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Hack Wi-Fi Using Wifite in Kali / Backtrack

Written By Akademy on Wednesday, March 15, 2017 | 3:09 AM

In this article series, we will look at a tool named Wifite suitable for automated auditing of wireless networks. Most of you who have experience in wireless pentesting would use tools like airmon-ng, aireplay-ng, airodump-ng, aircrack-ng to crack wireless networks. This would involve a sequence of steps, like capturing a specific numbers of IV’s in case of WEP, capturing the WPA handshake in case of WPA etc, and then subsequently using aircrack-ng to crack the password required for authentication to the network. Wifite aims to ease this process by using a wrapper over all these tools and thus making it super easy to crack Wifi networks.

Here is a list of features of Wifite as per its official homepage.
  • sorts targets by signal strength (in dB); cracks closest access points first
  • automatically de-authenticates clients of hidden networks to reveal SSIDs
  • numerous filters to specify exactly what to attack (wep/wpa/both, above certain signal strengths, channels, etc)
  • customizable settings (timeouts, packets/sec, etc)
  • “anonymous” feature; changes MAC to a random address before attacking, then changes back when attacks are complete
  • all captured WPA handshakes are backed up to wifite.py’s current directory
  • smart WPA de-authentication; cycles between all clients and broadcast deauths
  • stop any attack with Ctrl+C, with options to continue, move onto next target, skip to cracking, or exit
  • displays session summary at exit; shows any cracked keys
  • all passwords saved to cracked.txt
  • built-in updater: ./wifite.py -upgrade
Before we start using wifite, make sure you have a proper wireless card that supports packet injection. If you don’t have one, i would suggest that you buy this card.
Note that there is a bug in Wifite that may or may not be there in your particular version of Wifite. The bug basically doesn’t aireplay-ng to function properly and displays an error like aireplay-ng exited unexpectedly . In order to fix this, you will have to make slight modifications in the code of wifite. You can install gedit (apt-get install gedit) which is a text editor and then edit the wifite python script (found in /usr/bin/wifite) using the steps mentioned here. To open wifite, use the command gedit /usr/bin/wifite. This will open up the source code of wifite. Then replace every occurence of cmd = [‘aireplay-ng’, with cmd = [‘aireplay-ng’,’–ignore-negative-one’,
Wifite can be found under Applications -> Kali Linux -> Wireless Attacks -> 802.11 Wireless Tools. Also, note that if you are running wifite in a different VM than Kali Linux, then you have to make sure that tools like airmon-ng, aireplay-ng, airodump-ng, aircrack-ng are already installed on that system. This is because Wifite is nothing but a wrapper over all these tools. Before we even start using Wifite, it is better to update to the latest version.

In my case, i already have the latest version. In this tutorial, we will be targeting a simple Wifi network with WEP encryption. Just using the command wifite -h will give you a list of all the commands.

A very tempting option would be -all which tries to attack every network that it finds. We will try it in later articles in this series. However, first lets take a look at all the targets that we have. To do that, use the command wifite -showb

Once this is done, we can see that wifite has put our network interface card into monitor mode (using airmon-ng) and started to look for clients. After a few more seconds, it will start displaying the list of access points.

Note that as it is mentioned in its feature list (automatically de-authenticates clients of hidden networks to reveal SSIDs), this list will also include hidden access points. Hence, wifite can also be used to find hidden access points. In this case we will attack an access point with the BSSID 00:26:75:02:EF:65 that i have set up for testing purposes. The access point has a simple WEP password 1234567890.

To start attacking an access point, just press Ctrl+C. Wifite will now ask you to choose a target number from the list. The target number for my test network is 1, so let me enter that. Note that if you press Ctrl+C again, it will quit Wifite.

You can now see that Wifite will start attempting to crack the WEP access point using the different known techniques for cracking WEP encryption. After some unsuccessful tries, it has finally begun to start attacking the access points using different techniques for cracking WEP.

Once enough IV’s are being captured, it will automatically start cracking the password.

As we can see, Wifite has successfully figured out the WEP key for the access point. Wifite is an extremely useful tool for cracking wireless networks. As i mentioned previously, you need to have all the tools like airmon-ng, aireplay-ng, airodump-ng, aircrack-ng already installed on your system. To further prove the point, let’s dive into the source code of Wifite.

As we can see, the python code has mentions of calling aireplay-ng. Hence, it is recommended to run Wifite inside Kali linux.
In the next article, we will look at some advanced usage options of Wifite.

In this article, we will look at cracking access points using WPA-PSK or WPA2-PSK using Wifite.
If you have used tools like airodump-ng, aircrack-ng etc to crack WPA access points before, you would know that the required thing to successfully crack a WPA-PSK network is a captured WPA four-way handshake. More details about the WPA four-way handshake can be found on this wikipedia page.

As mentioned in the previous article, there is a bug in Wifite that may or may not be there in your particular version of Wifite. The bug basically doesn’t aireplay-ng to function properly and displays an error like aireplay-ng exited unexpectedly . In order to fix this, you will have to make slight modifications in the code of wifite. You can install gedit (apt-get install gedit) which is a text editor and then edit the wifite python script (found in /usr/bin/wifite) using the steps mentioned here. To open wifite, use the command gedit /usr/bin/wifite. This will open up the source code of wifite. Then replace every occurence of cmd = [‘aireplay-ng’, with cmd = [‘aireplay-ng’,’–ignore-negative-one’,
To start wifite for cracking a WPA access point, give it the option -wpa to only target WPA networks. Also, give it a dictionary file as an input for cracking the WPA passphrase with the -dict option. In kali linux, the wordlists are stored at the location /usr/share/wordlists. Wifite will now start scanning for WPA access points.

Press Ctrl+C to give a target number. In my case, the target number is 2 which is an access point i have configured for testing purposes. The access point uses WPA2-PSK encryption with the key as “password”.

Wifite will now start listening for the handshake. Once it has found it, it will automatically start cracking the passphrase using the dictionary file that we supplied.

And as you can see, Wifite has successfully found the passphrase for the access point.
Sometimes, things may not work as smoothly. In order to capture a WPA handshake between the client and the access point, the client has to connect to the wireless network during that period when we are monitoring the network. If the client is already connected, there will be no handshake that is captured. Wifite does this by automatically sending deauthentication packets to a particular client or a broadcast deauthentication packet if it is required. You can specify the time between deauthentication packets using the -wpadt flag. Hence, when the client tries to reconnect to the access point, the handshake is captured.
You can also specify which tool you want to use to crack the passphrase once the four-way handshake has been successfully captured. By default, aircrack-ng is selected. You can also use cowpatty, pyrit or tshark to crack the passphrase.

Another cool option in Wifite is to anonymize your MAC address using the -mac option. Even though it is quite trivial using simple commands or macchanger utility to change the MAC address for a specific interface, it is good to have this feature in the tool itself. However, in order to make this work, you first have to take that specific interface for which you want to change the MAC address down to managed mode if it is in monitor mode previously. You can use the command iwconfig to check all the interfaces that are in monitor mode and then take them down using the command airmon-ng stop interface-name command. As we can see from the image below, the mon0 interface is in monitor mode.

Hence, lets take it down using the command airmon-ng stop mon0
.
Now we can add the -mac option to anonymize the MAC address. As you can see, Wifite is intelligent enough to change the MAC address to something that is similar the existing MAC address of the interface and not to something ridiculous (for e.g AA:BB:CC:DD:EE:FF) which is a giveaway.

And when you stop the capture, Wifite is nice enough to change the MAC address back to the original one.
In this article, we looked at how we can use Wifite to crack networks using WPA-PSK or WPA2-PSK. Wifite is great at its job and automates almost everything, however it is important to understand how it uses the tools like airodump-ng, aircrack-ng etc under the hood to perform its task. I would recommend that you go through the source code of Wifite and figure out how this is done.


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