CVE-2022-24521 in Windows
Summary
by MITRE • 04/15/2022
Windows Common Log File System Driver Elevation of Privilege Vulnerability
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Analysis
by VulDB Data Team • 10/30/2025
This vulnerability resides in the Windows Common Log File System Driver component which is part of the Windows operating system's logging infrastructure. The flaw manifests as an elevation of privilege vulnerability that allows a local attacker to escalate their privileges from a standard user account to system level access. The vulnerability specifically affects the way the Common Log File System driver handles certain input validation processes within its kernel-mode operations, creating a path for malicious code execution with elevated privileges. This type of vulnerability represents a critical security weakness in the Windows kernel architecture where proper access controls and privilege boundaries have been bypassed.
The technical implementation of this vulnerability stems from inadequate input validation within the CLFS driver's handling of log file operations. When processing certain log file structures or operations, the driver fails to properly validate the memory access patterns and buffer boundaries, potentially allowing an attacker to manipulate kernel memory structures through crafted input data. The vulnerability can be exploited by a local user who has already gained access to the system, typically through a phishing attack or other initial compromise methods, to then escalate their privileges to SYSTEM level. This flaw operates at the kernel level and leverages the driver's inherent trust in certain log file operations without sufficient validation checks, making it particularly dangerous as it bypasses standard user-mode security mechanisms.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it can enable attackers to gain complete control over affected systems. Once escalated to SYSTEM privileges, attackers can manipulate system files, install malware, access all user data, and potentially establish persistent backdoors within the compromised environment. The vulnerability affects multiple Windows versions including Windows 10 and Windows Server 2019, making it a widespread concern for enterprise environments that have not yet applied the necessary security patches. The exploitation process typically requires local system access, but the privilege escalation aspect means that even limited user accounts can be transformed into full administrative control, presenting a significant risk to network security. Organizations running unpatched systems are particularly vulnerable to this type of attack, as it can serve as a launching point for broader network infiltration and lateral movement activities.
Mitigation strategies for this vulnerability primarily focus on applying the official Microsoft security updates that address the specific kernel-mode validation issues within the CLFS driver. System administrators should prioritize patch deployment across all affected Windows systems, particularly those in enterprise environments where the risk of lateral movement is highest. Additional defensive measures include implementing the principle of least privilege, ensuring that user accounts have minimal necessary permissions, and monitoring for unusual log file access patterns or privilege escalation attempts. Security teams should also consider implementing endpoint detection and response solutions that can identify anomalous kernel-mode activities that might indicate exploitation attempts. From a compliance perspective, this vulnerability aligns with several security standards including those outlined in the CWE catalog under weakness category 269 for improper privilege management, and can be mapped to ATT&CK techniques involving privilege escalation and persistence mechanisms. Organizations should also conduct regular vulnerability assessments to identify systems that may not have received the necessary patches, as this type of vulnerability can remain exploitable for extended periods if left unaddressed.