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Gentoo Linux Security Advisory                           GLSA 200711-09
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: MadWifi: Denial of Service
      Date: November 07, 2007
      Bugs: #195705
        ID: 200711-09

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Synopsis
========

MadWifi does not correctly process beacon frames which can lead to a
remotely triggered Denial of Service.

Background
==========

The MadWifi driver provides support for Atheros based IEEE 802.11
Wireless Lan cards.

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

    -------------------------------------------------------------------
     Package                  /  Vulnerable  /              Unaffected
    -------------------------------------------------------------------
  1  net-wireless/madwifi-ng      < 0.9.3.3                 >= 0.9.3.3

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

Clemens Kolbitsch and Sylvester Keil reported an error when processing
beacon frames with an overly large "length" value in the
 "xrates"
element.

Impact
======

A remote attacker could act as an access point and send a specially
crafted packet to an Atheros based wireless client, possibly resulting
in a Denial of Service (kernel panic).

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All MadWifi users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose
 ">=net-wireless/madwifi-ng-0.9.3.3"

References
==========

  [ 1 ] CVE-2007-5448
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5448

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

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

  http://security.gentoo.org/glsa/glsa-200711-09.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 2007 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/2.5
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