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Gentoo Linux Security Advisory GLSA 200404-09
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http://security.gentoo.org
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Severity: Normal
Title: Cross-realm trust vulnerability in Heimdal

Date: April 09, 2004
Bugs: #46590
ID: 200404-09

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Synopsis
========

Heimdal contains cross-realm vulnerability allowing someone with
control over a realm to impersonate anyone in the cross-realm trust
path.

Background
==========

Heimdal is a free implementation of Kerberos 5.

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

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
app-crypt/heimdal <= 0.6.0 >= 0.6.1

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

Heimdal does not properly perform certain consistency checks for
cross-realm requests, which allows remote attackers with control of a
realm to impersonate others in the cross-realm trust path.

Impact
======

Remote attackers with control of a realm may be able to impersonate
other users in the cross-realm trust path.

Workaround
==========

A workaround is not currently known for this issue. All users are
advised to upgrade to the latest version of the affected package.

Resolution
==========

Heimdal users should upgrade to version 0.6.1 or later:

# emerge sync

# emerge -pv ">=app-crypt/heimdal-0.6.1"
# emerge ">=app-crypt/heimdal-0.6.1"

References
==========

[ 1 ] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0371

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 (dot) org [email concealed] or alternatively, you may file a bug at
http://bugs.gentoo.org.

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

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

http://security.gentoo.org/glsa/glsa-200404-09.xml

Copyright/License
==================
Copyright 2004 Gentoo Technologies, Inc.

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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