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Cracking WPA/WPA2 in the Cloud

Cracking WPA/WPA2 in the Cloud. Vivek Ramachandran Founder, SecurityTube.net. Shameless Self Promotion. B.Tech , ECE IIT Guwahati. Caffe Latte Attack Toorcon 9. WEP Cloaking Defcon 19. 802.1x, Cat65k Cisco Systems. Media Coverage CBS5, BBC. Trainer, 2011. Wi-Fi Malware, 2011.

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Cracking WPA/WPA2 in the Cloud

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  1. Cracking WPA/WPA2 in the Cloud Vivek Ramachandran Founder, SecurityTube.net

  2. Shameless Self Promotion B.Tech, ECE IIT Guwahati Caffe Latte Attack Toorcon 9 WEP Cloaking Defcon 19 802.1x, Cat65k Cisco Systems Media Coverage CBS5, BBC Trainer, 2011 Wi-Fi Malware, 2011 Microsoft Security Shootout

  3. Backtrack 5 Wireless Penetration Testing http://www.amazon.com/BackTrack-Wireless-Penetration-Testing-Beginners/dp/1849515581/

  4. SecurityTube.net Training Students in 75+ Countries

  5. Pentester Academy

  6. Agenda • WPA/WPA2 Cracking • Using Cloud Services • Architecture • Infrastructure vs Platform as a Service • Automation Tool

  7. WPA-Personal – Passphrase Based Pre-Shared Key 256 bit PBKDF2 Passphrase (8-63)

  8. Eavesdropping the 4 Way Handshake Supplicant Authenticator Probe Request-Response Authentication RR, Association RR Pre-Shared Key 256 bit Pre-Shared Key 256 bit Message 1 ANounce Snounce PTK PTK Message 2 Snounce + MIC Message 3 Key Installation Key Installed Message 4 Key Install Acknowledgement Key Installed

  9. WPA-PSK Dictionary Attack 4 Way Handshake SNonce ANonce AP MAC Client MAC Pre-Shared Key 256 bit PBKDF2 (SSID) PTK Passphrase (8-63) Dictionary Verify by Checking the MIC

  10. Open Source Tools Available!

  11. PBKDF2 • Password Based Key Derivation Function • RFC 2898 • PBKDF2(Passphrase, SSID, ssidLen, 4096, 256) • 4096 – Number of times the passphrase is hashed • 256 – Intended Key Length of PSK

  12. PMK Generator Architecture Wordlist Generator PMK Generator SQL Database Amazon RDS SSID List

  13. Worker Architecture Master Worker-1 Worker-2 Worker-3 Amazon SQS (Message Queue) Worker-4 Worker-5 Worker-6

  14. Distributed Message Queue

  15. Relational Database in the Cloud

  16. Workflow • Distributed password list creator • Password and SSID inserted into Message Queue • Worker machines create PMK from (Password, SSID) and store in Amazon RDS

  17. Handshake Verification PMK, Handshake Master Worker-1 Worker-2 Worker-3 Amazon SQS (Message Queue) Worker-4 Worker-5 Worker-6

  18. Benchmark • 1000 PMKs created / Second / Instance • 130,000 PMK Verifications / Second / Instance • 100 Worker Instances were run

  19. Costs Involved – PMK Creation • Total cost of 100 instances / hour - $6 • Total PMK Creation - 360 million/ hour • Cost of startup amortized • Stored for future use for a given SSID – Wordlist combination

  20. Costs Involved – PMK Verification • Total cost of 100 instances / hour - $6 • Total PMK Verifications - 45 Billion / hour • Cost of startup amortized • Permutation based WordList only to be generated once

  21. Google AppEngine

  22. Architecture PMK, Handshake Resident Instance Task-1 Task-2 Task-3 POST based Data Passing Task-4 Task-5 Task-6

  23. Chigu - Amazon EC2 • Automatically setup multiple machines on EC2 with pre-created AMI • Bring up master, upload “job” • Job consists of the following: • Wordlist Creation • PMK generation • Handshake verification

  24. Chigu in Action

  25. Chigu Public Release • Beta release available now • Testers please email vivek@securitytube.net • Version 1 to be released March 15th 2014 • Custom AMI for Amazon and Controller • Google Appengine Application and Controller • http://Chigu.SecurityTube.net

  26. WPA-Enterprise Authenticator Authentication Server Supplicant Association EAPoL Start EAP Request Identity EAP Request Identity EAP Response Identity EAP Packets EAP Packets EAP Success EAP Success PMK to AP 4 Way Handshake Data Transfers

  27. Source: Layer3.wordpress.com

  28. MS-CHAPv2 Cracked in Minutes

  29. CloudCracker.com

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