Wireless Hacking. Chun-Jen (James) Chung. Arizona State University
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1 Wireless Hacking Chun-Jen (James) Chung
2 Wireless Equipment
3 Windows x. Linux Windows Wireless NIC drivers are easy to get Wireless hacking tools are few and weak Unless you pay for AirPcap devices or OmniPeek Linux Wireless NIC drivers are hard to get and install Wireless hacking tools are much better
4 OmniPeek WildPackets now packages AiroPeek & EtherPeek together into OmniPeek A Windows-based sniffer for wireless and wired LANs Only supports a few wireless NICs
5 Chipsets of Wireless Cards For Linux, the best chipsets to use are Orinoco, Prism2.x/3, Atheros, and Cisco A good resource is at Madwifi Go to
6 Antennas Omnidirectional antenna sends and receives in all directions Directional antennas focus the waves in one direction The Cantenna shown is a directional antenna
7 Quad stacked antenna Stacked Antennas Four omnidirectional antennas combined to focus the beam away from the vertical Beamwidth: 360 Horizontal, 15 Vertical Can go half a mile or more see right
8 WISPer Uses "multi-polarization" to send through trees and other obstructions
9 Global Positioning System (GPS) Locates you using signals from a set of satellites Works with war-driving software to create a map of access points
10 Pinpoint your Location with Wi-Fi Skyhook uses wardriving to make a database with the location of many Wi-Fi access points Can locate any portable Wi-Fi device An alternative to GPS
11 iphone vs. Android The iphone combines GPS, Wi-Fi, and cell tower location technology to locate you You can wardrive with the Android phone and Wifiscan
12 War-Driving Software
13 Terms Service Set Identifier (SSID) An identifier to distinguish one access point from another Initialization Vector (IV) Part of a Wired Equivalent Privacy (WEP) packet Used in combination with the shared secret key to cipher the packet's data
14 NetStumbler Very popular Windows-based war-driving application Analyzes the header and IV fields of the wireless packet to find: SSID MAC address WEP usage and WEP key length (40 or 128 bit) Signal range Access point vendor
15 How NetStumbler Works NetStumbler broadcasts Probe Requests All access points in the area send Probe Responses containing network configuration information, such as their SSID and WEP status It can also use a GPS to mark the positions of networks it finds
16 NetStumbler Screen
17 NetStumbler Countermeasures NetStumbler's relies on the Broadcast Probe Request Wireless equipment vendors will usually offer an option to disable this feature, which effectively blinds NetStumbler But it doesn't blind Kismet
18 Kismet Linux and BSD-based wireless sniffer Allows you to track wireless access points and their GPS locations like NetStumbler Allow spectrum analysis (with Wispy) Sniffs for packets, such as Beacons and Association Requests Gathers IP addresses and Cisco Discovery Protocol (CDP) names when it can Kismet Countermeasures There's not much you can do to stop Kismet from finding your network
19 Kismet Features Windows version Runs on cygwin, only supports two types of network cards Airsnort compatible weak-iv packet logging, however airsnort is too OLD, use aircrack-ng instead. Runtime decoding of WEP packets for known networks
20 Kismet You can use Backtrack However, here our demo is based on ubuntu, NIC Atheros AR5001X+, internal wireless card. Madwifi
21 Kismet Screenshot
22 Wardriving Finding Wireless networks with a portable device Image from overdrawn.net
23 Vistumbler ( Find Wireless access points GPS Support Compatible with Netstumbler Export access point GPS locations to a google earth kml file Live Google Earth Tracking - Auto KML automatically shows access points in google earth. Speaks Signal Strength using sound files, windows sound api, or MIDI Open Source
24 Cain ( It uses the Winpcap Packet Driver to control the wireless network card. Access points and ah-hoc networks are enumerated using OIDs from Windows DDK at intervals of five seconds and WLANs parameters (MAC address, SSID, Vendor, WEP Encryption, Channels... ) are displayed in the scanner list. With Abel, it can crack WEP s password
25 WiGLE ( Collects wardriving data from users Has over 16 million records Mill Ave Tempe as of 4/22/09
26 Wireless Scanning and Enumeration Goal of Scanning and Enumeration To determine a method to gain system access For wireless networks, scanning and enumeration are combined, and happen simultaneously
27 Wireless Sniffers Not really any different from wired sniffers There are the usual issues with drivers, and getting a card into monitor mode
28 Wireshark WiFi Enable the wireless device in monitor mode
29 Identifying Wireless Network Defenses
30 SSID SSID can be found from any of these frames Beacons Sent continually by the access point (unless disabled) Probe Requests Sent by client systems wishing to connect Probe Responses Response to a Probe Request Association and Reassociation Requests Made by the client when joining or rejoining the network If SSID broadcasting is off, just send adeauthentication frame to force a reassociation
31 MAC Access Control Each MAC must be entered into the list of approved addresses High administrative effort, low security Attacker can just sniff MACs from clients and spoof them
32 Gaining Access (Hacking )
33 Specifying the SSID In Windows, just select it from the available wireless networks Click on set up a wireless network from a home or small office. And then input the SSID
34 Changing your MAC In Windows Vista Rund regedt32 Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4 D36E972-E325-11CE-BFC BE10318} Find REG_SZ name NetworkAddress and change it SMAC is easier
35 Device Manager Many Wi-Fi cards allow you to change the MAC in Windows' Device Manager
36 Attacks Against the WEP Algorithm Brute-force keyspace takes weeks even for 40- bit keys (use Cain & Abel) Collect Initialization Vectors, which are sent in the clear, and correlate them with the first encrypted byte This makes the brute-force process much faster
37 Tools that Exploit WEP Weaknesses Aircrack-ng or AirSnort (old) kismet Cain & Abel WLAN-Tools DWEPCrack WEPAttack Cracks using the weak IV flaw Best countermeasure use WPA/WPA2
38 WEP Crack Demo This demo is conducted in my home (please do not try it again Network configuration.
39 Run kismet to discover networks
40 Look at details about DJWLAN
41 Look at who connect to DJWLAN
42 Run airodump to capture client traffic
43 Use aireplay-ng to replay the captured packet for re-authentication
44 Use aireplay-ng to replay the captured packet to faster the IV iteration
45 Use aircrack-ng to crack my WEP
46 HotSpotter Hotspotter--Like SSLstrip, it silently replaces a secure WiFi connection with an insecure one Works because Windows allows it, apparently happy to accept an insecure network as part of the same WLAN
47 Lightweight Extensible Authentication Protocol (LEAP)
48 What is LEAP? A proprietary protocol from Cisco Systems developed in 2000 to address the security weaknesses common in WEP LEAP is an 802.1X schema using a RADIUS server As of 2004, 46% of IT executives in the enterprise said that they used LEAP in their organizations
49 The Weakness of LEAP LEAP is fundamentally weak because it provides zero resistance to offline dictionary attacks It solely relies on MS-CHAPv2 (Microsoft Challenge Handshake Authentication Protocol version 2) to protect the user credentials used for Wireless LAN authentication
50 MS-CHAPv2 MS-CHAPv2 is notoriously weak because It does not use a SALT in its NT hashes Uses a weak 2 byte DES key Sends usernames in clear text Because of this, offline dictionary and brute force attacks can be made much more efficient by a very large (4 gigabytes) database of likely passwords with precalculated hashes
51 Cisco's Defense LEAP is secure if the passwords are long and complex 10 characters long with random upper case, lower case, numeric, and special characters The vast majority of passwords in most organizations do not meet these stringent requirements Can be cracked in a few days or even a few minutes
52 LEAP Attacks
53 Anwrap Performs a dictionary attack on LEAP Written in Perl, easy to use
54 Asleap Grabs and decrypts weak LEAP passwords from Cisco wireless access points and corresponding wireless cards Integrated with Air-Jack to knock authenticated wireless users off targeted wireless networks When the user reauthenticates, their password will be sniffed and cracked with Asleap
55 Countermeasures for LEAP Enforce strong passwords Continuously audit the services to make sure people don't use poor passwords
56 WPA/WPA2 WPA/WPA2 is strong No major weaknesses However, if you use a weak Pre-Shared Key, it can be found with a dictionary attack Tool: Aircrack-ng
57 Denial of Service (DoS) Attacks Radio Interference a, 11b, and 11g all use the GHz ISM band, which is extremely crowded at the moment Unauthenticated Management Frames An attacker can spoof a deaauthentication frame that looks like it came from the access point wlan_jack in the Air-Jack suite does this
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