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Basic Information
An echo service is running on this host. The echo service was intended for testing and measurement purposes and may listen on both TCP and UDP protocols. The server sends back any data it receives, with no modification.
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
Contact Echo service (UDP)
nc -uvn <IP> 7
Hello echo #This is wat you send
Hello echo #This is the response
Shodan
port:7 echo
References
CA-1996-01 UDP Port Denial-of-Service Attack
Support HackTricks and get benefits!
Do you work in a cybersecurity company? Do you want to see your company advertised in HackTricks? or do you want to have access the latest version of the PEASS or download HackTricks in PDF? Check the SUBSCRIPTION PLANS!
Discover The PEASS Family, our collection of exclusive NFTs
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Share your hacking tricks submitting PRs to the hacktricks github repo.