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

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Date: Tue, 04 Apr 2006 20:57:33 +0200
From: Matthias Geerdsen <vorlon@...too.org>
To: gentoo-announce@...ts.gentoo.org
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com,
	security-alerts@...uxsecurity.com
Subject: [ GLSA 200604-03 ] FreeRADIUS: Authentication
 bypass in EAP-MSCHAPv2 module

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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@...too.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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