You think your Wifi is Safe? Rob Gillen @argodev 

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Don’t Be Stupid The following presentation describes real attacks on real systems. Please note that most of the attacks described would be considered ILLEGAL if attempted on systems that you do not have explicit permission to test and attack. I assume no responsibility for any actions you perform based on the content of this presentation or subsequent conversations. Please remember this basic guideline: With knowledge comes responsibility. 

Disclaimer The content of this presentation represents my personal views and thoughts at the present time. This content is not endorsed by, or representative in any way of my employer nor is it intended to be a view into my work or a reflection on the type of work that I or my group performs. It is simply a hobby and personal interest and should be considered as such. 

Overview • Pre-Requisite Knowledge • Various Security Approaches • Tools and Attacks 

Required Gear • Network Adapter that supports “Monitor” mode. – Equivalent to promiscuous mode on a normal NIC • Windows, MAC, or Linux – Linux tools tend to be more readily available 

Wireless Packet Frames • Management Frames – Authentication – De-authentication – Association Request – Association Response – Re-association Request – Re-association Response – Disassociation – Beacon – Probe Request – Probe Response • Control Frames – Request to Send (RTS) – Clear to Send (CTS) – Acknowledgment (AWK) • Data Frames 

Packet Sniffing • Filters: – wlan.fc.type • == 0 (mgmt frames) • == 1 (control frames) • == 2 (data frames) – wlan.fc.subtype • == 8 (beacons) • (wlan.fc.type == 0) && (wlan.fc.subtype == 8) 

Packet Sniffing • Determine the channel of the network we are interested in – required for sniffing data packets – airodump-ng • iwconfig mon0 channel 11 (demo pre/post) 

Packet Injection • aireplay-ng – Inject packets onto a specific wireless network without specific association to that network – Can target specific channels, mask MAC addresses, etc. – Does not require association 

Regulatory Issues • Available Channels • Radio Power Levels – iw reg set US – iw reg set BO 

DEMO: HIDDEN SSID 

DEMO: Hidden SSID • Show packet capture with the SSID • Hide SSID • Prove it is now hidden • Solve for X – Passive (wait for valid client) – wireshark filter – Use aireplay-ng to send deauth packet to force the discovery • Probe Request/Probe Response packets 

DEMO: MAC FILTERS 

DEMO: MAC Filters • Enable MAC Filtering on the WAP • Prove that a client cannot connect • Use airodump-ng to show associated clients • Use macchanger to spoof the whitelisted address and connect. 

DEMO: SHARED KEY AUTHENTICATION 

DEMO: Shared Key Authentication • Illustration (steal picture from Wikipedia/netgear?) • Configured AP for Shared Key/Update Client • Use airodump-ng to capture/log the authentication scheme + keystream – Wait for valid client or send deauth pkt • Use aireplay-ng to pass back the captured auth pkt • TIP: DOS by filling up AP tables (wrapper around airreplay-ng) 

DEMO: WEP ENCRYPTION 

DEMO: WEP Encryption • Capture data packets (ARP) from a known/trusted client (airodump-ng) • Replay them/re-inject between 10- 100,000 times (aireplay-ng) • Crack them (aircrack-ng) • “Guaranteed” crack 

DEMO: WPA/2 ENCRYPTION 

DEMO: WPA/2 Encryption • Vulnerable to dictionary attacks • Collect authentication handshake • Select dictionary file and run the cracker • Works for WPA, WPA2, AES, TKIP 

Tools 

Tools • Jasegar (Pineapple IV) • I can be anything you want me to be 

Man-In-The-Middle 

Man-In-The-Middle 

Man-In-The-Middle 

Man-In-The-Middle 

Tools • Reaver Pro (WPS Exploit) • 4-10 hours and your network is mine 

What is Safe? • Stop using Wi-Fi • Avoid open Wi-Fi networks • Always use SSL • Use VPN • Disable Auto-Connect… on *all* devices • Hard/complex network keys • WPA-Enterprise / RADIUS / PEAP / EAP-TTLS • Disable WPS! 

Equipment List • Two Laptops • Any Wireless Access Point • Alfa Card http://www.amazon.com/gp/product/B002BFMZR8 • Yagi Antenna http://www.amazon.com/gp/product/B004L0TKW4 • Reaver Kit http://hakshop.myshopify.com/products/reaver -pro • WiFi Pinapple http://hakshop.myshopify.com/collections/fro ntpage/products/wifi-pineapple 

Learning More • http://www.securityfocus.com • http://www.aircrack-ng.org • http://raulsiles.com/resources/wif i.html • http://www.willhackforsushi.com 

Questions/Contact Rob Gillen [email protected] http://rob.gillenfamily.net @argodev