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

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# 기본 정보
이 호스트에서 에코 서비스가 실행되고 있습니다. 에코 서비스는 테스트 및 측정 목적으로 설계되었으며 TCP 및 UDP 프로토콜 모두에서 수신 대기할 수 있습니다. 서버는 수신한 데이터를 수정 없이 그대로 반환합니다.\
**동일한 또는 다른 머신의 에코 서비스에 연결하여 서비스 거부를 유발할 수 있습니다**. 생성된 패킷의 수가 지나치게 많기 때문에 영향을 받는 머신은 효과적으로 서비스에서 제외될 수 있습니다.\
정보 출처: [https://www.acunetix.com/vulnerabilities/web/echo-service-running/](https://www.acunetix.com/vulnerabilities/web/echo-service-running/)
**기본 포트:** 7/tcp/udp
```
PORT STATE SERVICE
7/udp open echo
7/tcp open echo
```
## Contact Echo 서비스 (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 포트 서비스 거부 공격](http://www.cert.org/advisories/CA-1996-01.html)
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