Ph. D prepared by : mohammad nassar



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Sana21.10.2022
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DoS

INTERNET INSECURITY

  • 􀂾 Morris worm of 1987
  • 􀂾 Password sniffing attacks in 1994
  • 􀂾 IP spoofing attacks in 1995
  • 􀂾 Denial of service attacks in 1996
  • 􀂾 Email borne viruses 1999
  • 􀂾 Distributed denial of service attacks 2000
  • 􀂾 Fast spreading worms and viruses 2003
  • 􀂾 Spam 2004
  • 􀂾 … no end in sight
  • 􀂙 Internet insecurity grows at super-Internet speed
  • 􀂾 security incidents are growing faster than the Internet (which has
  • roughly doubled every year since 1988)
  • Costs of DoS attacks for victim organizations
  • • Denial of Service is currently the most expensive computer crime for victim organizations:
  • Classification of DoS attacks
  • 1. Bandwidth consumption:
  • Attacks will consume all available network bandwidth
  • 2. Resource starvation:
  • Attacks will consume system resources (mainly CPU, memory, storage space)
  • 3. Programming flaws:
  • Failures of applications or OS components to handle exceptional conditions (i.e. unexpected data is sent to a vulnerable component). 4. Routing and DNS attacks:
    • manipulate routing tables.
    • changing routing tables to route to attacker’s net or black hole.
    • attack to DNS servers, again route to attackers or black hole.

examples

  • Smurf
    • 1. Attacker sends sustained ICMP (availability of host) Echo packets (ping) to broadcast address of the amplifying network, with source address is forged.
    • 2. Since traffic was sent to broadcast address all hosts in the amplifying LAN will answer to the victim’s IP address.
  • Ping of death???

Ping (win XP)

  • C:\>ping 64.233.183.103 with 32 bytes of data (yahoo)
  • Reply from 64.233.183.103: bytes=32 time=25ms TTL=245
  • Reply from 64.233.183.103: bytes=32 time=22ms TTL=245
  • Reply from 64.233.183.103: bytes=32 time=25ms TTL=246
  • Reply from 64.233.183.103: bytes=32 time=22ms TTL=246
  • Ping statistics for 64.233.183.103: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

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