Dictionary attack against Cisco's LEAP, Wireless LANs vulnerable Oct 03 2003 10:38AM
Michael Renzmann (security dylanic de)

Cisco released a security notice [1] in August about possible dictionary
attacks against their proprietary LEAP (Lightweight Extensible
Authentication Protocol, used with 802.1x). But according to
Computerworld [2] it seems that this information has not been spread
well enough.

In addition, Unstrung yesterday reported [3] about the demonstration of
a tool that seems to be able to retrieve valid passwords for LEAP
protected WLANs within "minutes, even seconds". The tool is not
available yet, but its author (Joshua Wright from Johnson & Wales
University) announced "that the tool will be generally available in a
couple of months".

Those of you who are using LEAP to protect their Wireless LAN should
take care of a proper password policy and change passwords regularly.
Cisco provides further information on password selection in their
advisory ("Available Documentation", last paragraph).

Bye, Mike

[3] http://www.unstrung.com/document.asp?doc_id=41185

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