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                                   CERT-Renater

                        Note d'Information No. 2007/VULN428
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DATE                      : 08/11/2007

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : Systems running MadWifi.

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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 at 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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