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

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# Informazioni di base

Un servizio di echo è in esecuzione su questo host. Il servizio di echo era destinato a scopi di test e misurazione e può ascoltare sia i protocolli TCP che UDP. Il server restituisce qualsiasi dato riceve, senza alcuna modifica.\
**È possibile causare un'interruzione del servizio collegando un servizio di echo a un servizio di echo sulla stessa o su un'altra macchina**. A causa dell'eccessivo numero di pacchetti prodotti, le macchine interessate possono essere effettivamente messe fuori servizio.\
Info da [https://www.acunetix.com/vulnerabilities/web/echo-service-running/](https://www.acunetix.com/vulnerabilities/web/echo-service-running/)

**Porta predefinita:** 7/tcp/udp
```
PORT   STATE SERVICE
7/udp  open  echo
7/tcp  open  echo
```
## Contattare il servizio Echo (UDP)
```bash
nc -uvn <IP> 7
Hello echo    #This is wat you send
Hello echo    #This is the response
```
## Shodan

* `port:7 echo`

## Riferimenti

[Wikipedia echo](http://en.wikipedia.org/wiki/ECHO\_protocol)

[CA-1996-01 Attacco Denial-of-Service su Porta UDP](http://www.cert.org/advisories/CA-1996-01.html)


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