SUSE Security Announcement: kernel local privilege escalation (SUSE-SA:2004:046)

From: Marcus Meissner (meissner_at_suse.de)
Date: 12/22/04

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    Date: Wed, 22 Dec 2004 16:01:26 +0100
    To: bugtraq@securityfocus.com
    
    

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

    ______________________________________________________________________________

                            SUSE Security Announcement

            Package: kernel
            Announcement-ID: SUSE-SA:2004:046
            Date: Wednesday, Dec 22nd 2004 16:00 MEST
            Affected products: 9.0 / AMD64
                                    SUSE Linux Enterprise Server 8 / AMD64
            Vulnerability Type: local privilege escalation
            Severity (1-10): 8
            SUSE default package: yes
            Cross References: CAN-2004-1144

        Content of this advisory:
            1) security vulnerability resolved:
                 - local root exploit in 2.4 AMD64 kernel
               problem description
            2) solution/workaround
            3) special instructions and notes
            4) package location and checksums
            5) pending vulnerabilities, solutions, workarounds:
                - see SUSE Security Summary
            6) standard appendix (further information)

    ______________________________________________________________________________

    1) problem description, brief discussion

        Due to missing argument checking in the 32 bit compatibility
        system call handler in the 2.4 Linux Kernel on the AMD64 platform
        a local attacker can gain root access using a simple program.

        This issue was found and fixed by Petr Vandrovec and has been
        assigned the Mitre CVE ID CAN-2004-1144.

        This is a 2.4 Kernel and AMD64 specific problem, other
        architectures and the 2.6 Kernel are not affected.

    2) solution/workaround

        There is no workaround, please install the supplied kernels.

    3) special instructions and notes

        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.

      **** 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 chip sets
          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/x86_64/update/9.0/rpm/x86_64.

        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.

    4) package location and checksums

        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.

        x86-64 Platform:

        SUSE Linux 9.0:
        ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/k_deflt-2.4.21-268.x86_64.rpm
          585c7dd47f8e6f9e60ae4eed5fbb21fe
        ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/k_smp-2.4.21-268.x86_64.rpm
          44b0c5e8beae0d1b60b85f0f1406a4f9
        ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/kernel-source-2.4.21-268.x86_64.rpm
          000194dc37b15a93c8b0313288c9c879
        source rpm(s):
        ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/k_deflt-2.4.21-268.src.rpm
          3f0a9d938251f2d72fce0ccc979c19a1
        ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/k_smp-2.4.21-268.src.rpm
          33b072ab6ef6333f42bda07a5de7e658
        ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/kernel-source-2.4.21-268.src.rpm
          772c469c0907594d6396918a5d4c91f6
    ______________________________________________________________________________

    5) Pending vulnerabilities in SUSE Distributions and Workarounds:

        See the SUSE Security Summary Report for more information.

    ______________________________________________________________________________

    6) 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 disrecommend to subscribe 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 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.

    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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