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• 12/31/04 - Cisco users on Windows should choose the DWL-650 card type
• 12/25/04 - Released version 0.2.7c. Bug fixes and support for DWL-650 card in Windows
• 12/20/04 - Released version 0.2.7b. Bug fixes and improved handling of Korek/Aircrack attack initiation/execution
• 12/18/04 - Released airsnort-0.2.7. Incorporates aircrack style cracking in real time.
• 09/22/04 - Released airsnort-0.2.6. Greatly improved Windows stability along with other stability improvements as well.
• 09/05/04 - Released airsnort-0.2.5. This release includes a compiled Windows binary (tested on XP only). See Windows information for more details. Make sure you read README.win
• 02/19/04 - Pavel Roskin just let me know that the CVS version of the orinoco drivers now supports monitor mode via the iwconfig interface! Airsnort in CVS supports these latest changes to the orinoco drivers.
• 02/17/04 - Adrian Woodley has ported the orinoco patch for use with kernel 2.6.2. Get it from the orinoco info page
• 01/15/04 - Posted my libnids-1.18 patch to enable recognition of DLT_PRISM_HEADER (the data link type used by prism cards). This is a better fix to allow dsniffing in monitor mode as DLT_IEEE802_11 has been supported since version 1.16. Download patch and build libnids-1.18, then rebuild a stock version of dsniff to make use of it. You no longer need to use the dsniff below. Get the libnids patch here: libnids-1.18-snax-prism-modified.diff.
• 12/09/03 - GUI updated to gtk+-2.2
• Old news
  

Introduction

802.11b, using the Wired Equivalent Protocol (WEP), is crippled with numerous security flaws. Most damning of these is the weakness described in " Weaknesses in the Key Scheduling Algorithm of RC4 " by Scott Fluhrer, Itsik Mantin and Adi Shamir. Adam Stubblefield was the first to implement this attack, but he has not made his software public. AirSnort, along with WEPCrack, which was released about the same time as AirSnort, are the first publicly available implementaions of this attack.

AirSnort requires approximately 5-10 million encrypted packets to be gathered. Once enough packets have been gathered, AirSnort can guess the encryption password in under a second.

AirSnort 0.2.6 Requirements

• Cisco Aironet
• Prism2 based cards using wlan-ng drivers or Host-AP drivers
• Orinoco cards and clones using patched orinoco_cs drivers
• Orinoc cards using the latest Orinoco drivers >= 0.15 with built in monitor mode support
• And many others.
• Windows: Any(?) card supported by Airopeek.

For Linux users, the best resources for finding out if your card can do monitor mode and what drivers you will need are those maintained at the Kismet site.

To compile AirSnort, do the following:

• Get your drivers working! To do this you may need one or more of the following
  • Kernel source
  • PCMCIA CS package
    
  • wlan-ng package
    
  • Orinoco driver patches
    
  • Host AP drivers
    

• Install the LATEST version of libpcap. Please make sure that you have removed any old version of pcap that may be resident on your system. (not required for Windows users.)

• Make sure you have gtk+-2.2 installed as AirSnort is a gui application. You will also need gtk+-devel

• Linux users perform the following steps

      # tar -xzf airsnort-0.2.6.tar.gz
      # cd airsnort-0.2.6
      # ./configure
      # make
      # make install       (optional)
      

• Poof you're done. The airsnort executable is in the airsnort-0.2.6/src subdirectory, do with it what you will. There are some man pages in airsnort-0.2.6/man
• Windows users: see the Windows info page.

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Download the tarballs from Sourceforge

Apple iBook Info

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Old News

• 08/08/03 - Posted my dsniff patches to allow dsniffing in monitor mode. Get it here dsniff-2.3-monitor-patch.tar.gz.
• 08/07/03 - Ported the orinoco patch to the orinoco-0.13d and 0.13e drivers. Get it from the orinoco info page.
• 02/22/03 - Monitor mode patch for orinoco-0.13b is available on orinoco info page.
• 02/19/03 - Windows information Some background information on the windows porting effort. Worth a read if you are going to attempt to build Airsnort on Windows.
• 02/15/03 - Airsnort on Windows? Its working in alpha, but requires some effort to install. If patching the orinoco drivers is too much for you then this is probably not for you either. I hope to have more shortly. Most of the code is already in CVS, but the installation instruction instructions are not available yet.
• 02/07/03 - Ritchie@tipsybottle.com has a nice HOWTO on RedHat 8.0 + Orinoco + Kismet here Much of the info is applicable to airsnort as well.
• 09/25/02 - The problems with v8.10 firmware may have been solved thanks to the troubleshooting efforts of Ian Goldberg and Pat Swieskowski. Try the patch for pcmcia-cs-3.2.1 available on the orinoco info page. This patch should also apply to pcmcia-cs-3.2.0 though I have not tested it.
• 08/31/02 - Pat Swieskowski has also posted some info on using Airsnort on an Apple iBook. See the page - http://www.swieskowski.net/code/wifi.php
• 08/27/02 - Erik Winkler has posted some info on using Airsnort on an Apple iBook. See the page - http://www.macunix.net:443/ibook.html
• 08/17/02 - Released Airsnort-0.2.1b which fixes bug in gencases and decrypt.
• 08/16/02 - Ported the orinoco patch to the pcmcia-cs-3.2.0 drivers. Get it from the orinoco info page. David Gibson has declared the orinoco-0.12 series a failed experiment and I have removed the patch for 0.12 drivers.
• 06/20/02 - Ported the orinoco patch to the 0.12 drivers. Get it from the orinoco info page.
• 06/08/02 - Got off my butt and updated the orinoco driver capabilities. Posted a patch to the orinoco-0.11b drivers to enable monitor mode AND allow setting of your own MAC address via ifconfig. Get it from the orinoco info page.
• 06/07/02 - Released Airsnort-0.2.1a, primarily a maintenance release. This release fixes a bug in weak IV reporting and removes gnome dependencies. The decrypt tool is more like a dictionary based cracker now, but still has a way to go.
• 06/02/02 - Successful downgrade for Orinoco v8.10 firmware users. See the Orinoco information page for details.
• 05/03/02 - The project finally has a logo! It was derived with the permission of Marty Roesch over at the Snort project which you should certainly check out if you haven't already.
• 05/01/02 - Airsnort 0.2.1 released - requires libpcap. Limited support for Cisco cards. Changes here
• 04/17/02 - Updated the orinoco patches to correct a problem when receiving beacon packets (and perhaps others?) Thanks to jonp@chem.... !!
• 04/12/02 - Just released - Decrypt is a program to decrypt data packets in pcap style capture files.
• 04/10/02 - The faq has been updated
• 03/19/02 - New Patches available. See the new Orinoco info page.  Also see the updated faq for answers to questions about monitor mode, promiscuous mode, PF_NETLINK, and PF_PACKET.
• 03/14/02 - patch-0.2.0-1 for Airsnort 2.0 posted. orinocoSniff.c updated to fix problems with SIOCIWFIRSTPRIV
• 03/07/02 - New Orinoco patch for pcmcia-3.1.33/orinoco-0.09b
• 02/28/02 - AirSnort 2.0 released.  Read about changes.
• 08/23/01 - Frequently Asked Questions we wrote in response to a bunch of our emails
• 08/20/01 - We got written up by Wired News.