hacktricks/network-services-pentesting/7-tcp-udp-pentesting-echo.md

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Basic Information

'ej echo service host running. echo service testing measurement purposes intended The TCP UDP protocols both listen may. server receives data back sends, modification no.
It's possible to cause a denial of service by connecting the a echo service to the echo service on the same or another machine. Because of the excessively high number of packets produced, the affected machines may be effectively taken out of service.
Info from https://www.acunetix.com/vulnerabilities/web/echo-service-running/

Default Port: 7/tcp/udp

PORT   STATE SERVICE
7/udp  open  echo
7/tcp  open  echo

Qa'vIn Echo tIq (UDP)

The Echo service is a simple network service that allows a client to send a message to a server, which then echoes the message back to the client. This service is commonly used for testing and troubleshooting network connectivity.

To contact the Echo service using UDP, you can use the nc command (also known as netcat) in Linux or the ncat command in Windows. Here's an example of how to do it:

nc -u <server_ip> <port>

Replace <server_ip> with the IP address of the server running the Echo service, and <port> with the port number on which the service is listening (usually port 7).

Once the connection is established, you can type a message and press Enter to send it to the server. The server will then echo the message back to you.

Remember that UDP is a connectionless protocol, so there is no guarantee that the message will reach the server or that the server's response will reach you. However, the Echo service is designed to be simple and reliable, so you should be able to test UDP connectivity using this method.

Note: If you encounter any issues or errors while contacting the Echo service, make sure that the server is running and that there are no firewall rules blocking the UDP traffic on the specified port.

nc -uvn <IP> 7
Hello echo    #This is wat you send
Hello echo    #This is the response

Shodan

• port:7 echo

References

Wikipedia echo

CA-1996-01 UDP Port Denial-of-Service Attack

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