Basic HTML version of Foils prepared May 19 99

Foil 25 Port Scanners (5)

From Computer Crimes: Examples of Network Security attacks Tango Group Internal Technology Seminars -- April 23 99. by Roman Markowski
1 NMAP - FTP bounce
  • we can tell an anonymous ftp server to connect to machines inside its firewall
  • ping 20.10.1.17 (host behind a firewall)
    • ICMP Host Unreachable
  • ping 128.70.21.256
    • 128.70.21.256 is alive
  • nmap -ports 20-32 anonymous:foobar@128.70.21.256 20.10.1.17
    • connection to ftp://anonymous:foobar@128.70.21.256:21
    • TCP ftp bounce scan against 20.10.1.17
    • list of ports, protocols, services
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