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Category: 312-50v8

Exam 312-50v8: Certified Ethical Hacker (v8)

What attacks can you successfully launch against a server using the above technique?

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?

What kind of software could Harold use to accomplish this?

Harold just got home from working at Henderson LLC where he works as an IT technician. He was
able to get off early because they were not too busy. When he walks into his home office, he
notices his teenage daughter on the computer, apparently chatting with someone online. As soon
as she hears Harold enter the room, she closes all her windows and tries to act like she was
playing a game. When Harold asks her what she was doing, she acts very nervous and does not
give him a straight answer. Harold is very concerned because he does not want his daughter to
fall victim to online predators and the sort. Harold doesn’t necessarily want to install any programs
that will restrict the sites his daughter goes to, because he doesn’t want to alert her to his trying to
figure out what she is doing. Harold wants to use some kind of program that will track her activities
online, and send Harold an email of her activity once a day so he can see what she has been up
to. What kind of software could Harold use to accomplish this?


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