[Full-Disclosure] SuSE Security Announcement: Kernel brk() vulnerability (SuSE-SA:2003:049)

From: Olaf Kirch (okir_at_suse.de)
Date: 12/04/03

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    ______________________________________________________________________________

                            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@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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    - -----END PGP PUBLIC KEY BLOCK-----

    Bye,
         Thomas
    - --
      Thomas Biege <thomas@suse.de>, 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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    _______________________________________________
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    Charter: http://lists.netsys.com/full-disclosure-charter.html


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