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dsniff

dsniff. Outline. Objective dsniff toolbox How to use them to find out secret. Objective. Collect the secret information from network. Description. Is a sniffer like tcpdump, comm view but dsniff focus on ID,PW Dsniff is a collection of tools for network. Sniffer toolbox. Spoofing tools

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dsniff

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  1. dsniff

  2. Outline • Objective • dsniff toolbox • How to use them to find out secret

  3. Objective • Collect the secret information from network

  4. Description • Is a sniffer like tcpdump, comm view but dsniff focus on ID,PW • Dsniff is a collection of tools for network

  5. Sniffer toolbox • Spoofing tools • Arpspoof • Dnsspoof • Macof • TCP tools • Tcpkill • Tcpnice • Sniffer tools • Dsniff • Filesnarf • Msgsnarf • Sshmitm • Urlsnarf • Webmitm • Webspy

  6. Install dsniff • Require • OS: Gentoo Linux x86 • #emerge dsniff • http://www.monkey.org/~dugsong/dsniff/

  7. Arpspoof • ARP (Address Resolution Protocol) • IP=>Ethernet MAC Address …  --Reply-- I’m 10.0.0.1 My MAC address is….. --Broadcast-- Hey everyone which Ethernet Card has IP 10.0.0.1 … 

  8. Network Environment Note: IP forward must be enable

  9. Arpspoof- action ! • Mike before attack • Action ! • Bingo ! After attack Original

  10. Dnsspoof • DNS runs on UDP protocol • Send out a forge query and response

  11. Network Environment

  12. Dnsspoof Oh…. Ya…. INSA was dead… • Create DNS query file • Dnsspoof go! Wow… Our heaven INSA

  13. Dsniff • Password sniffer • FTP, telnet, SMTP, POP, HTTP

  14. Network Environment

  15. Dsniff-catch Mike’s password • Setup the “mousetrap” • Enjoy password

  16. Macof • Cause switch act like a hub MAC Port 00:0C:6E:0B:A9:36 1 00:40:F4:8B:AC:15 3 00:0E:A6:42:AC:D1 6 1 K 4 K

  17. Network Environment

  18. Macof- confuse switch

  19. Msgsnarf • Instant message sniffer • MSN, Yahoo messenger, ICQ, IRC • Search specify pattern

  20. Network Environment

  21. Msgsnarf-get the secret talk

  22. Sshmitm • SSH monkey-in-the-middle • Relay session • Capturing SSH password logins • Hijacking interactive sessions. • Only SSH protocol version 1

  23. Network Environment

  24. Sshmitm show time Roy Attack1 Mike

  25. Tcpkill • Kill a TCP connection by spoofing a RST packet

  26. Network Environment

  27. Tcpkill- Jei kill Roy 躲在牆後面- (偷笑中…) 怎麼了？ 怎麼了？嗚嗚… 暗自竊喜… 看我的... 哇哈哈哈.. 為民除害 Mike: 接好!! 最高機密!! Jei: 又排擠我！ 搞破壞!! Roy: 小心隔牆有耳!! Attacker ftp.ccu.edu.tw Victim1 Attacker

  28. Tcpnice • Slow down the connection speed • Change the window size 1 Win 160 Win 8 20

  29. Network Environment

  30. Tcpnice • Tcpnice enable • After a moment… Slower… 1 MB->464kB Normal speed No any tcpnice

  31. Urlsnarf • Grab any URLs from HTTP traffic

  32. Network Environment

  33. Urlsnarf

  34. Webspy • Sniff the victim’s web traffic and connect to

  35. Network Environment

  36. Webspy- interact with you • Need netscape

  37. 特別鳴謝 ---友情客串--- Mike 莊明霓飾 Jei 廖威捷飾 ---場地--- insafs.comm.ccu.edu.tw bbs.ccu.edu.tw insa test-bed 140.123.113.77 ---道具--- INSA Lab. ---特別贊助--- Microsoft IBM Netscreen . . (太多了 由衷感謝) ---執行製作--- Roy ---導演--- Roy =THE END=

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