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Wireless Wi-Fi WEP Encryption Hacking

PostPosted: Wed Jun 28, 2017 7:46 pm
by Jason
I've setup a test router here running WEP encryption as I just got the new Alfa Networks wireless adaptor.

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I've always had an interest in wireless security. It is pretty interesting to me. These days the dated WEP encryption is pretty weak and can be cracked fairly easily. Here i will show how it can be achieved.

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For this test i am using my Raspberry Pi Zero W running Kali Linux. It is a perfect little device for wireless hacking once teamed up with the Alfa Networks wireless device.

Once booted into Kali I SSH'd into the machine as i run it headless and checked to see if the device was being picked up, which it was.

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Once i did this i used Airmon-ng to put the device into wireless monitor mode. This is a special mode in which it can view wireless traffic and also inject packets. Only special wireless devices can do this (such as the Alfa Networks device I am using.)

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For this test I have setup an access point running WEP as "TALKTALK" and then a random bunch of number. It is the 2nd from the top in the list below.

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Once i noted down the MAC address I went ahead and used the following command to associate myself with the access point and also create a text file for Aircrack-ng to use to store all the data we capture.

airodump-ng --bssid C4:07:2F:13:A3:E8 -c 7 -w WEPcrack wlan1mon


This gives the following output:

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We are now associated with the access point and ready to inject our evilness... But first, we need a client to connect so we can spoof their MAC address so the access point will receive data from us.

I added a device and spoofed the MAC on my machine and ran the following command to commence the packet injection attack from what would appear to be the client MAC address.

aireplay-ng -3 -b C4:07:2F:13:A3:E8 -h 98:4B:E1:CA:4A:12 wlan1mon


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The attack is now running! It's just a short waiting game now as we spoof packets and capture data. Once complete I ran the following command.

aircrack-ng WEPcrack-01.cap


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this runs Aircrack-ng and tells it to view the text file we made. If we have enough IVs, aircrack-ng will display the key on our screen, usually in hexadecimal format. Simply take that hex key and apply it when logging into the remote AP and you are in!

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We have a winner!