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Category:   Application (Security)  >   kadmind (please use Kerberos) Vendors:   Royal Institute of Technology
(Gentoo Issues Fix) Heimdal k5admind Framing Length Buffer Overflow Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1010315
SecurityTracker URL:  http://securitytracker.com/id/1010315
CVE Reference:   CVE-2004-0434   (Links to External Site)
Date:  May 27 2004
Impact:   Denial of service via network, Execution of arbitrary code via network, Root access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 0.6.1 and prior versions
Description:   A heap overflow vulnerability was reported in Heimdal k5admind. A remote user can execute arbitrary code on the target system.

Evgeny Demidov reported that there is a pre-authentication flaw in the k5admind(8) Kerberos Key Distribution Center (KDC) interface in the processing of Kerberos 4 compatibility administration requests. A remote user can supply a framing length value of less than two bytes to cause the target service to copy an arbitrary amount of data into a small buffer on the heap.

Only systems that have compiled k5admind with Kerberos 4 support are reported to be affected.

Impact:   A remote user can execute arbitrary code on the target system with the privileges of the k5admind daemon.
Solution:   Gentoo has released a fix and indicates that 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"

Vendor URL:  www.pdc.kth.se/heimdal/ (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Gentoo)

Message History:   This archive entry is a follow-up to the message listed below.
May 6 2004 Heimdal k5admind Framing Length Buffer Overflow Lets Remote Users Execute Arbitrary Code



 Source Message Contents

Subject:  [gentoo-announce] [ GLSA 200405-23 ] Heimdal: Kerberos 4 buffer overflow in kadmin



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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

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