Fwknop in BackTrack 5 Repository
Just a quick update to say that fwknop (Single Packet Authorization tool) has made it into the BackTrack 5 repository. Although it’s not installed by default, it’s a few keystrokes away, and can be installed by typing the following into the terminal:
apt-get install fwknop-client
apt-get install fwknop-server (if you want to use the server on your BackTrack install)
Note that it’s still version 1.9.12 of the Perl implementation, as the the C++ port (v 2.0) is still in the Release Candidate stage. Those of you who have been meaning to experiment with Single Packet Authorization and have already downloaded BT5, now’s a good time to install fwknop and give it a try! When installing fwknop-server it brings up an ultra-simple config screen that allows you to set up your initial passphrase.
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Firesheep Detection and Defence with FireShepherd [and BlackSheep]
When Firesheep intercepts a valid session cookie for the sites it supports, it automatically makes its own request to that site using that session. Just as the Firesheep user can intercept network traffic over wifi, so can the normal users, so this behaviour means that Firesheep itself is detectable.
By transmitting a request to Facebook, Twitter or Google with a fake session ID, and monitoring the network using Wireshark, it is possible to look for follow-up connections from another host, using your fake session ID. By performing this ‘reverse attack’ on loop, it’s possible to flood the attacker’s Firesheep window with tons of invalid sessions. Note that this doesn’t protect you entirely, and any valid login to these sites will still be intercepted by Firesheep. But it’s possible to detect whether a Firesheep user is on the network.
Someone has released FireShepherd (currently Windows only), a tool that automates the flooding of invalid sessions, supposedly temporarily killing Firesheep running on the local network. Note that FireShepherd doesn’t detect the presence of Firesheep on the network.
[Updated] BlackSheep, a Firefox plugin, has been released which alerts the user if Firesheep is in use on the network. It does this using the method described above.
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