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From: patrick.doyle at bbc.co.uk (Patrick Doyle)
Subject: Wireless Security

It's an interesting topic, thanks to all your replies.

Have a good weekend

Paddy

-----Original Message-----
From: Jonathan A. Zdziarski [mailto:jonathan@...learelephant.com]
Sent: 28 November 2003 16:46
To: jan.muenther@...ns.com
Cc: Simon Hailstone; Patrick Doyle; full-disclosure@...ts.netsys.com
Subject: Re: [Full-Disclosure] Wireless Security


> You should be aware that MAC addresses can be forged as well.

I believe this also works (at least in Linux)

ifconfig wlan0 hw ether [new mac]

Tools like kismet make it all too easy to find a valid MAC address to
spoof on the network.

Application-Layer encryption is definitely the most secure method. 
EAP+Dynamic WEP keys is a significant enhancement, but still vulnerable
to session hijacking.  You may also consider using Token-based
authentication if you are going to run EAP (and to authenticate your
shells too).  RSA SecurID's ACE/Server will emulate a RADIUS server,
making it very useful for these types of authentication.  I'm sure
Cryptocard has something useful too.

What would be schweet is if you could use the SecurID token code (which
changes every 30 or 60 seconds) as a one-time pad for dynamic WEP key
changes.  Then you wouldn't have to pass WEP keys across the network
where they could be intercepted...and changing every 60 seconds would
make it virtually un-bruteable.

If you haven't read "Wireless Hacks" by O'Reilly yet, I strongly
recommend you grab a copy; it's an excellent little book.

http://www.amazon.com/exec/obidos/tg/detail/-/0596005598/qid=1070037607/sr=1-1/ref=sr_1_1/002-0400399-7348019?v=glance&s=books

Jonathan



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