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SuSE Security Announcement: Kernel brk() vulnerability (SuSE-SA:2003:049)



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

______________________________________________________________________________

                        SUSE Security Announcement

        Package:                Linux Kernel
        Announcement-ID:        SuSE-SA:2003:049
        Date:                   Thursday, December 4th 2003 15:30 MET
        Affected products:      7.3, 8.0, 8.1, 8.2, 9.0
                                SuSE Linux Enterprise Server 7,
                                SuSE Linux Database Server,
                                SuSE eMail Server III, 3.1
                                SuSE Linux Firewall on CD/Admin host
                                SuSE Linux Office Server
                                SuSE Linux Desktop 1.0
                                SuSE Linux School Server
        Vulnerability Type:     local root exploit
        Severity (1-10):        8
        SUSE default package:   yes
        Cross References:       CAN-2003-0961

    Content of this advisory:
        1) security vulnerability resolved:
           - Linux kernel brk() integer overflow
           problem description, discussion, solution and upgrade information
        2) pending vulnerabilities, solutions, workarounds:
             - KDE
             - mc
             - apache1/2
             - freeradius
             - screen
             - mod_gzip
             - unace

        3) standard appendix (further information)

______________________________________________________________________________

1)  problem description, brief discussion, solution, upgrade information

    This security update fixes a serious vulnerability in the Linux
    kernel.  A missing bounds check in the brk() system call allowed
    processes to request memory beyond the maximum size allowed for tasks,
    causing kernel memory to be mapped into the process' address space.
    This allowed local attackers to obtain super user privileges.

    An exploit for this vulnerability is circulating in the wild, and
    has been used to compromise OpenSource development servers.

    There is no temporary workaround for this bug.

    This update also fixes several other security issues in the
    kernel

     -  race condition with files opened via O_DIRECT which could
        be exploited to read disk blocks randomly. This could include
        blocks of previously deleted files with sensitive content.
     -  don't allow users to send signals to kmod
     -  when reading the RTC, don't leak kernel stack data to user space


    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, you decide
    if the paragraph is needed for you or not. Please read through all
    of the steps down to the end. 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 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

    The following options are possible (disregarding 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)

  **** Step 2: Download the package for your system

    Please download the kernel RPM package for your distribution with the
    name starting as indicated by Step 1. The list of all kernel rpm
    packages is appended below. Note: The kernel-source package does not
    contain any binary kernel in bootable form. Instead, it contains the
    sources that the binary kernel rpm packages are made 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 these
    locations below ftp://ftp.suse.com/pub/suse/i386/update/.

      7.3/kernel/2.4.18-20031204
      8.0/kernel/2.4.18-20031204
      8.1/rpm/i586
      8.2/rpm/i586
      9.0/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
             applied.


    If you run SUSE LINUX 8.1 and haven't applied the previous
    kernel update (SUSE-SA:2003:034), AND use 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 being 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 (set in the files /etc/rc.config up to
    7.3) or /etc/sysconfig/kernel (after and including 8.0)) 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 rmadisk (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 have a 7.x system, you must now run the command

      lilo

    as root to initialize the lilo bootloader for your system. Then
    proceed to the next step.

    If you run a SUSE LINUX 8.x or a SLES8 system, there are two options:
    Depending on your software configuration, you have 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 applied to 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 are
    complete, then reboot using the command
        shutdown -r now
    or
        init 6

    Your system should now shut down and reboot with the new kernel.


    Our maintenance customers are being notified individually. The packages
    are being offered to install from the maintenance web.



    Intel i386 Platform:

    SuSE-9.0:
    
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_deflt-2.4.21-144.i586.rpm
      d93394dc68dc342c66554d4b004e8792
    
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_smp-2.4.21-144.i586.rpm
      d23f59681e504eece1ccd4cb582d0d56
    
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/k_athlon-2.4.21-144.i586.rpm
      78b33420df4405715502f9bbb97f1308
    
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/kernel-source-2.4.21-144.i586.rpm
      f4b477a1c368ae6dc9a9a6c579313b5e
    patch rpm(s):
    
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/kernel-source-2.4.21-144.i586.patch.rpm
      38e64b2524825ac4011f53e06366221f
    source rpm(s):
    
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_deflt-2.4.21-144.src.rpm
      cfd352b5058ed763d264d7ce0b276738
    ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_smp-2.4.21-144.src.rpm
      85d7dfacb641c806c6a3e37dc8c819c7
    
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/k_athlon-2.4.21-144.src.rpm
      a2ed9a096c4767d665660514e7e18cd9
    
ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/kernel-source-2.4.21-144.src.rpm
      a9b3d40dc79cb2f1179661790a2a58ce

    SuSE-8.2:
    
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/k_deflt-2.4.20-101.i586.rpm
      9a6363c54735fd3def6398300b091ad1
    
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/k_smp-2.4.20-101.i586.rpm
      31d4639f77dc256310d7f9fd28412d04
    
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/k_athlon-2.4.20-101.i586.rpm
      c0c7dd94b53400f609009344a6be76a8
    
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/k_psmp-2.4.20-101.i586.rpm
      163057fdee5c93159ba468903974e5b1
    
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/kernel-source-2.4.20.SuSE-101.i586.rpm
      f02867306164a2069a8e4e6cd7619626
    patch rpm(s):
    
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/kernel-source-2.4.20.SuSE-101.i586.patch.rpm
      1483d734943e51650f135315cb2e0259
    source rpm(s):
    
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/k_deflt-2.4.20-101.src.rpm
      2bf8dcedc50ddcb9ebdd78427766da16
    ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/k_smp-2.4.20-101.src.rpm
      6299ac0c8487037b19d272234994039e
    
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/k_athlon-2.4.20-101.src.rpm
      c8bb2a49b6dcdc7377ef42ce5b6dc744
    
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/k_psmp-2.4.20-101.src.rpm
      89b682414ea7cd774dfa5a5f26c87cf8
    
ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/kernel-source-2.4.20.SuSE-101.src.rpm
      9555f0b00bb9f178fc92ee8242743b42

    SuSE-8.1:
    
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/k_deflt-2.4.21-151.i586.rpm
      bd095d26abf204779048356c12d207c8
    
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/k_smp-2.4.21-151.i586.rpm
      89346bae8dc2739ec4f03709deddb5ca
    
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/k_athlon-2.4.21-151.i586.rpm
      3a2054a5638f336b3642a2a2a20158b9
    
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/k_psmp-2.4.21-151.i586.rpm
      a7704a31f56bb3bdeba8a41f86d37e83
    
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/kernel-source-2.4.21-151.i586.rpm
      e671a94c8bd50deecaaaddbadbe60c13
    patch rpm(s):
    
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/kernel-source-2.4.21-151.i586.patch.rpm
      76bef0adbc84af087505db768d62fc76
    source rpm(s):
    
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/k_deflt-2.4.21-151.src.rpm
      b22f8a756935574f77f86ce3004ccb28
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/k_smp-2.4.21-151.src.rpm
      f20eb07a9450769c0f5821e76fa5b3f7
    
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/k_athlon-2.4.21-151.src.rpm
      473e48c3e65b7720663102fc3673c36c
    
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/k_psmp-2.4.21-151.src.rpm
      c6fc11acdfe2de62a3000f289f2ac7d4
    
ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/kernel-source-2.4.21-151.src.rpm
      cf82b7da893aeebc0ab5b399d2ac3788

    SuSE-8.0:
    
ftp://ftp.suse.com/pub/suse/i386/update/8.0/images/k_deflt-2.4.18-281.i386.rpm
      074142fcbba96e5f809853251b1db575
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/images/k_smp-2.4.18-281.i386.rpm
      f7729ec9c4f07e237a4cbfa152fb7361
    
ftp://ftp.suse.com/pub/suse/i386/update/8.0/images/k_psmp-2.4.18-281.i386.rpm
      1bd2a3b98237d9e28fbac962ad6d8963
    
ftp://ftp.suse.com/pub/suse/i386/update/8.0/images/k_i386-2.4.18-281.i386.rpm
      f475516c5baf441e14da95032cfff8e8
    
ftp://ftp.suse.com/pub/suse/i386/update/8.0/d3/kernel-source-2.4.18.SuSE-281.i386.rpm
      d562aade6a5e71121a1e45a561040f8d
    patch rpm(s):
    
ftp://ftp.suse.com/pub/suse/i386/update/8.0/d3/kernel-source-2.4.18.SuSE-281.i386.patch.rpm
      5322ae840e45d57236f966f644205c15
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/k_deflt-2.4.18-281.src.rpm
      441cc1ea08b7a60fd9a97750a332383f
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/k_smp-2.4.18-281.src.rpm
      7eae63f8270182f208498a7e0709e2c7
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/k_psmp-2.4.18-281.src.rpm
      b6dc4ee7bd7bb682e87cace4efe3562a
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/k_i386-2.4.18-281.src.rpm
      e16d47d6ed67a2f2b480761b287ac83e
    
ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/kernel-source-2.4.18.SuSE-281.nosrc.rpm
      831d45effd5d0bc74089b49ab1c46fc3

    SuSE-7.3:
    
ftp://ftp.suse.com/pub/suse/i386/update/7.3/kernel/2.4.18-20031204/k_deflt-2.4.18-281.i386.rpm
      074142fcbba96e5f809853251b1db575
    
ftp://ftp.suse.com/pub/suse/i386/update/7.3/kernel/2.4.18-20031204/k_smp-2.4.18-281.i386.rpm
      f7729ec9c4f07e237a4cbfa152fb7361
    
ftp://ftp.suse.com/pub/suse/i386/update/7.3/kernel/2.4.18-20031204/k_psmp-2.4.18-281.i386.rpm
      1bd2a3b98237d9e28fbac962ad6d8963
    
ftp://ftp.suse.com/pub/suse/i386/update/7.3/kernel/2.4.18-20031204/k_i386-2.4.18-281.i386.rpm
      f475516c5baf441e14da95032cfff8e8
    
ftp://ftp.suse.com/pub/suse/i386/update/7.3/kernel/2.4.18-20031204/kernel-source-2.4.18.SuSE-281.i386.rpm
      d562aade6a5e71121a1e45a561040f8d




    Opteron x86_64 Platform:

    SuSE-9.0:
    
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/k_deflt-2.4.21-149.x86_64.rpm
      49833239e39258eb90441d8c724250cd
    
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/k_smp-2.4.21-149.x86_64.rpm
      1fdab1fb0bd48487404ca8860eba5481
    
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/kernel-source-2.4.21-149.x86_64.rpm
      c179dfaa4a6d5f7955a0df918eb82ab8
    patch rpm(s):
    
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/kernel-source-2.4.21-149.x86_64.patch.rpm
      e4b45d0fe82735f94477cfbd9dbb124d
    source rpm(s):
    
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/k_deflt-2.4.21-149.src.rpm
      c0fe06d2767b6f55e2065ddecd4f218a
    
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/k_smp-2.4.21-149.src.rpm
      b86014666e0de02b1903578d6a5bb670
    
ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/kernel-source-2.4.21-149.src.rpm
      8e7668febd1dda675b516212e1704716

______________________________________________________________________________

2)  Pending vulnerabilities in SUSE Distributions and Workarounds:

    - KDE
    New KDE packages are currently being tested. These packages fixes
    several vulnerabilities:
      + remote root compromise (CAN-2003-0690)
      + weak cookies (CAN-2003-0692)
      + SSL man-in-the-middle attack
      + information leak through HTML-referrer (CAN-2003-0459)
      + wrong file permissions of config files
    The packages will be release as soon as testing is finished.

    - mc
    By using a special combination of links in archive-files it is possible
    to execute arbitrary commands while mc tries to open it in its VFS.
    The packages are currently tested and will be release as soon as
    possible.

    - apache1/2
    The widely used HTTP server apache has several security vulnerabilities:
      - locally exploitable buffer overflow in the regular expression code.
        The attacker must be able to modify .htaccess or httpd.conf.
        (affects: mod_alias and mod_rewrite)
      - under some circumstances mod_cgid will output its data to the
        wrong client (affects: apache2)
    Update packages are available on our FTP servers.

    - freeradius
    Two vulnerabilities were found in the FreeRADIUS package.
    The remote denial-of-service attack bug was fixed and new packages
    will be released as soon as testing was successfully finished.
    The other bug is a remote buffer overflow in the module rlm_smb.
    We do not ship this module and will fix it for future releases.

    - screen
    A buffer overflow in screen was reported. Since SuSE Linux 8.0
    we do not ship screen with the s-bit anymore. An update package
    will be released for 7.3 as soon as possible.

    - mod_gzip
    The apache module mod_gzip is vulnerable to remote code execution
    while running in debug-mode. We do not ship this module in debug-mode
    but future versions will include the fix.

    - unace
    The tool unace for handling the archive format ACE is vulnerable to
    a buffer overflow that can be triggered with long file-names as command
    line argument. This only affects unace version 2.5. Unfortunately this
    tool is provided closed source only from the author. Therefore we are
    unable to check for other bugs or look at the patch.
    Update packages are available from our FTP servers.

______________________________________________________________________________

3)  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@xxxxxxx),
       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@xxxxxxx" 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@xxxxxxxx
        -   general/linux/SUSE security discussion.
            All SUSE security announcements are sent to this list.
            To subscribe, send an email to
                <suse-security-subscribe@xxxxxxxx>.

    suse-security-announce@xxxxxxxx
        -   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@xxxxxxxx>.

    For general information or the frequently asked questions (faq)
    send mail to:
        <suse-security-info@xxxxxxxx> or
        <suse-security-faq@xxxxxxxx> respectively.

    =====================================================================
    SUSE's security contact is <security@xxxxxxxx> or <security@xxxxxxx>.
    The <security@xxxxxxx> 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@xxxxxxx>
pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@xxxxxxx>

- -----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see http://www.gnupg.org

mQGiBDnu9IERBACT8Y35+2vv4MGVKiLEMOl9GdST6MCkYS3yEKeueNWc+z/0Kvff
4JctBsgs47tjmiI9sl0eHjm3gTR8rItXMN6sJEUHWzDP+Y0PFPboMvKx0FXl/A0d
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Bye,
     Thomas
- -- 
  Thomas Biege <thomas@xxxxxxx>, SUSE LINUX AG, Security Support & Auditing
   "lynx -source http://www.suse.de/~thomas/contact/thomas.asc | pgp -fka"
     Key fingerprint = 51 AD B9 C7 34 FC F2 54  01 4A 1C D4 66 64 09 83
- -- 
        ... stay with me, safe and ignorant, go back to sleep...
                                - Maynard James Keenan

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