Network Security Threats

• Generic Description of Threats
  • Impersonating a User or System
  • Eavesdropping
  • Denial of Service
  • Packet Replay
  • Packet Modification
• Threats Associated With Common Network Access Procedures
  • Telnet
  • File Transfer Protocol
  • Trivial File Transfer Protocol
  • Mail
  • Unix-to-Unix Copy System
  • rlogin, rsh, and rcp
  • Commands Revealing User Information
    • finger
    • rexec
    • rwho, rusers, netstat, and systat
  • Distributed File Systems
    • Network File System (NFS) Threats
    • File Permissions
    • Remote File Sharing (RFS)
  • Network Information Service