Port Scanners (5)

• 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

Previous slide

Next slide

Back to first slide

View graphic version