System & Network Threats Security

• Worms - use spawn mechanism; standalone program
• Internet worm

 - Exploited UNIX networking features (remote access) and bugs in finger and send-mail programs. (See next slide)

          - Grappling hook program uploaded main worm program

• Port scanning

          - Automated attempt to connect to a range of ports on one or a range of IP addresses

• Denial of Service

           - Overloaded the targeted computer preventing it from doing any useful work.
           - Distributed denial-of-service (DDOS) come from multiple sites at once.