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32 lines
1.1 KiB
Markdown
32 lines
1.1 KiB
Markdown
{{#include ../banners/hacktricks-training.md}}
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# 基本信息
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此主机上运行着一个回显服务。回显服务旨在用于测试和测量目的，可能同时监听 TCP 和 UDP 协议。服务器会将收到的任何数据原样发送回去。\
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**通过将回显服务连接到同一台或另一台机器上的回显服务，可以导致服务拒绝。** 由于产生的包数量过多，受影响的机器可能会被有效地使其无法服务。\
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信息来自 [https://www.acunetix.com/vulnerabilities/web/echo-service-running/](https://www.acunetix.com/vulnerabilities/web/echo-service-running/)
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**默认端口：** 7/tcp/udp
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```
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PORT STATE SERVICE
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7/udp open echo
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7/tcp open echo
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```
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## 联系回显服务 (UDP)
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```bash
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nc -uvn <IP> 7
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Hello echo #This is wat you send
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Hello echo #This is the response
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```
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## Shodan
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- `port:7 echo`
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## References
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[Wikipedia echo](http://en.wikipedia.org/wiki/ECHO_protocol)
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[CA-1996-01 UDP Port Denial-of-Service Attack](http://www.cert.org/advisories/CA-1996-01.html)
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{{#include ../banners/hacktricks-training.md}}
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