From: Morgan, Andy (Andy.Morgan@agiliti.com)
Date: Fri Jul 18 2003 - 12:51:26 EDT
Ian,
There are some tools that will work to try to find a WEP key but they require a lot of data and time. They exploit known vulnerabilities in the WEP algorithm to find the keys. However it could take as much as 500 meg of data. I don't have the links handy. Sorry.
As far as brute forcing. ok idea but not very doable. to iterate through all cobinations would be 2^128 possibilities which gets you to about 3.4028236692093846346337460743177e+38 possible combinations. If you assumed you could do 1 per second - which would be tough if you wait for DHCP to respond it would take you 10790283070806014188970529154990 years to get through all the combinations. Thats a long time. :) If somebody could check my math that would be great.
Thanks,
afm
-----Original Message-----
From: Ian Chilvers [mailto:Ian.Chilvers@prolateral.com]
Sent: Fri 7/18/2003 7:18 AM
To: pen-test@securityfocus.com
Cc:
Subject: V/Scan for Wireless LANs
Hi all
We've been asked to perform a vulnerability assessment for a company that
has a Wireless LAN. The W/LAN is running WEP with a random key generated,
rather than a dictionary word.
Are there any tools out there that can brute force a WEP.
Take this example. A person parks the car in the car park and sniffs the
air waves with a product like NetStumbler. He discovers the W/LAN but with
WEP.
Is there a tool he can use to discover the WEP key (possible by brute force)
If there isn't such a tool, how does this sound for an idea.
Run a app that starts at binary 0's and counts upto 128bits of 1's
For each sequence listen to see if there are any sensible packets or even
send out a DHCP discover request to see if you get a reply. This would then
possibly give you the WEP key.
Any comments
Ian....
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