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Gentoo Linux Security Advisory                           GLSA 200704-15
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http://security.gentoo.org/ 
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  Severity: Normal
     Title: MadWifi: Multiple vulnerabilities
      Date: April 17, 2007
      Bugs: #173434
        ID: 200704-15

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Synopsis
=======
Multiple vulnerabilities have been discovered in the MadWifi driver,
possibly leading to a Denial of Service and information disclosure.

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                    >= 0.9.3

Description
==========
The driver does not properly process Channel Switch Announcement
Information Elements, allowing for an abnormal channel change. The
ieee80211_input() function does not properly handle AUTH frames and the
driver sends unencrypted packets before WPA authentication succeeds.

Impact
=====
A remote attacker could send specially crafted AUTH frames to the
vulnerable host, resulting in a Denial of Service by crashing the
kernel. A remote attacker could gain access to sensitive information
about network architecture by sniffing unencrypted packets. A remote
attacker could also send a Channel Switch Count less than or equal to
one to trigger a channel change, resulting in a communication loss and
a Denial of Service.

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"

References
=========
  [ 1 ] CVE-2007-7178
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-7178 
  [ 2 ] CVE-2007-7179
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-7179 
  [ 3 ] CVE-2007-7180
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-7180 

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

http://security.gentoo.org/glsa/glsa-200704-15.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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