Mailinglist Archive: opensuse-security-announce (10 mails)

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SUSE Security Summary Report SUSE-SR:2004:003
  • From: Marcus Meissner <meissner@xxxxxxx>
  • Date: Tue, 7 Dec 2004 14:37:02 +0000 (UTC)
  • Message-id: <41B5B8E8.mailIGJ1108HA@xxxxxxx>

-----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________

                        SUSE Security Summary Report

        Announcement-ID:        SUSE-SR:2004:003
        Date:                   Tuesday, Dec 7th 2004 15:00 MEST
        Cross References:       CAN-2004-0782
                                CAN-2004-0883
                                CAN-2004-0947
                                CAN-2004-1010
                                CAN-2004-1011
                                CAN-2004-1012
                                CAN-2004-1013
                                CAN-2004-1070
                                CAN-2004-1071
                                CAN-2004-1072
                                CAN-2004-1073
                                CAN-2004-1074


    Content of this advisory:
        1) solved security vulnerabilities:
            - kernel problems
            - cyrus-imapd remote problems
            - imlib image loader problems
            - unarj directory traversal and buffer overflow
            - zip buffer overflow problem

        2) pending vulnerabilities, solutions, workarounds:
            - Sun and Blackdown Java
            - new kernel problems

        3) standard appendix (further information)

______________________________________________________________________________

1) solved security vulnerabilities

   To avoid spamming lists with advisories for every small incident,
   we will release weekly summary advisories for issues where we have
   released updates without a full advisory. Since these are minor
   issues, md5sums and ftp URLs are not included.

   Fixed packages for the following incidents are already available on
   our FTP server and via the YaST Online Update.

    - kernel

        Several problems have been found in the Linux 2.4 and 2.6
        kernels:

        - Several issues have been found in the error handling of the ELF
          loader routines by Paul Starzetz of isec.pl. These are tracked
          by the Mitre CVE Ids: CAN-2004-1070,CAN-2004-1071,CAN-2004-1072
          CAN-2004-1073.

        - Several overflow checks in the smbfs handling of both Linux
          2.4 and 2.6 were found missing by Stefan Esser.
          This is tracked by the Mitre CVE Id CAN-2004-0883.

        - Handcrafted a.out binaries could be used to trigger a local
          denial of service condition in both 2.4 and 2.6 Linux kernels.
          Fixes for this problem were done by Chris Wright.
          This is tracked by the Mitre CVE Id CAN-2004-1074.

        - A very small race window was found in the memory management of
          the kernel which could be used to show the content of random
          physical memory pages potentially leading to information
          disclosure. This is already fixed in the mainline kernel.

        These bugs affect all SUSE Linux products. A separate advisory
        has already gone out for this issue.


    - cyrus-imapd

        Remote buffer overflow possibilities in the Cyrus IMAP daemon
        were found by Stefan Esser and Sebastian Krahmer.

        These are tracked by the Mitre CVE IDs CAN-2004-1011,
        CAN-2004-1012, and CAN-2004-1013.

        All SUSE Linux based products are affected. A separate advisory
        has already gone out for this issue.


    - imlib

        A review of the Fedora Core team found more problems in the
        imlib source code. Patches to fix these problems have been
        applied. These are related to the vulnerability tracked in
        the Mitre CVE ID CAN-2004-0782 for which we already released
        updated packages.

        All SUSE Linux based products are affected.

    - unarj

        A directory traversal problem in the unpacker unarj was reported
        which allows an attacker to overwrite files outside of the current
        directory. Additionally Ludwig Nussel of SUSE found some buffer
        overflow problems during extraction allowing an handwritten arj
        archive to potentially execute code. The buffer overflow is tracked
        by the Mitre CVE ID CAN-2004-0947.

        All SUSE Linux based products are affected.


    - zip

        A buffer overflow in the unpacker zip was reported, which potentially
        allows an attacker with a handcrafted ZIP archive to remotely execute
        code. This is tracked by the Mitre CVE ID CAN-2004-1010.

        All SUSE Linux based products are affected.

______________________________________________________________________________

2)  Pending vulnerabilities in SUSE Distributions and Workarounds:

    - Sun Java Plugin

        A privilege escalation problem was found in the Sun Java Plugin
        which could have a remote attacker reading and writing files of
        a local user browsing websites.

        This bug affects all SUSE versions on the Intel x86 and AMD64 /
        Intel Extended Memory Architecture (EM64T) platforms.

        We are in the process of releasing updated Java packages.


    - kernel

        Several more problems have been found in the Linux 2.4 and 2.6
        kernels:

        - A race condition in the unix_dgram_recvmsg() could lead
          to a local attacker overwriting kernel memory. This is tracked
          by the Mitre CVE ID CAN-2004-1068.

        - Local denial of service in aio_free_ring().

        - Local denial of service with badly formed ELF executables
          on 64 bit systems.

        - Some more minor issues.

        All SUSE Linux based products are affected and we are in the
        process of preparing updated packages.

______________________________________________________________________________

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 recommend against subscribing to security lists that cause the
       e-mail 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
       file name of the rpm package that you have downloaded. Of course,
       package authenticity verification can only target an uninstalled 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>

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