On April 8, 2025, Microsoft released a comprehensive set of security updates addressing multiple vulnerabilities across its product suite. These updates are critical for maintaining system integrity and protecting against potential exploits.
Overview of the April 8, 2025 Security Updates
Microsoft's April 2025 Patch Tuesday introduced fixes for 126 vulnerabilities spanning various products, including Windows operating systems, Microsoft Office, Visual Studio, and Azure services. The most severe of these vulnerabilities could allow for remote code execution, potentially enabling attackers to install programs, view or change data, or create new accounts with full user rights. (its.ny.gov)
Key Vulnerabilities Addressed
Among the critical vulnerabilities patched are:
- Windows Local Security Authority (LSA): A flaw that could allow attackers to execute arbitrary code with elevated privileges.
- Windows NTFS: A vulnerability that might enable unauthorized access to sensitive data.
- Windows Routing and Remote Access Service (RRAS): An issue that could permit remote code execution.
- Microsoft Edge (Chromium-based): Multiple vulnerabilities that could lead to information disclosure or remote code execution.
Specific Updates for Windows Versions
The April 8, 2025 updates include cumulative patches for various Windows versions:
- Windows 11 Version 24H2: KB5055523
- Windows 11 Versions 22H2 and 23H2: KB5055528
- Windows 10 Versions 19044.5737 and 19045.5737: KB5055518
Impact on Windows Server
For Windows Server environments, the updates are equally critical. The April 8, 2025 release includes cumulative updates for supported Windows Server versions, addressing vulnerabilities that could affect server stability and security. (borncity.com)
Kerberos Authentication Vulnerability
A notable issue addressed in this update cycle is a Kerberos authentication vulnerability. Microsoft provided a fix requiring administrators to:
- Update: Apply Windows updates released on or after April 8, 2025, to all Domain Controllers.
- Monitor: Watch for new event logs on Domain Controllers to identify Certificate Authorities (CAs) not in the NTAuth store.
- Enable Enforcement: Once confirmed that no certificates are issued by unauthorized CAs, enable Enforcement Mode to block vulnerable authentication attempts.
End of Support for Certain Products
It's also important to note that several Microsoft products are reaching the end of support in 2025. For instance, Dynamics GP 2015 and Dynamics GP 2015 R2 will end support on April 8, 2025. Organizations using these products should plan for upgrades or migrations to supported versions to ensure continued security and functionality. (learn.microsoft.com)
Recommendations for Users and Administrators
To ensure systems remain secure and functional:
- Apply Updates Promptly: Install the April 8, 2025, security updates across all applicable systems.
- Review System Configurations: Ensure that all systems, especially Domain Controllers, are configured correctly to utilize the latest security patches effectively.
- Monitor for Anomalies: Keep an eye on system logs and security alerts to detect any unusual activities that might indicate attempted exploits.
- Plan for Product Lifecycles: Identify any products nearing end-of-support dates and develop a strategy for upgrading or migrating to supported versions.
Source: Microsoft Support April 8, 2025—Baseline - Microsoft Support