SUSE Security Announcement: kernel local privilege escalation (SUSE-SA:2005:003)

From: Marcus Meissner (meissner_at_suse.de)
Date: 01/21/05

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Date: Fri, 21 Jan 2005 16:11:27 +0100
To: bugtraq@securityfocus.com

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

______________________________________________________________________________

SUSE Security Announcement

        Package: kernel
        Announcement-ID: SUSE-SA:2005:003
        Date: Friday, Jan 21st 2005 16:00 MET
        Affected products: 8.1, 8.2, 9.0, 9.1, 9.2
                                SUSE Linux Enterprise Server 8, 9
                                SUSE Linux Desktop 1.0
                                Novell Linux Desktop 9
        Vulnerability Type: local privilege escalation
        Severity (1-10): 7
        SUSE default package: yes
        Cross References: CAN-2004-1235
                                CAN-2005-0001

    Content of this advisory:
        1) security vulnerability resolved:
             - local privilege escalation
             - local denial of service attacks
           problem description
        2) solution/workaround
        3) special instructions and notes
        4) package location and checksums
        5) pending vulnerabilities, solutions, workarounds:
            - see summary report
        6) standard appendix (further information)

______________________________________________________________________________

1) problem description, brief discussion

Several exploitable security problems were identified and fixed in
the Linux kernel, the core of every SUSE Linux product.

    - Due to missing locking in the sys_uselib system call a local attacker
      can gain root access. This was found by Paul Starzetz and is tracked
      by the Mitre CVE ID CAN-2004-1235.

    - Paul Starzetz also found a race condition in SMP page table handling
      which could lead to a local attacker gaining root access on SMP
      machines. This is tracked by the Mitre CVE ID CAN-2005-0001.

    - A local denial of service was found in the auditing subsystem which
      have lead a local attacker crashing the machine. This was reported
      and fixed by Redhat.

    - The sendmsg / cmsg fix from the previous kernel update was faulty
      on 64bit systems with 32bit compatibility layer and could lead to
      32bit applications not working correctly on those 64bit systems.

- The smbfs security fixes from a before-previous kernel update were
faulty for some file write cases.

- A local denial of service with Direct I/O access to NFS file systems
could lead a local attacker to crash a machine with NFS mounts.

    - grsecurity reported a signed integer problem in the SCSI ioctl
      handling which had a missing boundary check.
      Due to C language specifics, this evaluation was not correct and
      there actually is no problem in this code.
      The signed / unsigned mismatch was fixed nevertheless.

- Several more small non security problems were fixed.

   NOTE: Two days ago we released the Service Pack 1 for the SUSE Linux
   Enterprise Server 9. This kernel update contains fixes for the SUSE
   Linux Enterprise Server 9 GA version kernel line.

A fix for the Service Pack 1 version line will be available shortly.

2) solution/workaround

There is no workaround. Please install the provided update packages.

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/i386/update/.

      8.1/rpm/i586
      8.2/rpm/i586
      9.0/rpm/i586
      9.1/rpm/i586
      9.2/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.

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 Platform:

x86-64 Platform:

    SUSE Linux 9.2:
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/x86_64/kernel-source-2.6.8-24.11.x86_64.rpm
      d8d5dfd431c9b989195f94d3d3c1ea64
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/x86_64/kernel-smp-2.6.8-24.11.x86_64.rpm
      3a16e2109a1dbf177500430213e45b69
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/x86_64/kernel-default-2.6.8-24.11.x86_64.rpm
      51213878a7116455b9443688d0b39aa0
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/src/kernel-source-2.6.8-24.11.src.rpm
      bbfdc289c2d1f1a73ac6fa759ecfaf87
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/src/kernel-smp-2.6.8-24.11.nosrc.rpm
      9539d6093144fbbd066681f61c9aa07d
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.2/rpm/src/kernel-default-2.6.8-24.11.nosrc.rpm
      eeeebf4ea4942f6093b56f7a3d7a7de3

    SUSE Linux 9.1:
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/kernel-source-2.6.5-7.111.30.x86_64.rpm
      44996d9e1da1df537cb1b2100553d2af
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/kernel-smp-2.6.5-7.111.30.x86_64.rpm
      11ad693478569dd691d237679328bd1b
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/kernel-default-2.6.5-7.111.30.x86_64.rpm
      deaeb48a6815587535b1adddf68131ef
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/kernel-source-2.6.5-7.111.30.src.rpm
      fdef7eaed76e07a85ebbba9323b64f8d
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/kernel-smp-2.6.5-7.111.30.nosrc.rpm
      3605a6f50f0d799c73849cb382d786ac
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/kernel-default-2.6.5-7.111.30.nosrc.rpm
      d0410d0e5c32cd44bae3da7b42cac23a

    SUSE Linux 9.0:
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/kernel-source-2.4.21-273.x86_64.rpm
      ed6c099957a83fc87abd74e3549e9799
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/k_deflt-2.4.21-273.x86_64.rpm
      18226b51d911e09cd83657c99dd4506f
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/k_smp-2.4.21-273.x86_64.rpm
      0489274cc30666eeec2be0127a669530
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/kernel-source-2.4.21-273.src.rpm
      792149722a14f021aa095ec4fcc33976
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/k_deflt-2.4.21-273.src.rpm
      9279c9a0613473a71057e76ab4b5a0e5
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/k_smp-2.4.21-273.src.rpm
      3bbd006852b9b8aab8a2868d922451d5

______________________________________________________________________________

5) pending vulnerabilities in SUSE Distributions and Workarounds:

Please refer to our SUSE Security Summary report.

______________________________________________________________________________

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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