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Attackers might want to spoof, or mimic, legitimate TCP/IP packet to attack a computer or network. Usually, spoofing a packet requires that the attacker handcraft a TCP/IP packet and send it to either the host she wants to attack or a third-party host that she has previously

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compromised to attack the targeted host or network. Many types of spoofing attacks exist. These following three are among the most well known:



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One final point about SONET should be made When the standard is deployed over ring topologies, two timing techniques are used Either external timing sources are depended upon to time network elements, or one device on the ring is internally timed (free running) while all the others are through-timed

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Land attack Takes advantage of security flaws in the many implementations of TCP/IP. To carry out a land attack, an attacker opens a legitimate TCP session by sending a SYN packet but spoofs the packet so that the source address and port and the destination address and port match the host IP address and the port the packet is being sent to.





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For example, to carry out a land attack on an e-mail server with the IP address 192.168.183.200, an attacker can create a packet with the source address of 192.168.183.200 and the source port of 25, rather than using the source address and port of his own computer. Now the source and destination addresses will be the same, as will the source and destination ports. If not patched to protect against the land attack, the packet will continually attempt to make a connection with itself on its own port 25, resulting in a denial-of-service situation.

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Uses a third-party network to carry out a denial-of-service attack on a host system by spoofing an ICMP Echo Request packet. The attacker obtains the host IP address and creates a forged ICMP Echo Request packet that looks like it came from the host IP address. The attacker sends thousands of copies of the spoofed packet to the broadcast address on an improperly secured third-party network. This results in every computer in the third-party network responding to each spoofed packet by sending an ICMP Echo Reply packet to the host system. The amount of ICMP traffic that is generated by this attack will deny legitimate traffic from reaching the target host.

Smurf attack Session hijacking Takes advantage of flaws in many implementations of the TCP/IP protocol by anticipating TCP sequence numbers to hijack a session with a host. To hijack a TCP/IP session, the attacker creates a legitimate TCP session to the targeted host, records the TCP sequence numbers used by the host, and then computes the round-trip time (RTT). This step often takes many exchanges in sequence. Using the stored sequence numbers and the RTT, the attacker can potentially predict future TCP sequence numbers. The attacker can then send a spoofed packet to another host, using the targeted host IP address as the source address and the next sequence number. If successful, the second host system will believe the packet originated from the targeted system and accept packets from the attacker. This type of attack is particularly effective when the second host trusts the targeted host.

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IP spoofing by predicting TCP/IP sequence numbers was the basis for the famous Christmas 1994 attack on Tsutomu Shimomura by Kevin Mitnick. The attack is chronicled in the book Takedown: The Pursuit and Capture of Kevin Mitnick, America s Most Wanted Computer Outlaw By the Man Who Did It (Hyperion, 1996).

Denial-of-service attackers attempt to exploit the way the TCP/IP protocol works to prevent legitimate traffic from reaching the host system. One of the most common types of denial-ofservice attacks is a SYN flood. A SYN flood attempts to create a situation in which the host

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