Denial-of-service attack

Denial-of-service attack: Flooding systems or servers with traffic to exhaust resources and bandwidth.

• Volume-based attacks:

  • UDP flood

    A UDP flood is a form of volumetric DoS attack where the attacker targets and overwhelms random ports on the host with UDP packets.

    Link to original

  • ICMP flood

    ICMP flood is a flood of ping requests. (ICMP echo request packets)

    Link to original

• Application attacks:

  • HTTP flood

    A HTTP flood is a Layer-7 application attack that uses botnets, attacker spams HTTP requests to host.

    Link to original

  • Slow Loris

    Slow Loris sends small portions of a HTTP request to a server. These are sent in timed intervals so the request does not time out, the server runs out of available connections.

    Link to original

• Protocol attacks:

  • TCP SYN flood

    TCP SYN flood is where an attacker sends seemingly normal SYN requests to a server which cause it to respond with SYN-ACK packets. This causes the target machine to slowly run out of memory as it waits for ACK packets from the attacker.

    Link to original

  • Ping of Death

    A Ping of Death is where an attacker tries to crash or freeze a server by sending a normal ping request that is either fragmented or oversized.

    Link to original