[Full-disclosure] [ GLSA 200604-03 ] FreeRADIUS: Authentication bypass in EAP-MSCHAPv2 module

[Matthias Geerdsen]

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Gentoo Linux Security Advisory                           GLSA 200604-03
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                                             http://security.gentoo.org/
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   Severity: Normal
      Title: FreeRADIUS: Authentication bypass in EAP-MSCHAPv2 module
       Date: April 04, 2006
       Bugs: #127229
         ID: 200604-03

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Synopsis
========

The EAP-MSCHAPv2 module of FreeRADIUS is affected by a validation issue
which causes some authentication checks to be bypassed.

Background
==========

FreeRADIUS is an open source RADIUS authentication server
implementation.

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

     -------------------------------------------------------------------
      Package                /  Vulnerable  /                Unaffected
     -------------------------------------------------------------------
   1  net-dialup/freeradius       < 1.1.1                      >= 1.1.1
                                                                < 1.0.0

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

FreeRADIUS suffers from insufficient input validation in the
EAP-MSCHAPv2 state machine.

Impact
======

An attacker could cause the server to bypass authentication checks by
manipulating the EAP-MSCHAPv2 client state machine.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All FreeRADIUS users should upgrade to the latest version:

     # emerge --sync
     # emerge --ask --oneshot --verbose ">=net-dialup/freeradius-1.1.1"

References
==========

   [ 1 ] CVE-2006-1354
         http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-1354
   [ 2 ] FreeRADIUS Vulnerability Notifications
         http://www.freeradius.org/security.html

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

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

   http://security.gentoo.org/glsa/glsa-200604-03.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 2006 Gentoo Foundation, 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/2.0
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