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EC-Council

312-50V7 · Question #113

312-50V7 Question #113: Real Exam Question with Answer & Explanation

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Question

After a client sends a connection request (SYN) packet to the server, the server will respond (SYN- ACK) with a sequence number of its choosing, which then must be acknowledged (ACK) by the client. This sequence number is predictable; the attack connects to a service first with its own IP address, records the sequence number chosen, and then opens a second connection from a forged IP address. The attack doesn't see the SYN-ACK (or any other packet) from the server, but can guess the correct responses. If the source IP address is used for authentication, then the attacker can use the one-sided communication to break into the server. What attacks can you successfully launch against a server using the above technique?

Options

  • ADenial of Service attacks
  • BSession Hijacking attacks
  • CWeb page defacement attacks
  • DIP spoofing attacks

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