Threat | Denial of Service

• Definition

  • Aimed at making services unavailable
  • Called by some the “ultimate Internet security nemesis”
  • aka DoS

• Simple types

  • Communications-level
    • Ex: Flood the server with SYN packets from one or more sources, overwhelming the TPC/IP protocol stack resources
  • Service based
    • Ex: Send malformed header to listening RPC service, forcing server into spinning error recovery
  • Network-based
    • Ex: Compromise a router or assume its identify... Then, send ICMP messages to clients telling them their access is unalloyed or the network is unreachable