Non-blind IP spoofing works when the attacker is on the same subnet as the victim and can directly see the sequence numbers of other connections, for example, between the victim and their internet gateway router. TCP sequence prediction (non-blind IP spoofing) For example, if device A declared the starting sequence number to be 74656, the next packet from device A to device B must have sequence number 74657, and so on. The sequence numbers allow devices to determine the order of subsequent data packets. The SYN requests declare random starting sequence numbers (a different one for each direction), needed for the recipient to recognize further packets. Device A sends an ACK message (acknowledgment of the received SYN) to device B.Device B sends a SYN-ACK message (synchronization request + acknowledgment of the received SYN) to device A.Device A sends a SYN message (synchronization request) to device B.The connection process is called a three-way handshake. When two devices on the network connect using TCP/IP, they first need to establish a TCP connection. Most computer network connections are established using TCP/IP (Transmission Control Protocol/Internet Protocol). Before looking at these types of spoofing, we need a side note to explain how TCP sequence numbers work. To ensure they have the upper hand, attackers can use two techniques, both based on manipulating TCP sequence numbers. In all these cases, the attack will be unsuccessful, and the victim may notice the failed attempt. The original device may disconnect, the connection may be unsuccessful, or both devices may connect and then disconnect. However, if the attacker simply declares the same IP as the victim, they will cause a network conflict with unpredictable results. You might think that IP spoofing is easy to do since any device can declare its own IP.
Note: IP spoofing is a network security problem, not a web application security issue, but it can have a major impact on the security of web servers and web applications. This technique is used in man-in-the-middle attacks (MITM attacks) and DoS attacks (denial-of-service attacks). IP address spoofing ( IP spoofing) is a type of cyberattack where an attacker sends IP packets with a modified source IP address.
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