微软紧急发布Type 1字体解析远程代码执行漏洞通告-安全客

报告编号：B6-2020-032401

报告来源：360-CERT

报告作者：360-CERT

更新日期：2020-03-23

0x01 漏洞背景

近日，360-CERT监测到微软公司发布了一份编号ADV200006 的紧急漏洞通告，通告表示有在野攻击行动使用了位于Adobe Type Manager Library中的两个远程代码执行0Day漏洞，由于漏洞严重发布该通告指导用户在补丁发布前规避风险。

据悉，这两个远程代码执行漏洞的原因主要是Windows Adobe Type Manager Library并没有正确处理特殊构造的多重母版字体——Adobe Type1 PostScript格式，漏洞评估严重，已停止服务的WIN7也受到漏洞影响。

攻击者可通过多种场景实施攻击，比如说服受害者在Windows的预览中访问一个特殊构造的文档。

目前微软正在准备漏洞相关的补丁，预计下个月的补丁日会发布，暂时只提供缓解方式。

360-CERT建议用户关注微软对于该漏洞的修复进展，紧急用户可先参考对应的缓解方案。

0x02 受影响版本

微软已对该漏洞的影响范围进行修订

Windows10 1709以后，不再存在受影响的 ATMFD.DLL(1703存在但不再使用)。同时该漏洞攻击成功只能在权限和功能受限的AppContainer沙箱上下文中执行代码。

Windows 10 for 32-bit Systems
Windows 10 for x64-based Systems Windows 10 Version 1607 for 32-bit Systems
Windows 10 Version 1607 for x64-based Systems
Windows 10 Version 1709 for 32-bit Systems
Windows 10 Version 1709 for ARM64-based Systems
Windows 10 Version 1709 for x64-based Systems
Windows 10 Version 1803 for 32-bit Systems
Windows 10 Version 1803 for ARM64-based Systems
Windows 10 Version 1803 for x64-based Systems
Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for ARM64-based Systems
Windows 10 Version 1809 for x64-based Systems
Windows 10 Version 1903 for 32-bit Systems
Windows 10 Version 1903 for ARM64-based Systems
Windows 10 Version 1903 for x64-based Systems
Windows 10 Version 1909 for 32-bit Systems
Windows 10 Version 1909 for ARM64-based Systems
Windows 10 Version 1909 for x64-based Systems
Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems Service Pack 1
Windows 8.1 for 32-bit systems
Windows 8.1 for x64-based systems
Windows RT 8.1
Windows Server 2008 for 32-bit Systems Service Pack 2
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
Windows Server 2008 for Itanium-Based Systems Service Pack 2
Windows Server 2008 for x64-based Systems Service Pack 2
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
Windows Server 2012
Windows Server 2012 (Server Core installation)
Windows Server 2012 R2
Windows Server 2012 R2 (Server Core installation)
Windows Server 2016
Windows Server 2016 (Server Core installation)
Windows Server 2019
Windows Server 2019 (Server Core installation)
Windows Server, version 1803 (Server Core Installation)
Windows Server, version 1903 (Server Core installation)
Windows Server, version 1909 (Server Core installation)

0x03 缓解建议

微软在通告中提供了多种选择，用户可以自行选择（具体见参考链接），此处主要建议重命名ATMFD.DLL文件的方式（同时建议用户安装360安全卫士进行主动防御）。

32位操作系统缓解方式：

在管理员权限的命令行里输入

cd "%windir%\system32"
takeown.exe /f atmfd.dll
icacls.exe atmfd.dll /save atmfd.dll.acl
icacls.exe atmfd.dll /grant Administrators:(F) 
rename atmfd.dll x-atmfd.dll

重启系统

64位操作系统缓解方式：

在管理员权限的命令行里输入

cd "%windir%\system32"
takeown.exe /f atmfd.dll
icacls.exe atmfd.dll /save atmfd.dll.acl
icacls.exe atmfd.dll /grant Administrators:(F) 
rename atmfd.dll x-atmfd.dll
cd "%windir%\syswow64"
takeown.exe /f atmfd.dll
icacls.exe atmfd.dll /save atmfd.dll.acl
icacls.exe atmfd.dll /grant Administrators:(F) 
rename atmfd.dll x-atmfd.dll