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ICMP stands for Internet Control Message Protocol and is the most used protocol in networking technology. A connectionless protocol, ICMP does not use any port number and works in the network layer. ICMP is commonly used for diagnostic purposes, error reporting or querying any server, and right now attackers are using ICMP to send payloads, which we will discuss here. The popular ping command will use ICMP.
The ICMP Echo protocol (usually known as Ping) is mostly harmless. Its main security-related issues are: In the presence of requests with a fake source address (spoofing), they can make a target machine send relatively large packets to another host.CMPTX uses the ICMP echo and ICMP reply. ICMP echo is not always harmless, since it contains a data component, it can be exfiltrating data or being used as a control channel, or being used (in the case of ICMPTX) as a tunneling protocol.