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ゼットスケーラーのセキュリティアドバイザリ

セキュリティ アドバイザリー - 10月 12, 2021

Zscaler protects against 6 new vulnerabilities for Microsoft Windows

  1. Overview
  2. CVE-2021-41357 – Win32k elevation of Privilege Vulnerability
  3. CVE-2021-40487 – Microsoft SharePoint Server Remote Code Execution Vulnerability
  4. CVE-2021-40450 – Win32k Elevation of Privilege Vulnerability
  5. CVE-2021-40467 – Windows Common Log File System Driver Elevation of Privilege Vulnerability
  6. CVE-2021-40470 – DirectX Graphics Kernel Elevation of Privilege Vulnerability
  7. CVE-2021-40449 – Win32k Elevation of Privilege Vulnerability

Zscaler, working with Microsoft through their MAPP program, has proactively deployed protection for the following 6 vulnerabilities included in the October 2021 Microsoft security bulletins. Zscaler will continue to monitor exploits associated with all vulnerabilities in the October release and deploy additional protections, as necessary.

CVE-2021-41357 – Win32k elevation of Privilege Vulnerability

Severity: Important

Affected Software

  • Windows 11 for ARM64based Systems
  • Windows 11 for x64based Systems
  • Windows Server, version 20H2 (Server Core Installation)
  • Windows 10 Version 20H2 for ARM64based Systems
  • Windows 10 Version 20H2 for 32bit Systems
  • Windows 10 Version 20H2 for x64based Systems
  • Windows Server, version 2004 (Server Core installation)
  • Windows 10 Version 2004 for x64based Systems
  • Windows 10 Version 2004 for ARM64based Systems
  • Windows 10 Version 2004 for 32bit Systems
  • Windows Server 2022 (Server Core installation)
  • Windows Server 2022
  • Windows 10 Version 21H1 for 32bit Systems
  • Windows 10 Version 21H1 for ARM64based Systems
  • Windows 10 Version 21H1 for x64based Systems

CVE-2021-40487 – Microsoft SharePoint Server Remote Code Execution Vulnerability.

Severity: Important

Affected Software

  • Microsoft SharePoint Foundation 2013 Service Pack 1
  • Microsoft SharePoint Server 2019
  • Microsoft SharePoint Enterprise Server 2016

CVE-2021-40450 – Win32k Elevation of Privilege Vulnerability.

Severity: Important

Affected Software

  • Windows 11 for ARM64based Systems
  • Windows 11 for x64based Systems
  • Windows Server, version 20H2 (Server Core Installation)
  • Windows 10 Version 20H2 for ARM64based Systems
  • Windows 10 Version 20H2 for 32bit Systems
  • Windows 10 Version 20H2 for x64based Systems
  • Windows Server, version 2004 (Server Core installation)
  • Windows 10 Version 2004 for x64based Systems
  • Windows 10 Version 2004 for ARM64based Systems
  • Windows 10 Version 2004 for 32bit Systems
  • Windows Server 2022 (Server Core installation)
  • Windows Server 2022
  • Windows 10 Version 21H1 for 32bit Systems
  • Windows 10 Version 21H1 for ARM64based Systems
  • Windows 10 Version 21H1 for x64based Systems
  • Windows 10 Version 1909 for ARM64based Systems
  • Windows 10 Version 1909 for x64based Systems
  • Windows 10 Version 1909 for 32bit Systems
  • Windows Server 2019 (Server Core installation)
  • Windows Server 2019
  • Windows 10 Version 1809 for ARM64based Systems
  • Windows 10 Version 1809 for x64based Systems
  • Windows 10 Version 1809 for 32bit Systems

CVE-2021-40467 – Windows Common Log File System Driver Elevation of Privilege Vulnerability.

Severity: Important

Affected Software

  • 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 x64based Systems Service Pack 1 (Server Core installation)
  • Windows Server 2008 R2 for x64based Systems Service Pack 1
  • Windows Server 2008 for x64based Systems Service Pack 2 (Server Core installation)
  • Windows Server 2008 for x64based Systems Service Pack 2
  • Windows Server 2008 for 32bit Systems Service Pack 2 (Server Core installation)
  • Windows Server 2008 for 32bit Systems Service Pack 2
  • Windows RT 8.1
  • Windows 8.1 for x64based systems
  • Windows 8.1 for 32bit systems
  • Windows 7 for x64based Systems Service Pack 1
  • Windows 7 for 32bit Systems Service Pack 1
  • Windows Server 2016 (Server Core installation)
  • Windows Server 2016
  • Windows 10 Version 1607 for x64based Systems
  • Windows 10 Version 1607 for 32bit Systems
  • Windows 10 for x64based Systems
  • Windows 10 for 32bit Systems
  • Windows 11 for ARM64based Systems
  • Windows 11 for x64based Systems
  • Windows Server, version 20H2 (Server Core Installation)
  • Windows 10 Version 20H2 for ARM64based Systems
  • Windows 10 Version 20H2 for 32bit Systems
  • Windows 10 Version 20H2 for x64based Systems
  • Windows Server, version 2004 (Server Core installation)
  • Windows 10 Version 2004 for x64based Systems
  • Windows 10 Version 2004 for ARM64based Systems
  • Windows 10 Version 2004 for 32bit Systems
  • Windows Server 2022 (Server Core installation)
  • Windows Server 2022
  • Windows 10 Version 21H1 for 32bit Systems
  • Windows 10 Version 21H1 for ARM64based Systems
  • Windows 10 Version 21H1 for x64based Systems
  • Windows 10 Version 1909 for ARM64based Systems
  • Windows 10 Version 1909 for x64based Systems
  • Windows 10 Version 1909 for 32bit Systems
  • Windows Server 2019 (Server Core installation)
  • Windows Server 2019
  • Windows 10 Version 1809 for ARM64based Systems
  • Windows 10 Version 1809 for x64based Systems
  • Windows 10 Version 1809 for 32bit Systems

CVE-2021-40470 – DirectX Graphics Kernel Elevation of Privilege Vulnerability

Severity: Important

Affected Software

  • Windows Server 2016 (Server Core installation)
  • Windows Server 2016
  • Windows 10 Version 1607 for x64based Systems
  • Windows 10 Version 1607 for 32bit Systems
  • Windows 10 for x64based Systems
  • Windows 10 for 32bit Systems
  • Windows 11 for ARM64based Systems
  • Windows 11 for x64based Systems
  • Windows Server, version 20H2 (Server Core Installation)
  • Windows 10 Version 20H2 for ARM64based Systems
  • Windows 10 Version 20H2 for 32bit Systems
  • Windows 10 Version 20H2 for x64based Systems
  • Windows Server, version 2004 (Server Core installation)
  • Windows 10 Version 2004 for x64based Systems
  • Windows 10 Version 2004 for ARM64based Systems
  • Windows 10 Version 2004 for 32bit Systems
  • Windows Server 2022 (Server Core installation)
  • Windows Server 2022
  • Windows 10 Version 21H1 for 32bit Systems
  • Windows 10 Version 21H1 for ARM64based Systems
  • Windows 10 Version 21H1 for x64based Systems
  • Windows 10 Version 1909 for ARM64based Systems
  • Windows 10 Version 1909 for x64based Systems
  • Windows 10 Version 1909 for 32bit Systems
  • Windows Server 2019 (Server Core installation)
  • Windows Server 2019
  • Windows 10 Version 1809 for ARM64based Systems
  • Windows 10 Version 1809 for x64based Systems
  • Windows 10 Version 1809 for 32bit System

CVE-2021-40449 – Win32k Elevation of Privilege Vulnerability.

Severity: Important

Affected Software

  • 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 x64based Systems Service Pack 1 (Server Core installation)
  • Windows Server 2008 R2 for x64based Systems Service Pack 1
  • Windows Server 2008 for x64based Systems Service Pack 2 (Server Core installation)
  • Windows Server 2008 for x64based Systems Service Pack 2
  • Windows Server 2008 for 32bit Systems Service Pack 2 (Server Core installation)
  • Windows Server 2008 for 32bit Systems Service Pack 2
  • Windows RT 8.1
  • Windows 8.1 for x64based systems
  • Windows 8.1 for 32bit systems
  • Windows 7 for x64based Systems Service Pack 1
  • Windows 7 for 32bit Systems Service Pack 1
  • Windows Server 2016 (Server Core installation)
  • Windows Server 2016
  • Windows 10 Version 1607 for x64based Systems
  • Windows 10 Version 1607 for 32bit Systems
  • Windows 10 for x64based Systems
  • Windows 10 for 32bit Systems
  • Windows 11 for ARM64based Systems
  • Windows 11 for x64based Systems
  • Windows Server, version 20H2 (Server Core Installation)
  • Windows 10 Version 20H2 for ARM64based Systems
  • Windows 10 Version 20H2 for 32bit Systems
  • Windows 10 Version 20H2 for x64based Systems
  • Windows Server, version 2004 (Server Core installation)
  • Windows 10 Version 2004 for x64based Systems
  • Windows 10 Version 2004 for ARM64based Systems
  • Windows 10 Version 2004 for 32bit Systems
  • Windows Server 2022 (Server Core installation)
  • Windows Server 2022
  • Windows 10 Version 21H1 for 32bit Systems
  • Windows 10 Version 21H1 for ARM64based Systems
  • Windows 10 Version 21H1 for x64based Systems
  • Windows 10 Version 1909 for ARM64based Systems
  • Windows 10 Version 1909 for x64based Systems
  • Windows 10 Version 1909 for 32bit Systems
  • Windows Server 2019 (Server Core installation)
  • Windows Server 2019
  • Windows 10 Version 1809 for ARM64based Systems
  • Windows 10 Version 1809 for x64based Systems
  • Windows 10 Version 1809 for 32bit Systems