You think your Wifi is Safe?

Slides from my talk at CodeStock 2012 on wireless network security.

Transcript

1. You think your Wifi is Safe? Rob Gillen @argodev
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3. wintellect.com Founded by top experts on Microsoft – Jeffrey Richter, Jeff Prosise, and John Robbins – our mission is to help our customers achieve their goals through advanced software-based consulting and training solutions. Consulting & Debugging • Architecture, analysis, and design services • Full lifecycle custom software development • Content creation • Project management • Debugging & performance tuning Training • On-site instructor-led training • Virtual instructor-led training • Devscovery conferences Design • User Experience Design • Visual & Content Design • Video & Animation Production what we do who we are how we do it consulting training debugging design
4. 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.
5. 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.
6. Overview • Pre-Requisite Knowledge • Various Security Approaches • Tools and Attacks
7. 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
8. 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
9. 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)
10. 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)
11. 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
12. Regulatory Issues • Available Channels • Radio Power Levels – iw reg set US – iw reg set BO
13. DEMO: HIDDEN SSID
14. 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
15. DEMO: MAC FILTERS
16. 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.
17. DEMO: SHARED KEY AUTHENTICATION
18. 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)
19. DEMO: WEP ENCRYPTION
20. 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
21. DEMO: WPA/2 ENCRYPTION
22. DEMO: WPA/2 Encryption • Vulnerable to dictionary attacks • Collect authentication handshake • Select dictionary file and run the cracker • Works for WPA, WPA2, AES, TKIP
23. Tools
24. Tools • Jasegar (Pineapple IV) • I can be anything you want me to be
25. Man-In-The-Middle
26. Man-In-The-Middle
27. Man-In-The-Middle
28. Man-In-The-Middle
29. Tools • Reaver Pro (WPS Exploit) • 4-10 hours and your network is mine
30. 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!
31. 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
32. Learning More • http://www.securityfocus.com • http://www.aircrack-ng.org • http://raulsiles.com/resources/wif i.html • http://www.willhackforsushi.com
33. Questions/Contact Rob Gillen rob@gillenfamily.net http://rob.gillenfamily.net @argodev