Typical Scenario

• gain access to an account

  • default or ease to guess passwords; social engineering
  • exploit a vulnerabilities in an operating systems - Unix services are particularly vulnerable (sendmail /IMAP/POP, NFS, NIS, DNS/BIND, FTP, TFTP, SYSLOG)

• use "crack" to break more user passwords

• obtain superuser privileges

• install "back doors" (Trojan Horses)

• install sniffers (packet and password grabbers) to obtain more password and site information

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