CVE-2024-6768 in Windows
Summary
by MITRE • 08/12/2024
A Denial of Service in CLFS.sys in Microsoft Windows 10, Windows 11, Windows Server 2016, Windows Server 2019, and Windows Server 2022 allows a malicious authenticated low-privilege user to cause a Blue Screen of Death via a forced call to the KeBugCheckEx function.
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Analysis
by VulDB Data Team • 08/14/2024
The vulnerability identified as CVE-2024-6768 represents a critical denial of service flaw within the Windows Common Log File System driver known as CLFS.sys. This driver component plays a fundamental role in managing transactional logging operations across various Microsoft Windows operating systems including Windows 10, Windows 11, Windows Server 2016, Windows Server 2019, and Windows Server 2022. The flaw specifically manifests when an authenticated user with minimal privileges can trigger a system crash through deliberate invocation of the KeBugCheckEx function, which is a kernel-level debugging mechanism designed to halt system operation when critical errors occur.
The technical exploitation of this vulnerability occurs through manipulation of the CLFS.sys driver's internal state management routines. When a malicious user with low privileges successfully forces a call to KeBugCheckEx, the system immediately transitions into a critical error state that results in an immediate system halt and subsequent Blue Screen of Death display. This particular weakness stems from inadequate input validation and error handling within the driver's transaction processing code paths, allowing unauthorized state manipulation that bypasses normal system safeguards. The vulnerability is classified under CWE-476 as a NULL pointer dereference, though the actual exploitation mechanism involves forced system termination rather than simple pointer issues.
From an operational perspective, this vulnerability presents significant risk to enterprise environments where user access controls may not be sufficiently restrictive. The low privilege requirement means that even standard user accounts can potentially trigger system-wide outages, making this a particularly concerning flaw for organizations with less stringent access controls. The impact extends beyond simple service disruption as the forced system crashes can result in data loss, service interruptions, and potential compromise of business continuity operations. Security professionals should note that this vulnerability can be exploited in both targeted attacks against specific systems and as part of broader reconnaissance efforts to identify system weaknesses.
The mitigation strategy for CVE-2024-6768 should prioritize immediate deployment of Microsoft security updates and patches as soon as they become available through standard Windows Update channels. Organizations should also implement enhanced monitoring for unusual system crash patterns and unauthorized access attempts that might indicate exploitation attempts. Network segmentation and privilege reduction measures can help limit the potential impact of successful exploitation attempts, while regular system health monitoring can aid in early detection of system instability. Security teams should consider implementing behavioral analysis tools that can detect anomalous patterns in system call sequences that might indicate exploitation attempts against the CLFS.sys driver. The vulnerability aligns with ATT&CK technique T1499.001 for network denial of service and represents a significant concern for organizations operating under zero trust security models where privilege escalation risks are particularly elevated.