SUSE Security Announcement: krb5 security problems (SUSE-SA:2007:004)

10 Jan 2007

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______________________________________________________________________________

                        SUSE Security Announcement

        Package:                krb5
        Announcement ID:        SUSE-SA:2007:004
        Date:                   Wed, 10 Jan 2007 12:00:00 +0000
        Affected Products:      openSUSE 10.2
                                SUSE LINUX 10.1
                                SUSE LINUX 10.0
                                SUSE LINUX 9.3
                                SUSE SLED 10
                                SUSE SLES 10
        Vulnerability Type:     remote denial of service
        Severity (1-10):        6
        SUSE Default Package:   yes
        Cross-References:       CVE-2006-6143, CVE-2006-6144

    Content of This Advisory:
        1) Security Vulnerability Resolved:
             krb5 security 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

   Various bugs in the Kerberos5 libraries and tools were fixed which
   could be used by remote attackers to crash and potentially execute
   code in kadmind.

   - CVE-2006-6144 / MITKRB5-SA-2006-002: the RPC library could call an
     uninitialized function pointer, which created a security
     vulnerability for kadmind.

   - CVE-2006-6143 / MITKRB5-SA-2006-003: the GSS-API mechglue layer
     could fail to initialize some output pointers, causing callers to
     attempt to free uninitialized pointers.  This caused a security
     vulnerability in kadmind.

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:

   openSUSE 10.2:
   ftp://ftp.suse.com/pub/suse/update/10.2/rpm/i586/krb5-1.5.1-23.2.i586.rpm
          4ca25054bbab5904788c59770244f7db
   ftp://ftp.suse.com/pub/suse/update/10.2/rpm/i586/krb5-server-1.5.1-23.2.i586.rpm
          1255b216e9ccd859dd48d408ff3c47fe

   SUSE LINUX 10.1:
   ftp://ftp.suse.com/pub/suse/update/10.1/rpm/i586/krb5-1.4.3-19.7.i586.rpm
          bb069e7b8a87d1b37d295845d42f01b7
   ftp://ftp.suse.com/pub/suse/update/10.1/rpm/i586/krb5-server-1.4.3-19.7.i586.rpm
          216fbc03ebf686e4fb0e97ea9af37663

   SUSE LINUX 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/i586/krb5-1.4.1-5.3.i586.rpm
          b64ae4d898a21a45215f910d79e25846
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/i586/krb5-server-1.4.1-5.3.i586.rpm
          41cfd49f686df98c58e952ac35f884f4

   SUSE LINUX 9.3:
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/krb5-1.4-16.7.i586.rpm
          8217967cf7b1cbe2f110b62d6587f1ed
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/i586/krb5-server-1.4-16.7.i586.rpm
          e53acbadff99aef651c0bffe9b635cc4

   Power PC Platform:

   openSUSE 10.2:
   ftp://ftp.suse.com/pub/suse/update/10.2/rpm/ppc/krb5-1.5.1-23.2.ppc.rpm
          926d4584a5b99b3e2c4b6e2d7c82f207
   ftp://ftp.suse.com/pub/suse/update/10.2/rpm/ppc/krb5-server-1.5.1-23.2.ppc.rpm
          147cbf384e74834f8bd3ae85b6558801

   SUSE LINUX 10.1:
   ftp://ftp.suse.com/pub/suse/update/10.1/rpm/ppc/krb5-1.4.3-19.7.ppc.rpm
          0f64972c3effc2e8b8d6c60e6cc83ee2
   ftp://ftp.suse.com/pub/suse/update/10.1/rpm/ppc/krb5-server-1.4.3-19.7.ppc.rpm
          b05b1f047f45cb3dae619803c35b2064

   SUSE LINUX 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/ppc/krb5-1.4.1-5.3.ppc.rpm
          8b848a4cdb5eeca47145665009ee6999
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/ppc/krb5-server-1.4.1-5.3.ppc.rpm
          788cea6376b8d0d4fbb7ae6841b1121e

   x86-64 Platform:

   openSUSE 10.2:
   ftp://ftp.suse.com/pub/suse/update/10.2/rpm/x86_64/krb5-1.5.1-23.2.x86_64.rpm
          5048fe45c961d2a101c359beee6dfd90
   ftp://ftp.suse.com/pub/suse/update/10.2/rpm/x86_64/krb5-32bit-1.5.1-23.2.x86_64.rpm
          aab68447731fe22bbf3e7133411658eb
   ftp://ftp.suse.com/pub/suse/update/10.2/rpm/x86_64/krb5-server-1.5.1-23.2.x86_64.rpm
          76d07392dbfa6ce64afb748724ffc383

   SUSE LINUX 10.1:
   ftp://ftp.suse.com/pub/suse/update/10.1/rpm/x86_64/krb5-1.4.3-19.7.x86_64.rpm
          4f28bc902dd81ba3154c8ab502dd6be6
   ftp://ftp.suse.com/pub/suse/update/10.1/rpm/x86_64/krb5-32bit-1.4.3-19.7.x86_64.rpm
          e8cb3fd1f9040c3c162e84f76e490578
   ftp://ftp.suse.com/pub/suse/update/10.1/rpm/x86_64/krb5-server-1.4.3-19.7.x86_64.rpm
          b9f3d11d3ee957b0f228c5276a84005b

   SUSE LINUX 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/krb5-1.4.1-5.3.x86_64.rpm
          dedeffa46109d7339ec71122122589db
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/krb5-32bit-1.4.1-5.3.x86_64.rpm
          4bce2876d9c1b883207e03dc34513eb2
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/krb5-server-1.4.1-5.3.x86_64.rpm
          1ef250e5e23a298349f28b2423e3a8f2

   SUSE LINUX 9.3:
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/krb5-1.4-16.7.x86_64.rpm
          82e4c415098edcaca10ab626cb304bed
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/krb5-32bit-9.3-7.2.x86_64.rpm
          e2cdaaf22c5ecf51274c6d87731cbd7f
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/x86_64/krb5-server-1.4-16.7.x86_64.rpm
          861fb648231993f96b6c9bb789c6fba2

   Sources:

   openSUSE 10.2:
   ftp://ftp.suse.com/pub/suse/update/10.2/rpm/src/krb5-1.5.1-23.2.src.rpm
          49e80a10bedad6caf6584c91262bacb4

   SUSE LINUX 10.1:
   ftp://ftp.suse.com/pub/suse/update/10.1/rpm/src/krb5-1.4.3-19.7.src.rpm
          8a116157fed412cb74c84157391a25e1

   SUSE LINUX 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/src/krb5-1.4.1-5.3.src.rpm
          de6594481cd93860c81a66befa90179e

   SUSE LINUX 9.3:
   ftp://ftp.suse.com/pub/suse/i386/update/9.3/rpm/src/krb5-1.4-16.7.src.rpm
          8e24ef8f705e1c00fe5f2158198e0ed1

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

   SUSE SLES 10
     http://support.novell.com/techcenter/psdb/719d380dfd2862678d739af24aefaf29.h...

   SUSE SLED 10
     http://support.novell.com/techcenter/psdb/719d380dfd2862678d739af24aefaf29.h...

______________________________________________________________________________

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:

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

    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>.

    =====================================================================
    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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