In a LAND attack, a hacker sends to the target computer a packet that has the identical source and destination ip address as that of the target computer.
A LAND Attack is a Layer 4 Denial of Service (DoS) attack in which, the attacker sets the source and destination information of a TCP segment to be the same. A vulnerable machine will crash or freeze due to the packet being repeatedly processed by the TCP stack.
In a LAND attack, a specially crafted TCP SYN packet is created such that the source IP address and port are set to be the same as the destination address and port, which in turn is set to point to an open port on a victim’s machine.
A vulnerable machine would receive such a message and reply to the destination address effectively sending the packet for reprocessing in an infinite loop. Thus, machine CPU is consumed indefinitely freezing the vulnerable machine, causing a lock up, or even crashing it.
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