¨Small modular programs to check for a specific vulnerability
¨Categories of plug-ins
–Finger abuses
–Windows
–Backdoors
–Gain a shell remotely
–CGI abuses
–General
–Remote file access
–RPC
–Firewalls
–FTP
–SMTP problems
–Useless services
–Gain root remotely
–NIS
–Denial-of-Service
–Miscellaneous
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