SuSE-8.0:
   ftp://ftp.suse.com/pub/suse/i386/update/8.0/d3/kernel-source-2.4.18.SuSE-299.i386.rpm
     7de319a4e6c667fba359686b814d4a73
   ftp://ftp.suse.com/pub/suse/i386/update/8.0/images/k_deflt-2.4.18-299.i386.rpm
     df5aad7c423625a19af151bbba0f2ca8
   ftp://ftp.suse.com/pub/suse/i386/update/8.0/images/k_psmp-2.4.18-299.i386.rpm
     cb02c8381962eda997ebb115ef68ae4c
   ftp://ftp.suse.com/pub/suse/i386/update/8.0/images/k_smp-2.4.18-299.i386.rpm
     903c6e61927803c2d592ac50fe9da6ce
   ftp://ftp.suse.com/pub/suse/i386/update/8.0/images/k_i386-2.4.18-299.i386.rpm
     e2abf9ccdc8191e7d2ace58e8a1b5b5a
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/kernel-source-2.4.18.SuSE-299.nosrc.rpm
     622c85342dd84abd0400103902d05eed
   ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/k_deflt-2.4.18-299.src.rpm
     37916ea39febc4dd43fabfccce9322db
   ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/k_psmp-2.4.18-299.src.rpm
     0dde0e6758e42de5479e8776475ae76f
   ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/k_smp-2.4.18-299.src.rpm
     523bef4e31fa67f078d5fcbdc426a4c0
   ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/k_i386-2.4.18-299.src.rpm
     06a2a062a54764a30adae0b8ea40cb29



   Opteron x86_64 Platform:

   SuSE-9.1:
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/kernel-source-2.6.5-7.75.x86_64.rpm
     1c878b1e29a9bea40547637b6a307b2d
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/kernel-default-2.6.5-7.75.x86_64.rpm
     16de3ee2390bb2b92f9fe50451d4f082
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/kernel-smp-2.6.5-7.75.x86_64.rpm
     c310268daa83f18fcfd4cf19434f06e0
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/kernel-source-2.6.5-7.75.src.rpm
     2fed0a8f3936027261add7d1cbfa5341
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/kernel-default-2.6.5-7.75.nosrc.rpm
     9ad26d15566337c83273121390ea4e32
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/kernel-smp-2.6.5-7.75.nosrc.rpm
     352951be42b3093efb0148320a6f4c27

   SuSE-9.0:
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/kernel-source-2.4.21-226.x86_64.rpm
     ced9c66ffa28bf7e7c795781f92083fe
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/k_deflt-2.4.21-226.x86_64.rpm
     60539bc47e8cac0664ac5ca824d311e0
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/k_smp-2.4.21-226.x86_64.rpm
     083aeedd2a88ccc2e00c8f66cd61b81c
   source rpm(s):
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/kernel-source-2.4.21-226.src.rpm
     58c40a206f6f615daa3486fc6d6ade38
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/k_deflt-2.4.21-226.src.rpm
     1c234f6c0475680b41c644c575ff8ef6
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/k_smp-2.4.21-226.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 <name-of-the-file.rpm>
      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
      security@suse.de), 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 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 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.

Type Bits/KeyID    Date       User ID
pub  2048R/3D25D3D9 1999-03-06 SuSE Security Team <security@suse.de>
pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@suse.de>

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