Date: Wed, 01 Mar 2006 10:22:52 +0100
From: Marcus Meissner <meissner@suse.de>
To: suse-security-announce@suse.com
Subject: SUSE Security Announcement: gpg,liby2util signature checking problems (SUSE-SA:2006:013)


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Hash: SHA1

______________________________________________________________________________

                        SUSE Security Announcement

        Package:                gpg,liby2util
        Announcement ID:        SUSE-SA:2006:013
        Date:                   Wed, 01 Mar 2006 11:00:00 +0000
        Affected Products:      SUSE Linux 10.0
                                SUSE Linux 9.3
                                SUSE Linux 9.2
                                SUSE Linux 9.1
                                SUSE Linux Desktop 1.0
                                SUSE Linux Enterprise Server 8
                                SUSE Linux Enterprise Server 9
                                UnitedLinux 1.0
				Open Enterprise Server 1
				Novell Linux Desktop 9
        Vulnerability Type:     remote code execution
        Severity (1-10):        9
        SUSE Default Package:   yes
        Cross-References:       CVE-2006-0455, CVE-2006-0803

    Content of This Advisory:
        1) Security Vulnerability Resolved:
             gpg signature checking problems
           Problem Description
        2) Solution or Work-Around
        3) Special Instructions and Notes
        4) Package Location and Checksums
        5) Pending Vulnerabilities, Solutions, and Work-Arounds:
            See SUSE Security Summary Report.
        6) Authenticity Verification and Additional Information

______________________________________________________________________________

1) Problem Description and Brief Discussion

   This is a reissue of SUSE-SA:2006:009, after we found out that also
   gpg version < 1.4.x are affected by the signature checking problem
   of CVE-2006-0455.

   With certain handcraft-able signatures GPG was returning a 0 (valid
   signature) when used on command-line with option --verify.

   This could make automated checkers, like for instance the patch file
   verification checker of the YaST Online Update, pass malicious patch
   files as correct and allow remote code execution.

   This is tracked by the Mitre CVE ID CVE-2006-0455.

   Also, the YaST Online Update script signature verification had used a
   feature which was not meant to be used for signature verification,
   making it possible to supply any kind of script which would be
   considered correct. This would also allow code execution.

   This issue is tracked by the Mitre CVE ID CVE-2006-0803.

   Both attacks require an attacker either manipulating a YaST Online
   Update mirror or manipulating the network traffic between the mirror
   and your machine.

2) Solution or Work-Around

   There is no known workaround, please install the update packages.

3) Special Instructions and Notes

   None.

4) Package Location and Checksums

   The preferred method for installing security updates is to use the YaST
   Online Update (YOU) tool. YOU detects which updates are required and
   automatically performs the necessary steps to verify and install them.
   Alternatively, download the update packages for your distribution manually
   and verify their integrity by the methods listed in Section 6 of this
   announcement. Then install the packages using the command

     rpm -Fhv <file.rpm>

   to apply the update, replacing <file.rpm> with the filename of the
   downloaded RPM package.


   x86 Platform:

   SUSE Linux 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/i586/liby2util-2.12.9-0.4.i586.rpm
          91697f9207b20931d669f9f6d085b816
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/i586/liby2util-devel-2.12.9-0.4.i586.rpm
          c6815c8ff1cc695f91cf9c1ba6960554

   SUSE Linux 9.3:
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/liby2util-2.11.7-0.3.i586.rpm
          a321ab146d07c50cc69a91352ac28bf7
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/liby2util-devel-2.11.7-0.3.i586.rpm
          1215bcf8f061079dbe05b93b1d611818

   SUSE Linux 9.2:
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/gpg-1.2.5-3.4.i586.rpm
          3df19ea2069732c17da1b150d76fdba1
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/liby2util-2.10.7-0.3.i586.rpm
          ab21dd4a8f561abba2cd5b25e3076e41
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/liby2util-devel-2.10.7-0.3.i586.rpm
          e1b45fbf2b326e7a4d06d1fa23100415

   SUSE Linux 9.1:
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/gpg-1.2.4-68.10.i586.rpm
          5ea37344f72e28ff06f40976081e6499
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/liby2util-2.9.27-0.7.i586.rpm
          dcdaf21f345b2d4ffa55a78c74625633
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/liby2util-devel-2.9.27-0.7.i586.rpm
          18624f647f80b9e39a8c910c90d60c87

   Power PC Platform:

   SUSE Linux 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/ppc/liby2util-2.12.9-0.4.ppc.rpm
          584b0cc0fadc160148b98976cbb9abb8
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/ppc/liby2util-devel-2.12.9-0.4.ppc.rpm
          dcc926d75e15cda7c83e6ab110defd1f

   x86-64 Platform:

   SUSE Linux 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/liby2util-2.12.9-0.4.x86_64.rpm
          712892d9238ad5ae230837f89528a4c1
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/liby2util-devel-2.12.9-0.4.x86_64.rpm
          ea0e06b186f3ffe7df066888b69e64fe

   SUSE Linux 9.3:
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/liby2util-2.11.7-0.3.x86_64.rpm
          7cd1425a429b4637b34aa675d4eeaa85
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/liby2util-devel-2.11.7-0.3.x86_64.rpm
          8d27157261b70a5bb51ab643d8dd1fe8

   SUSE Linux 9.2:
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/gpg-1.2.5-3.4.x86_64.rpm
          9e0fb9977027d7b95006ac6405a1befc
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/liby2util-2.10.7-0.3.x86_64.rpm
          b33ebf6703546c56ec10eea205e4fbd8
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/liby2util-devel-2.10.7-0.3.x86_64.rpm
          6b385cd9d0902eeede67267933248404

   SUSE Linux 9.1:
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/gpg-1.2.4-68.10.x86_64.rpm
          d05a99f75d4089a56b2f21c2b7aca67a
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/liby2util-2.9.27-0.7.x86_64.rpm
          d1c2276f502d6ad34940d1f2b907890d
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/liby2util-devel-2.9.27-0.7.x86_64.rpm
          d74648e8c92952b1c9fdb4796f3d360e

   Sources:

   SUSE Linux 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/src/liby2util-2.12.9-0.4.src.rpm
          e1f57563afd30bb0252494a010d3c0c0

   SUSE Linux 9.3:
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/src/liby2util-2.11.7-0.3.src.rpm
          2663aecb5e77147aca6881bd92e570bb

   SUSE Linux 9.2:
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/gpg-1.2.5-3.4.src.rpm
          9415d5fefce7c12bd381d03255ec02f1
   ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/liby2util-2.10.7-0.3.src.rpm
          9e6d935a4c540a5de5ff2681ee8281f1

   SUSE Linux 9.1:
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/gpg-1.2.4-68.10.src.rpm
          4147426d68077823fa808905e10478bf
   ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/liby2util-2.9.27-0.7.src.rpm
          f4d1da1c13fd712999a87f7736eec2eb
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/gpg-1.2.4-68.10.src.rpm
          c3ee5b82f7bb056082b3402d59b1eaed
   ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/liby2util-2.9.27-0.7.src.rpm
          3dc3eea2b078aa1222875ad8abd09260

   Our maintenance customers are notified individually. The packages are
   offered for installation from the maintenance web:

   http://support.novell.com/cgi-bin/search/searchtid.cgi?psdb/3b6c0c5ac07d0c820d800216e3ed2240.html
   http://support.novell.com/cgi-bin/search/searchtid.cgi?psdb/76efde0032721703f2b0b1d8a15c440c.html
______________________________________________________________________________

5) Pending Vulnerabilities, Solutions, and Work-Arounds:

   See SUSE Security Summary Report.
______________________________________________________________________________

6) 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 where you saved 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 the integrity of
    a package needs to be verified to ensure that it has not been tampered
    with.

    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) Using the internal gpg signatures of the rpm package
    2) MD5 checksums as provided in this announcement

    1) 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 at
       the end of this announcement.

    2) If you need an alternative means of verification, use the md5sum
       command to verify the authenticity of the packages. Execute the command

         md5sum <filename.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
       SUSE security announcement. Because the announcement containing the
       checksums is cryptographically signed (by security@suse.de), the
       checksums show proof of the authenticity of the package if the
       signature of the announcement is valid. Note that the md5 sums
       published in the SUSE Security Announcements are valid for the
       respective packages only. Newer versions of these packages cannot be
       verified.

  - 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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