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TUCoPS :: Linux :: SUSE :: hack0384.htm

SUSE Security Announcement: kernel (SuSE-SA:2004:017)



SUSE Security Announcement: kernel (SuSE-SA:2004:017)


-----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 
    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
    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-2.4.21-2 26.i586.rpm
      f41d088cf20bfe583e57f95a6b46d625
    ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_smp-2.4.21-2 26.i586.rpm
      39e2c09ece3f22b50eb777b85a7218ef
    ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_smp4G-2.4.2 1-226.i586.rpm
      83398954810403b9dfb65bcf1af25352
    ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_um-2.4.21-22 6.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-2.4.21-2 26.src.rpm
      e10aea97785eb12716ad7d5e20cbd723
    ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_deflt-2.4.21-22 6.src.rpm
      54b8bbd368998abc1a63224caa880473
    ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_smp-2.4.21-22 6.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-2.4.20-1 13.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-2.4.20-1 13.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-2.4.20-1 13.src.rpm
      a5e5790e5f7fe62905d29750543c9e20
    ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/k_deflt-2.4.20-11 3.src.rpm
      9defa7cb706e924f8336dd03fafbcfd5
    ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/k_psmp-2.4.20-1 13.src.rpm
      8469dbc8810dd292100d085e00bb6081
    ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/k_smp-2.4.20-11 3.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-2.4.21-2 26.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-2.4.21-2 26.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-2.4.21-2 26.src.rpm
      b29021156d6582e315666b16231b2a60
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/k_deflt-2.4.21-22 6.src.rpm
      ce5e47d527cee6968cd95bb8430d3e18
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/k_psmp-2.4.21-2 26.src.rpm
      a081a0f1e31f5491cdeba1fea5ea6411
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/k_smp-2.4.21-22 6.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-2.4.18-29 9.i386.rpm
      df5aad7c423625a19af151bbba0f2ca8
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/images/k_psmp-2.4.18-2 99.i386.rpm
      cb02c8381962eda997ebb115ef68ae4c
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/images/k_smp-2.4.18-29 9.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.sr c.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-so urce-2.6.5-7.75.x86_64.rpm
      1c878b1e29a9bea40547637b6a307b2d
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/kernel-de fault-2.6.5-7.75.x86_64.rpm
      16de3ee2390bb2b92f9fe50451d4f082
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/kernel-sm p-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-so urce-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 
       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 
       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 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-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
                . 

    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.

Type Bits/KeyID    Date       User ID
pub  2048R/3D25D3D9 1999-03-06 SuSE Security Team  
pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key  

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