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[ 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@xxxxxxxxxx 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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