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Gentoo Linux Security Advisory                           GLSA 200405-23
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                                            http://security.gentoo.org/
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  Severity: High
     Title: Heimdal: Kerberos 4 buffer overflow in kadmin
      Date: May 27, 2004
      Bugs: #50208
        ID: 200405-23

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Synopsis
========

A possible buffer overflow in the Kerberos 4 component of Heimdal has
been discovered.

Background
==========

Heimdal is a free implementation of Kerberos.

Affected packages
=================

    -------------------------------------------------------------------
     Package            /   Vulnerable   /                  Unaffected
    -------------------------------------------------------------------
  1  app-crypt/heimdal        < 0.6.2                         >= 0.6.2

Description
===========

A buffer overflow was discovered in kadmind, a server for
administrative access to the Kerberos database.

Impact
======

By sending a specially formatted message to kadmind, a remote attacker
may be able to crash kadmind causing a denial of service, or execute
arbitrary code with the permissions of the kadmind process.

Workaround
==========

For a temporary workaround, providing you do not require Kerberos 4
support, you may turn off Kerberos 4 kadmin by running kadmind with the
--no-kerberos4 option.

Resolution
==========

All Heimdal users should upgrade to the latest stable version:

    # emerge sync

    # emerge -pv ">=app-crypt/heimdal-0.6.2"
    # emerge ">=app-crypt/heimdal-0.6.2"

References
==========

  [ 1 ] Heimdal 0.6.2 Release Notice
        http://www.pdc.kth.se/heimdal/advisory/2004-05-06/
  [ 2 ] CAN-2004-0434
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0434

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

     http://security.gentoo.org/glsa/glsa-200405-23.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2004 Gentoo Technologies, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/1.0