Articles / SuSE: New krb5 packages fix…

SuSE: New krb5 packages fix remote code execution

The KRB5 libraries and utilities contained two security problems for which updates were released. A stack-based buffer overflow in kadmind was fixed which can be exploited by authenticated remote users to gain root. This requires kadmind to run to be effective. Additionally two bugs in the RPC library of kadmind were fixed that can lead to remote system compromise. Note that third-party applications using this RPC library are vulnerable too. Fixed packages are available from ftp.suse.com.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

______________________________________________________________________________

                        SUSE Security Announcement

        Package:                krb5
        Announcement ID:        SUSE-SA:2007:038
        Date:                   Tue, 03 Jul 2007 17:00:00 +0000
        Affected Products:      SUSE LINUX 10.0
                                SUSE LINUX 10.1
                                openSUSE 10.2
                                SUSE Linux Enterprise Desktop 10 SP1
                                SLE SDK 10 SP1
                                SUSE Linux Enterprise Server 10 SP1
        Vulnerability Type:     remote code execution
        Severity (1-10):        7
        SUSE Default Package:   no
        Cross-References:       CVE-2007-2442, CVE-2007-2443, CVE-2007-2798

    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

   The KRB5 libraries and utilities contained two security problems for which updates
   were released.

   - CVE-2007-2798: A stack-based buffer overflow in kadmind was fixed
     which can be exploited by authenticated remote users to gain
     root. This requires kadmind to run to be effective.

   - CVE-2007-2442, CVE-2007-2443: Additionally two bugs in the RPC library
     of kadmind were fixed that can lead to remote system compromise. Note
     that third-party applications using this RPC library are vulnerable
     too.

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 

   to apply the update, replacing  with the filename of the
   downloaded RPM package.


   x86 Platform:

   openSUSE 10.2:
   ftp://ftp.suse.com/pub/suse/update/10.2/rpm/i586/krb5-1.5.1-23.6.i586.rpm
          dc2fa8951dada9f5682fe449dc385e2d
   ftp://ftp.suse.com/pub/suse/update/10.2/rpm/i586/krb5-devel-1.5.1-23.6.i586.rpm
          dd2d611d86a420e45f5cacce9d7fdec1
   ftp://ftp.suse.com/pub/suse/update/10.2/rpm/i586/krb5-server-1.5.1-23.6.i586.rpm
          5daa3fedc4198ebb7b4d0a8127bed8ed

   SUSE LINUX 10.1:
   ftp://ftp.suse.com/pub/suse/update/10.1/rpm/i586/krb5-1.4.3-19.22.i586.rpm
          09da59a0aaafd6c8d22321752f2c38d3
   ftp://ftp.suse.com/pub/suse/update/10.1/rpm/i586/krb5-devel-1.4.3-19.22.i586.rpm
          0840fcc71f5b4e97beb835e0e25dedbc
   ftp://ftp.suse.com/pub/suse/update/10.1/rpm/i586/krb5-server-1.4.3-19.22.i586.rpm
          9d23419758f2b0a69ba143dbacbc9f0a

   SUSE LINUX 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/i586/krb5-1.4.1-5.7.i586.rpm
          32b71e707e4ec85b0eee500de51a89cf
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/i586/krb5-devel-1.4.1-5.7.i586.rpm
          f71c6582dcb3a74a804a4143ff6f48c3
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/i586/krb5-server-1.4.1-5.7.i586.rpm
          22b2f9c5cc94918a58c8c5e1b4d6296d

   Power PC Platform:

   openSUSE 10.2:
   ftp://ftp.suse.com/pub/suse/update/10.2/rpm/ppc/krb5-1.5.1-23.6.ppc.rpm
          cdf7854a981af8b5b9e4ad5d0eca9c7d
   ftp://ftp.suse.com/pub/suse/update/10.2/rpm/ppc/krb5-devel-1.5.1-23.6.ppc.rpm
          5aba32af56d726c3616cc4260a69a848
   ftp://ftp.suse.com/pub/suse/update/10.2/rpm/ppc/krb5-server-1.5.1-23.6.ppc.rpm
          a1ab8842ba74f4b2a3e2cba56d730556

   SUSE LINUX 10.1:
   ftp://ftp.suse.com/pub/suse/update/10.1/rpm/ppc/krb5-1.4.3-19.22.ppc.rpm
          aa13e756476c571bdb9d1f909ffdd2d9
   ftp://ftp.suse.com/pub/suse/update/10.1/rpm/ppc/krb5-devel-1.4.3-19.22.ppc.rpm
          c121580b3e9392f8de76efda8d5dd551
   ftp://ftp.suse.com/pub/suse/update/10.1/rpm/ppc/krb5-server-1.4.3-19.22.ppc.rpm
          aabf1f7df56922b01d67213af2cfc0af

   SUSE LINUX 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/ppc/krb5-1.4.1-5.7.ppc.rpm
          069361f8698af89dc366bf3d2cdf7239
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/ppc/krb5-devel-1.4.1-5.7.ppc.rpm
          e440e4b49b571b8bf9ebf0f9200d29c3
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/ppc/krb5-server-1.4.1-5.7.ppc.rpm
          4188e3334beceefce3cab6aa8429a16c

   x86-64 Platform:

   openSUSE 10.2:
   ftp://ftp.suse.com/pub/suse/update/10.2/rpm/x86_64/krb5-1.5.1-23.6.x86_64.rpm
          edff62bb110662ee8a16f51b69c684c2
   ftp://ftp.suse.com/pub/suse/update/10.2/rpm/x86_64/krb5-32bit-1.5.1-23.6.x86_64.rpm
          af81d30ce34ee7c0c708a8c0f17d81a5
   ftp://ftp.suse.com/pub/suse/update/10.2/rpm/x86_64/krb5-devel-1.5.1-23.6.x86_64.rpm
          7d204e67fa211a528acedd6980925686
   ftp://ftp.suse.com/pub/suse/update/10.2/rpm/x86_64/krb5-devel-32bit-1.5.1-23.6.x86_64.rpm
          8036b0e78e1fea05e895b7d2c5717538
   ftp://ftp.suse.com/pub/suse/update/10.2/rpm/x86_64/krb5-server-1.5.1-23.6.x86_64.rpm
          14238f108e2375205961a73ec15ecbde

   SUSE LINUX 10.1:
   ftp://ftp.suse.com/pub/suse/update/10.1/rpm/x86_64/krb5-1.4.3-19.22.x86_64.rpm
          0c46b69cf856956753908711a391ca3c
   ftp://ftp.suse.com/pub/suse/update/10.1/rpm/x86_64/krb5-32bit-1.4.3-19.22.x86_64.rpm
          cd9562c71d1439f9ea1b7fd29b2a2a15
   ftp://ftp.suse.com/pub/suse/update/10.1/rpm/x86_64/krb5-devel-1.4.3-19.22.x86_64.rpm
          624a0d8362e07050d705642f12e6109e
   ftp://ftp.suse.com/pub/suse/update/10.1/rpm/x86_64/krb5-devel-32bit-1.4.3-19.22.x86_64.rpm
          30cd873aa47a0006d5e402e2280d311f
   ftp://ftp.suse.com/pub/suse/update/10.1/rpm/x86_64/krb5-server-1.4.3-19.22.x86_64.rpm
          6149c3d8873ebbdf0549f74eabd61a0e

   SUSE LINUX 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/krb5-1.4.1-5.7.x86_64.rpm
          eaf8552be5695919d2d7a058339c4d1f
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/krb5-32bit-1.4.1-5.7.x86_64.rpm
          146f189e550f82bc987cde96a0b13086
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/krb5-devel-1.4.1-5.7.x86_64.rpm
          5bd145009778a85a0e8d26f58cf976c6
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/krb5-devel-32bit-1.4.1-5.7.x86_64.rpm
          21418e68ed403d5bc822e8e31473bc57
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/x86_64/krb5-server-1.4.1-5.7.x86_64.rpm
          2c55efe366234d32d547c85ffe3e78a2

   Sources:

   openSUSE 10.2:
   ftp://ftp.suse.com/pub/suse/update/10.2/rpm/src/krb5-1.5.1-23.6.src.rpm
          e3a6f207ca990afd58afec40b3b08aea

   SUSE LINUX 10.1:
   ftp://ftp.suse.com/pub/suse/update/10.1/rpm/src/krb5-1.4.3-19.22.src.rpm
          a29ba835ba013e45102b136d7c0f89a8

   SUSE LINUX 10.0:
   ftp://ftp.suse.com/pub/suse/i386/update/10.0/rpm/src/krb5-1.4.1-5.7.src.rpm
          b4a34b1b66194f86cd6163aa9a5879b4

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

   SUSE Linux Enterprise Server 10 SP1
     http://support.novell.com/techcenter/psdb/b25610d8b470e16c60af96095d35faae.html

   SLE SDK 10 SP1
     http://support.novell.com/techcenter/psdb/b25610d8b470e16c60af96095d35faae.html

   SUSE Linux Enterprise Desktop 10 SP1
     http://support.novell.com/techcenter/psdb/b25610d8b470e16c60af96095d35faae.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 

    replacing  with the name of the file where you saved the
    announcement. The output for a valid signature looks like:

      gpg: Signature made  using RSA key ID 3D25D3D9
      gpg: Good signature from "SuSE Security Team "

    where  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 

       to verify the signature of the package, replacing  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 

       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-announce@opensuse.org
        -   SUSE's announce-only mailing list.
            Only SUSE's security announcements are sent to this list.
            To subscribe, send an e-mail to
                .

    =====================================================================
    SUSE's security contact is  or .
    The  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 
pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key 

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