If the receiving interface is enabled, the receiver replies with an SYN | ACK If the receiving port is disabled, the receiver replies with an RST | ACK message. A device undergoing a Christmas tree attack may break down.Īn attacker sends a TCP packet in which the SYN and FIN are 1 to a target host. If the six flag bits are all 1s, the attack is a Christmas tree attack. Different systems respond differently to the combination of Attacks from Packets with Invalid TCP Flag BitsĪ TCP packet contains six flag bits: URG, ACK, PSH, RST, SYN, and FIN.
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