node.js任意文件读取测试

漏洞影响：

Node.js 8.5.0 + Express 3.19.0-3.21.2
Node.js 8.5.0 + Express 4.11.0-4.15.5

具体参考下面的拓展：

参考：

https://www.jb51.net/article/127896.htm

https://security.tencent.com/index.php/blog/msg/121

https://www.jianshu.com/p/50e5090028f4