Windows CLFS Driver Elevation of Privilege

What is the Vulnerability?A zero-day vulnerability has recently been identified in the Common Log File System (CLFS) kernel driver. CLFS is a general-purpose logging subsystem within the Windows operating system that provides a high-performance way to store log data for various applications. If successfully exploited, an attacker operating under a standard user account can elevate their privileges.Furthermore, Microsoft has observed that the exploit has been utilized by PipeMagic malware and has attributed this exploitation activity to Storm-2460, which has also leveraged PipeMagic to distribute ransomware. Microsoft has published a blog that provides an in-depth analysis of Microsoft’s findings regarding the CLFS exploit and the associated activities. Exploitation of CLFS zero-day leads to ransomware activity | Microsoft Security BlogWhat is the recommended Mitigation?Microsoft issued security updates to mitigate CVE 2025-29824 on April 8, 2025. FortiGuard Labs strongly advises organizations to prioritize the implementation of security updates.What FortiGuard Coverage is available?FortiGuard Endpoint Vulnerability Service provides a systematic and automated method of patching applications, eliminating manual processes while reducing the attack surface. FortiClient Vulnerability | FortiGuard LabsFortiGuard Labs has blocked all the known Indicators of Compromise (IOCs) linked to the campaign targeting the Windows CLFS Driver Elevation of Privilege vulnerability (CVE 2025-29824).The FortiGuard Incident Response team can be engaged to help with any suspected compromise.Read More