Zscaler, working with Microsoft through their MAPP program, has proactively deployed protection for the following 2 vulnerabilities included in the February 2023 Microsoft security bulletins. Zscaler will continue to monitor exploits associated with all vulnerabilities in the February release and deploy additional protections, as necessary.

CVE-2023-23376 – 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 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 10 Version 22H2 for 32bit Systems
Windows 10 Version 22H2 for ARM64based Systems
Windows 10 Version 22H2 for x64based Systems
Windows 11 Version 22H2 for x64based Systems
Windows 11 Version 22H2 for ARM64based Systems
Windows 10 Version 21H2 for x64based Systems
Windows 10 Version 21H2 for ARM64based Systems
Windows 10 Version 21H2 for 32bit Systems
Windows 11 version 21H2 for ARM64based Systems
Windows 11 version 21H2 for x64based Systems
Windows 10 Version 20H2 for ARM64based Systems
Windows 10 Version 20H2 for 32bit Systems
Windows 10 Version 20H2 for x64based Systems
Windows Server 2022 (Server Core installation)
Windows Server 2022
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-2023-21823 – Windows Graphics Component Remote Code Execution Vulnerability

Severity: Important

Affected Software

Windows Microsoft Office for Android
Microsoft Office for iOS
Microsoft Office for Universal
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 1809 for 32-bit Systems
Windows 10 Version 1809 for ARM64-based Systems
Windows 10 Version 1809 for x64-based Systems
Windows 10 Version 20H2 for 32-bit Systems
Windows 10 Version 20H2 for ARM64-based Systems
Windows 10 Version 20H2 for x64-based Systems
Windows 10 Version 21H2 for 32-bit Systems
Windows 10 Version 21H2 for ARM64-based Systems
Windows 10 Version 21H2 for x64-based Systems
Windows 10 Version 22H2 for 32-bit Systems
Windows 10 Version 22H2 for ARM64-based Systems
Windows 10 Version 22H2 for x64-based Systems
Windows 11 version 21H2 for ARM64-based Systems
Windows 11 version 21H2 for x64-based Systems
Windows 11 Version 22H2 for ARM64-based Systems
Windows 11 Version 22H2 for x64-based Systems
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 x64-based Systems Service Pack 2
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
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 2022
Windows Server 2022 (Server Core installation)