SUSE Security Summary Report (SUSE-SR:2005:009)

29 Mar 2005

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______________________________________________________________________________

                        SUSE Security Summary Report

        Announcement-ID:        SUSE-SR:2005:009
        Date:                   Tue, 29 Mar 2005 15:00:00 +0000
        Cross References:       CAN-2005-0469
                                CAN-2005-0468

    Content of this advisory:
        1) solved security vulnerabilities:
            - telnet

        2) pending vulnerabilities, solutions, workarounds:
            - kernel bluetooth security problem
            - wget directory traversal problem
            - IDN domain name cloaking problems
            - PostgreSQL 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.

   Only one problem was released without advisory this week, but please
   read the additional notes on the kernel problem in the pending
   section.

   - telnet

     Several vulnerabilities were fixed in the telnet client.

     A buffer overflow in the LINEMODE sub option command SLC can be
     exploited by a malicious server to execute arbitrary code on
     the client site with the privileges of the user running telnet.

     This is tracked by the Mitre CVE ID CAN-2005-0469.

     Another buffer overflow can be exploited remotely via a malicious
     server by sending environment variables to the client. The result
     of this bug is arbitrary code execution too.

     This is tracked by the Mitre CVE ID CAN-2005-0468.

     Note that this bug can also be exploited by clicking on a URL
     link that uses telnet:// as protocol and points to a server
     controlled by an attacker.

     All SUSE Linux based distributions are affected by this problem.
______________________________________________________________________________

2) Pending vulnerabilities in SUSE Distributions and Workarounds:

   - New kernel bluetooth security problems

     A security problem was found in the kernels bluetooth stack,
     allowing a local attacker to gain root access.

     This works even if bluetooth is not enabled, since the problematic
     modules are loaded on demand.

     Until we have finished our updates please use one of the following
     workarounds:

     - Remove or move away the bluetooth core module.

       On 2.6 kernels this is the file:
           /lib/modules/<kernel version>/kernel/net/bluetooth/bluetooth.ko

       On 2.4 kernels this is the file:
           /lib/modules/<kernel version>/kernel/net/bluetooth/bluez.o

     - Disable auto load of the bluetooth protocol module by commenting
       out the line:
                alias net-pf-31           bluez

       in /etc/modules.conf (2.4 systems) or the line:
                alias net-pf-31           bluetooth

       in /etc/modprobe.conf (2.6 systems).

     Make sure the module is not loaded, or run "rmmod bluetooth" /
     "rmmod bluez".

   - multiple wget problems

     We are still working on updated packages for the wget issues as
     reported on Bugtraq:
            http://www.securityfocus.com/archive/1/383998

   - IDN (Internationalized Domain Name) cloaking / homograph attacks

     Problems with the IDN / punycode handling that allows non-ASCII
     domain names were reported for every browser.

     - The KDE approach is currently filtering on the top level domain.
     - The Mozilla approach is currently to display punycode.

     We have released Mozilla Firefox updates for this problem, the others
     are still pending.

   - PostgreSQL problems

     Additional PostgreSQL problems were reported:
     - A local user could bypass the EXECUTE permission check for
       functions by using the CREATE AGGREGATE command. CAN-2005-0244

     - Other earlier listed problems are already fixed.

     We are working on updates for this problem.
______________________________________________________________________________

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 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@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>.
@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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Marcus Meissner

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