Windows Updates Renew Expiring Secure Boot Certificates
Microsoft has initiated a process to automatically replace expiring Secure Boot certificates on select Windows 11 24H2 and 25H2 systems. This move aims to enhance security by preventing unauthorized software from running during the startup sequence.
Understanding Secure Boot
Secure Boot is a crucial security feature embedded in UEFI firmware. It only allows trusted bootloaders to operate, thereby blocking potentially harmful software such as rootkits. The process relies on verifying the digital signatures of software against a repository of trusted certificates stored in the device’s firmware.
Automatic Updates for Secure Boot Certificates
On November 2023, Microsoft alerted IT administrators about the impending expiration of Secure Boot certificates. These certificates are crucial for validating UEFI firmware and are set to expire starting in June 2026. If not timely updated, certain personal and business systems may face booting issues.
- Key Dates: Secure Boot certificates expire in June 2026.
- Target Systems: Windows 11 24H2 and 25H2.
Phased Deployment Strategy
The latest Windows quality updates will include a selection of high-confidence device targeting data. This ensures that only eligible devices will receive new Secure Boot certificates. Microsoft stresses the importance of these updates, noting that devices must show sufficient successful update signals to qualify for the new certificates.
Guidelines for IT Administrators
To maintain Secure Boot functionality and protect systems, IT administrators must install the new certificates before the expiration of the old ones. Not doing so could lead to significant security risks, including losing the Windows Boot Manager and Secure Boot protections.
- Failure to update may lead to no longer receiving security updates.
- Risk of compromising serviceability and security of devices.
Deployment Options
While Microsoft is automatically upgrading high-confidence devices via Windows Update, organizations have alternative methods for deploying Secure Boot certificates. These methods include:
- Using registry keys
- Utilizing the Windows Configuration System (WinCS)
- Group Policy settings
Best Practices for Administrators
According to Microsoft’s Secure Boot playbook, administrators should follow these steps:
- Inventory device fleets.
- Verify Secure Boot status using PowerShell or registry keys.
- Apply manufacturer firmware updates.
- Install Microsoft’s certificate updates.
By adhering to these practices, IT teams can ensure the safety and operational integrity of their devices as they transition to the updated Secure Boot certificates.
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