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

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# Osnovne informacije
Na ovom hostu radi echo servis. Echo servis je namenjen za testiranje i merenje i može slušati na TCP i UDP protokolima. Server vraća sve podatke koje primi, bez modifikacije.\
**Moguće je izazvati uskraćivanje usluge povezivanjem echo servisa sa echo servisom na istom ili drugom računaru**. Zbog prekomerno velikog broja paketa koji se proizvode, pogođeni računari mogu biti efikasno isključeni iz usluge.\
Informacije sa [https://www.acunetix.com/vulnerabilities/web/echo-service-running/](https://www.acunetix.com/vulnerabilities/web/echo-service-running/)
**Podrazumevani port:** 7/tcp/udp
```
PORT STATE SERVICE
7/udp open echo
7/tcp open echo
```
## Kontaktiranje Echo servisa (UDP)
```bash
nc -uvn <IP> 7
Hello echo #This is wat you send
Hello echo #This is the response
```
## Shodan
* `port:7 echo`
## References
[Wikipedia echo](http://en.wikipedia.org/wiki/ECHO\_protocol)
[CA-1996-01 UDP Port Denial-of-Service Attack](http://www.cert.org/advisories/CA-1996-01.html)
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