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TITLE:
MadWifi "xrates" Element Denial of Service

SECUNIA ADVISORY ID:
SA27197

VERIFY ADVISORY:
http://secunia.com/advisories/27197/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
MadWifi 0.x
http://secunia.com/product/12842/

DESCRIPTION:
Clemens Kolbitsch and Sylvester Keil have reported a vulnerability in
MadWifi, which can be exploited by malicious people to cause a DoS
(Denial of Service).

The vulnerability is caused due to an error in the processing of
beacon frames. This can be exploited via a specially crafted beacon
frame with an overly large "length" value (greater than 15) in the
extended supported rates element ("xrates").

Successful exploitation causes the driver to exit and results in a
kernel panic.

The vulnerability is reported in version 0.9.3.2. Other versions may
also be affected.

SOLUTION:
Fixed in the SVN repository.
http://madwifi.org/changeset/2736

PROVIDED AND/OR DISCOVERED BY:
Clemens Kolbitsch and Sylvester Keil, Secure Systems Lab / SEC
Consult

ORIGINAL ADVISORY:
http://www.sec-consult.com/fileadmin/Advisories/20071012-0-madwifi-xrates.txt

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