[Full-Disclosure] [ GLSA 200405-23 ] Heimdal: Kerberos 4 buffer overflow in kadmin

[Kurt Lieber]

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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 at 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
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