> 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/information-disclosure/authentication-bypass-via-information-disclosure.md).
# 通过信息泄露绕过身份验证
### 通过信息泄露绕过身份验证
该应用的管理界面包含一个身份验证绕过机制。它基于前端使用的一个自定义 HTTP 头，但事先未知。/ 要完成该实验，你需要识别该头的名称，利用它绕过身份验证，访问管理界面并删除用户 **carlos**.
**初始访问管理界面**
尝试直接通过以下方式访问管理页面 `/admin` 路由会返回以下消息：
> *管理界面仅对本地用户开放*
这表明访问仅限于来自本地主机的请求。
**通过 TRACE 方法泄露信息**
通过发送一个使用 `TRACE` 方法向 `/admin`发送 HTTP 请求，服务器会返回比需要更多的头部。
```bash
TRACE /admin
```
在这些信息中，泄露了一个自定义头：
```bash
X-Custom-Ip-Authorization
```
前端使用该头来判断请求是否来自本地用户。
**绕过身份验证**
在请求中添加以下头： `/admin`:
```bash
X-Custom-Ip-Authorization: 127.0.0.1
```
服务器会将该请求视为本地请求。/ 之后即可无需额外身份验证访问管理界面。
**最终利用**
连接到管理面板后，可以通过访问以下 URL 删除目标用户：
```bash
/admin/delete?username=carlos
```
---
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