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C H APT ER 9 SEC URIN G A WI RELES S NET WO RK
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Cracking WEP Keys
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To drive home why it is so important to practice good security with your wireless environment, let s look at cracking a few types of wireless security protocols. There are three steps we will need to go through in order to crack a WEP key. First, we need to locate the AirPort using a tool such as KisMAC. Second, we need to generate a minimum of 400,000 WEP initialization vectors (random bits of data used to decrypt wireless traffic). We will capture the traffic using Aireplay to generate the required initialization vectors. Aireplay is available at http://www.wirelessdefence.org/ Contents/Aircrack_aireplay.htm. Once captured, Airodump will be used to save the captured initialization vectors into a file. Run the Airodump command, as shown in the following example: ./airodump <wireless interface> <outputfilename> <MACfiler>
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Note Aireplay and Airodump are free to download and use.
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Make sure your output filename ends with the file extension .cap. The MAC filter would be used when you have more than one access point or AirPort on the same channel within range of the system you are launching the attack from, in which case you would use the MAC address of the access point you are targeting. With Airodump still running, open another Terminal session, and run Aireplay with the following command: ./aireplay b <maca ddress of wireless access point> -x 512 <wifiport>
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Note The b in the previous line of code is the bssid (MAC address of the access point), and the x is the
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nbpps (number of packets per second).
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This will catch an initialization vector packet and replay it against the AirPort to get enough raw data to allow you to crack the WEP password. You can tell when you have enough initialization vectors by watching the IV column in Airodump. The more traffic running through the AirPort, the faster packets will be caught (if the AirPort is not being used, the AirPort might take a long time to crack). Once you have reached 400,000, use the Ctrl+C shortcut to exit Aireplay and Airodump. This will save the file you specified in Airodump and stop Aireplay from resending the IV packet out to the AP. Once you have our initialization vectors in a file, you can analyze the packets to recover the actual WEP key using Aircrack to analyze the file and recover the WEP key. Aircrack is a set of tools used for auditing wireless networks by allowing you to crack WEP and WPA keys: ./aircrack n 128 <outputfilenamefromairodump>
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CHAPTER 9 SE CURING A WIRE LESS NETWORK
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Note n is the nbits or WEP key length (listed in KisMAC).
If the attack that you have just launched was executed correctly, then you will get the key in red text followed by KEY FOUND.
Cracking WPA-PSK
Of the wireless encryption protocols, WPA is one of the hardest to hack. Let s explore a way to do it. For this we will use two open source security tools, Airforge and Aircrack. Once a target network using a WPA access point has been identified, using a tool such as KisMAC, you can begin to launch the attack using Airforge to create a deauthentication packet. ./airforge <MACaddressofap> <MACofclient> filename.cap What Airforge will do is cause a user who is connected to the WAP to become deauthenticated from the network. Once disconnected, the deauthenticated user s system will attempt to reauthenticate, and the SSID will be sent over the air in plain text. You will typically want to set the packet length to 26, -u 0, -v (to specify sub), -w0, -x1 (number of packets), -r (to redirect to file), and eth0 (adapter to inject to). While you re running this, you ll want to open Ethereal (or another packet capturing application) and start catching packets. After you are done packet catching (after about 5,000 to 10,000 packets), you want to sort by EAP over LAN (EAPOL). After filtering by EAPOL, analyze the remainder of the packets for the password. Once you find the four-way packets, save the packets. Then you will be able to use a tool called cowpatty or Brutal Gift to run a dictionary attack on the saved packets, and after some time you will be able to crack the WPA password. Most WPA passwords are simple for users to remember. It is often words such as abcd or 1234 or something with the name of the location. You can first try a combination of these. However, keep in mind that the Apple AirPort requires a minimum of eight characters for WPA on the Apple AirPort.
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