If you are auditing WPA-PSK networks, you can use this tool to identify weak passphrases that were used to generate the PMK. Supply a libpcap capture file that includes the 4-way handshake, a dictionary file of passphrases to guess with, and the SSID for the network.
What is coWPAtty?
coWPAtty is the implementation of an offline dictionary attack against WPA/WPA2 networks using PSK-based authentication (e.g. WPA-Personal). Many enterprise networks deploy PSK-based authentication mechanisms for WPA/WPA2 since it is much easier than establishing the necessary RADIUS, supplicant and certificate authority architecture needed for WPA-Enterprise authentication. coWPAtty can implement an accelerated attack if a precomputed PMK file is available for the SSID that is being assessed.
./cowpatty –r eap–test.dump –f dict –s somethingclever
cowpatty 4.6 – WPA–PSK dictionary attack. <email@example.com>
Usage: cowpatty [options]
–f Dictionary file
–d Hash file (genpmk)
–r Packet capture file
–s Network SSID (enclose in quotes if SSID includes spaces)
–c Check for valid 4–way frames, does not crack
–h Print this help information and exit
–v Print verbose information (more –v for more verbosity)
–V Print program version and exit
This tool can also accept dictionary words from STDIN, allowing us to utilize a tool such as John the Ripper to create lots of word permutations from a dictionary file.
john –wordfile:dictfile –rules –session:johnrestore.dat –stdout:63 |
cowpatty –r eap–test.dump –f – –s somethingclever
In the default configuration of John the Ripper, common permutations of dictionary words will be sent as potential passwords to coWPAtty.
This tool is based around the whitepaper by Robert Moskowitz:
There are also the following to check out:
You can download coWPAtty here:
Or read more here.