SUSE Security Summary Report (SUSE-SR:2006:026)

17 Nov 2006

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______________________________________________________________________________

                        SUSE Security Summary Report

        Announcement ID:        SUSE-SR:2006:026
        Date:                   Fri, 17 Nov 2006 15:00:00 +0000
        Cross-References:       CVE-2006-5794 CVE-2006-5864 CVE-2006-4339
                                CVE-2006-5467 CVE-2006-2362 CVE-2006-4809
                                CVE-2006-4808 CVE-2006-4807 CVE-2006-4806
                                CVE-2006-5461 CVE-2006-0743

    Content of this advisory:
        1) Solved Security Vulnerabilities:
            - openssh return value checking
            - gv stack overflow
            - bind DNSSEC RSA signature checking problem
            - ruby CGI denial of service problem
            - binutils tekhex overflow
            - imlib2-loaders denial of service and overflows
            - avahi netlink message injection
            - log4net syslog format string problem
        2) Pending Vulnerabilities, Solutions, and Work-Arounds:
            - None listed this week.
        3) Authenticity Verification and Additional Information

______________________________________________________________________________

1) Solved Security Vulnerabilities

   To avoid flooding mailing lists with SUSE Security Announcements for minor
   issues, SUSE Security releases weekly summary reports for the low profile
   vulnerability fixes. The SUSE Security Summary Reports do not list md5 sums
   or download URLs like the SUSE Security Announcements that are released for
   more severe vulnerabilities.

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

   - openssh return value checking

     The OpenSSH release 4.5 contains a security fix which has been
     back ported to the openssh versions in our old products.

     CVE-2006-5794: Incorrect return argument checking in the privilege
     separation monitor was fixed. In case of an exploitable unprivileged
     helper this could have been used to elevate privileges.

     This is by default not exploitable, it requires another exploitable
     problem in the privilege separated processes.

     All SUSE Linux based products were affected by this problem.

   - gv stack overflow

     A stack overflow in the postscript viewer gv could be used to
     exploited to execute code, if the user could be tricked into
     viewing a prepared postscript file using gv. (CVE-2006-5864)

     All SUSE Linux based products were affected.

   - bind DNSSEC RSA signature checking problem

     The RSA signature problem tracked by the Mitre CVE ID CVE-2006-4339
     also affects the DNSSEC implementation in the BIND nameserver.

     All SUSE Linux based distributions were affected by this problem.

   - ruby CGI denial of service problem

     A denial of service problem in the CGI multipart parsing of
     "ruby" was fixed, which could have allowed remote attackers
     to affect a denial of service attack against ruby based
     web services. (CVE-2006-5467)

     All SUSE Linux based products containing ruby were affected.

   - binutils tekhex overflow

     A buffer overflow was fixed in the tekhex handling in "binutils"
     which could be used by attackers supplying files to "file" to crash
     this program. (CVE-2006-2362)

     All SUSE Linux based products were affected, except SLE 10 and 10.1,
     which already included the fix at ship time.

   - imlib2-loaders denial of service and overflows

     Various security problems have been fixed in the imlib2 image
     loaders:

     CVE-2006-4809: A stack buffer overflow in loader_pnm.c could be used
     by attackers to execute code by supplying a handcrafted PNM image.

     CVE-2006-4808: A heap buffer overflow in loader_tga.c could
     potentially be used by attackers to execute code by supplying a
     handcrafted TGA image.

     CVE-2006-4807: A out of bounds memory read in loader_tga.c could
     be used to crash the imlib2 using application with a handcrafted
     TGA image.

     CVE-2006-4806: Various integer overflows in width*height calculations
     could lead to heap overflows which could potentially be used to
     execute code. Affected here are the ARGB, PNG, LBM, JPEG and TIFF
     loaders.

     Additionally loading of TIFF images on 64bit systems is now possible.

     SUSE Linux 9.2 up to 10.1 and SLED 10 were affected by this problem.

     Since the only common user of imlib2 is digikam, which usually does
     not receive images from the network, chance of exploit-ability is low.

   - avahi netlink message injection

     Avahi did not check that the received netlink messages originated
     from the kernel. This could be used by local attackers to inject
     packets into avahi which could be used to inject bad netlink messages
     into Avahi, confusing its routing code. (CVE-2006-5461).

     SUSE Linux 10.1 and SLED 10 were affected by this problem.

   - log4net syslog format string problem

     This update fixes a format string exploit in the RemoteSyslogAppender
     of the C# log4net.dll. It requires an attacker to be able to inject
     prepared text into the logging framework.

     The issue is tracked by Mitre CVE ID CVE-2006-0743 and was found
     by Sebastian Krahmer of SUSE Security.

     Affected was the log4net package in SUSE Linux 10.1 and all C#
     applications that include a copy of log4net.dll. The latter were
     not updated yet.
______________________________________________________________________________

2) Pending Vulnerabilities, Solutions, and Work-Arounds

   None are listed this week.
______________________________________________________________________________

3) Authenticity Verification and Additional Information

  - Announcement authenticity verification:

    SUSE security announcements are published via mailing lists and on Web
    sites. The authenticity and integrity of a SUSE security announcement is
    guaranteed by a cryptographic signature in each announcement. All SUSE
    security announcements are published with a valid signature.

    To verify the signature of the announcement, save it as text into a file
    and run the command

      gpg --verify <file>

    replacing <file> with the name of the file containing the announcement.
    The output for a valid signature looks like:

      gpg: Signature made <DATE> using RSA key ID 3D25D3D9
      gpg: Good signature from "SuSE Security Team <security@suse.de>"

    where <DATE> is replaced by the date the document was signed.

    If the security team's key is not contained in your key ring, you can
    import it from the first installation CD. To import the key, use the
    command

      gpg --import gpg-pubkey-3d25d3d9-36e12d04.asc

  - Package authenticity verification:

    SUSE update packages are available on many mirror FTP servers all over the
    world. While this service is considered valuable and important to the free
    and open source software community, the authenticity and integrity of a
    package needs to be verified to ensure that it has not been tampered with.

    The internal 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, replacing <file.rpm> with the
    filename of the RPM package downloaded. The package is unmodified if it
    contains a valid signature from build@suse.de with the key ID 9C800ACA.

    This key is automatically imported into the RPM database (on RPMv4-based
    distributions) and the gpg key ring of 'root' during installation. You can
    also find it on the first installation CD and included at the end of this
    announcement.

  - SUSE runs two security mailing lists to which any interested party may
    subscribe:

    suse-security@suse.com
        -   General Linux and SUSE security discussion.
            All SUSE security announcements are sent to this list.
            To subscribe, send an e-mail 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 e-mail 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>.

    =====================================================================
    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, the
    clear text signature should show proof of the authenticity of the text.

    SUSE Linux Products GmbH provides 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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