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How to Crack WPA2 WiFi Password Using Reaver (99%)

Written By Akademy on Wednesday, March 15, 2017 | 3:05 AM

WPS exists in most routers for easy setup process through the WPS pin, which is hard-coded into the wireless access point. Reaver takes the advantage of a vulnerability in WPS. Thanks to Craig Heffner for releasing an open-source version of this tool named Reaver that exploits the vulnerability. In simple terms, Reaver tries to bruteforce the pin; which will reveal the WPA or WPA2 password after enough time.
 NOTE: This tutorial is for Educational Purposes Only!
What You’ll Need
You do not have to be a expert at Linux or at using a computer. The simple command-line (console ) will do it all. You may need a fair bit of time for this process and maybe also some luck. The brute force may take from 2 hours to more than 10 hours. There are various ways to set up Reaver, but here are the requirements for this guide.
  • Backtrack OS. Backtrack is a bootable Linux distribution with lots of pen-testing tools. You can use various other Linux distribution but I prefer Backtrack. If you don`t know how to install Backtrack then please check this link first.
  • Computer and wireless network card. I cannot guarantee this will work with all the internal wireless card. I recommend a external wireless card.
  • Patience. The process is simple but brute forcing the PIN takes time. So you have to be patient. Kicking the computer won’t help.
Let’s Get Started
Have a Backtrack OS ready for action.
UPDATE: Use Kali Linux instead of Backtrack. See Backtrack is dead – Long Live Kali Linux
Step 1: Boot into BackTrack
You can use any method to boot into Backtrack eg. from live CD, VMware, dual boot, etc. Boot it first into the GUI mode and open up a new console (command line) which is in the taskbar. Then boot into backtrack. During the boot process, BackTrack will prompt you to to choose the boot options. Select “BackTrack Text – Default Boot Text Mode” and press Enter.
After some time Backtrack will take you into a command line prompt where you should type startx and press Enter. BackTrack will boot will into Graphical User Interface (GUI) mode.
Step 2: Install Reaver (Skip this step if you are using BackTrack 5)
Reaver should be already installed in the Backtrack 5 but if you are using an older version of Backtrack or any other Linux distribution, you can install Reaver by using the steps below.
  1. First Connect your BackTrack to the internet. For WiFi connection go to Application > Internet > WICD Network Manager.
  2. Select your network and click connect and input your password if necessary, click OK and click CONNECT the second time.
Now that you are connected to internet, it’s time to install Reaver. Click the terminal icon in the menu bar. And at the console type the following:
apt-get update
apt-get install reaver
Now if everything worked fine you will get a freshly installed Reaver tool. If you are testing it in your own system, please go to WICD Network Manager and Disconnect yourself first!
Step 3 : Gather Information
Before launching the Reaver attack, you need to know your target wireless network name or BSSID. This is the series of unique letters and number of a particular router, and you will need its channel number too. To find this, make your wireless card go into monitor mode, and gather the required information from the access points. Let’s go.
First lets find your wireless card. Inside terminal or console, type:
airmon-ng
Press Enter and you should see a list of interface names of different devices. There should be a wireless device in that list connected to BackTrack. Probably it may be WLAN0 or WLAN1.
crack WPA2 WiFi password using reaver
Note: To connect your wireless network card into WMware, firstly, connect it to the USB. You will see a small USB icon that looks like the figure in the top right of VMware. Right-click on the icon and click connect. The USB sign will turn green and start to glow.
crack WPA2 WiFi password using reaver
Enable monitor mode. Assuming your wireless card interface name is WLAN0, type this command in that same console.
airmon-ng start wlan0
This code will create a new monitor mode interface mon0 as in the screenshot below. Keep note of the code.
crack WPA2 WiFi password using reaver
Search the BSSID of the Access Point(router) you want to crack. There are few ways to search for the Access Point BSSID, but I prefer to use the inbuilt Reaver search method which shows the list of WPS-vulnerable BSSIDs only.
In the console, type this following command and press enter:
wash -i mon0
You will see the list of wireless networks that support WPS and are vulnerable to Reaver as seen in the screenshot below. After few minutes you can stop the scan by pressing Ctrl+C.
crack WPA2 WiFi password using reaver
Step 4: Let’s Start Cracking
I suggest you to try to crack the ones which have WPS lock disabled or say “NO” in WPS Locked column. It may also work if it says YES but I am not sure of that. For that, copy the BSSID of the target AP and also keep note of its channel. In the console, type the following then Enter:
reaver -i monitormode -c channel -b targetbssid -vv
In my case the monitor mode will be mon0 channel 1, targetbssid would be C8:3A:35:54:88:81
-vv is written to show the current statistic of the attack as a percentage completed, currently brute forcing PIN and so on; so we will type the following and enter:
reaver -i mon0 -c 1 -b C8:3A:35:54:88:81 -vv
Press Enter and you should see the attack process as in the screenshot below.
Please note that you will not get “Restore previous session…”  at this point, because I already tried to crack it,  and it’s prompting me to resume from that paused point.
Your progress will also be saved if you press Ctrl+C. It will then prompt you in the same way, if you again hit the command, and you can resume it from there.
crack WPA2 WiFi password using reaver
Now just wait or have some coffee and let Reaver do its magic. It might take from 2 hours to 10 hours or more. There are 8 numeric digits of WPS, but the WPS authentication protocol cuts the pin in half and validates each half separately. Since the last digit of pin is a cheksum value, which can be calculated on the basis of previous value, there are 10^4=10,000 possible values for first half and then 10^3=1000 values for the last pin. So the WPS pin code is one of 11,000 possible pin codes. Some APs can check the WPS pin at the rate of 1 pin per second. Some take more so it depends upon the AP, and also the network connection.
When the PIN is successfully brute-forced, Reaver will show you the WPS PIN and the plain password of the AP like in the below screenshot.
crack WPA2 WiFi password using reaver
I recommend you keep note of the WPS pin, so that if the password is changed again you can hack that in few seconds the next time by using the following process.
reaver -i (monitor interface) -b (BSSID) -c (channel) --pin=(8 digit pin) -vv
Example:
reaver -i mon0 -b 11:22:33:44:55:66 -c 1 --pin=12345678 -vv
So now the error part… as you might get a bunch of errors depending upon your conditions. You might get some timeout but that’s normal. If you are getting other errors, see the below Error Section.
Error Section:
  • If 10 consecutive unexpected WPS errors are encountered, a warning message will be shown. This may be a sign that the AP is rate limiting pin attempts. A waiting command can be issued whenever these warning messages appear. Use the following command:
reaver -i mon0 -b 00:01:02:03:04:05 --fail-wait=360
  • The default receive timeout period is 5 seconds. This timeout period can be set manually if necessary (minimum timeout period is 1 second):
reaver -i mon0 -b 00:01:02:03:04:05 -t 3
  • The default delay period between pin attempts is 1 second. This value can be increased or decreased to any value. Please note that 0 means no delay:
reaver -i mon0 -b 00:01:02:03:04:05 -d 0
Here ends the tutorial on how to crack wireless network easily using Reaver. Good Luck!
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