Articles / SuSE: New heimdal packages …

SuSE: New heimdal packages fix remote code execution

A remote buffer overflow has been fixed in the heimdal / kerberos telnetd daemon which could lead to a remote user executing code as root by overflowing a buffer. Fixed packages are available from ftp.suse.com.
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______________________________________________________________________________

                       SUSE Security Announcement

       Package:                heimdal
       Announcement ID:        SUSE-SA:2005:040
       Date:                   Wed, 06 Jul 2005 14:00:00 +0000
       Affected Products:      8.2, 9.0, 9.1, 9.2
                               SUSE Linux Desktop 1.0
                               SUSE Linux Enterprise Server 8, 9
                               Novell Linux Desktop 9
       Vulnerability Type:     remote code execution
       Severity (1-10):        9
       SUSE Default Package:   yes
       Cross-References:       CAN-2005-2040

   Content of This Advisory:
       1) Security Vulnerability Resolved:
            heimdal telnetd remote buffer overflow
          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

  A remote buffer overflow has been fixed in the heimdal / kerberos
  telnetd daemon which could lead to a remote user executing code as
  root by overflowing a buffer.

  This attack requires the use of the kerberized telnetd of the heimdal
  suite, which is not used by default on SUSE systems.

  This is tracked by the Mitre CVE ID CAN-2005-2040.

2) Solution or Work-Around

  Please install the updated packages.

3) Special Instructions and Notes

  Since the heimdal telnetd is usually started from inetd/xinetd,
  no action is necessary.


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.

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


  x86 Platform:

  SUSE Linux 9.2:
  ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/heimdal-0.6.2-8.4.i586.rpm
         3c58f2d19431fec5e398dac27df1f4d4

  SUSE Linux 9.1:
  ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/heimdal-0.6.1rc3-55.18.i586.rpm
         d96212ff5cfae6790f33fd5fd2fbaf0e
  source rpm(s):
  ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/heimdal-0.6.1rc3-55.18.src.rpm
         e5b9e2eede280ee45908e7760119c00a

  SUSE Linux 9.0:
  ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/heimdal-0.6-165.i586.rpm
         810f6b76593cb4188a6f05da62edb983
  source rpm(s):
  ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/heimdal-0.6-165.src.rpm
         05f4ce0b1bf5a8a277d72206723f5e66

  SUSE Linux 8.2:
  ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/heimdal-0.4e-413.i586.rpm
         8d49e11b757755d4b59c0a2ec922ebb4
  source rpm(s):
  ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/heimdal-0.4e-413.src.rpm
         35ed1cbb68084f390d58009382c88712

  x86-64 Platform:

  SUSE Linux 9.2:
  ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/heimdal-0.6.2-8.4.x86_64.rpm
         26fd8fbf592fc8b3f92afff2c2443a1f
  source rpm(s):
  ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/heimdal-0.6.2-8.4.src.rpm
         34aed06065553bd7b2c20c24c7bbe66b

  SUSE Linux 9.1:
  ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/heimdal-0.6.1rc3-55.18.x86_64.rpm
         628db7ea5c88db6ee84b7d90794e92a3
  source rpm(s):
  ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/heimdal-0.6.1rc3-55.18.src.rpm
         8c0bd4f6ccee1a87725262d37894b2a2

  SUSE Linux 9.0:
  ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/x86_64/heimdal-0.6-165.x86_64.rpm
         0fc2978b91c3eee2397fc6c3ae811849
  source rpm(s):
  ftp://ftp.suse.com/pub/suse/x86_64/update/9.0/rpm/src/heimdal-0.6-165.src.rpm
         ad57d43e4b8d02705fd1e1861bfa56ab


______________________________________________________________________________

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:

   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-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
               .

   For general information or the frequently asked questions (FAQ),
   send mail to  or
   .

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