CVE-2024-38196 in Windows
Summary
by MITRE • 08/13/2024
Windows Common Log File System Driver Elevation of Privilege Vulnerability
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Analysis
by VulDB Data Team • 07/08/2026
This vulnerability exists in the Windows Common Log File System Driver component which handles logging operations for various system services and applications. The flaw arises from improper validation of user-supplied data when processing log file operations, allowing malicious actors to manipulate the logging mechanism and potentially escalate their privileges within the operating system. The vulnerability specifically affects the clfs.sys driver which manages the common log file system and is commonly used by Windows services for structured logging operations. Attackers can exploit this issue by crafting specially formatted log entries that trigger buffer overflow conditions or improper memory handling within the driver. This type of vulnerability falls under CWE-121 Stack-based Buffer Overflow, where insufficient bounds checking allows attackers to overwrite adjacent memory locations. The exploitation typically occurs when legitimate user processes attempt to write log data that exceeds allocated buffer sizes, causing unpredictable behavior and potential code execution in kernel space.
The operational impact of this privilege escalation vulnerability is significant as it can allow local attackers with standard user privileges to gain elevated system rights without requiring additional authentication or complex attack vectors. Once successfully exploited, the malicious actor could execute arbitrary code with kernel-level privileges, potentially leading to complete system compromise. The vulnerability affects multiple Windows versions including windows 7 through windows 10 and server editions, making it a widespread concern for enterprise environments. Security researchers have identified that this flaw can be leveraged in conjunction with other techniques such as privilege escalation attacks or lateral movement within compromised networks, aligning with ATT&CK technique T1068 Privilege Escalation and T1547.001 Registry Run Keys. The vulnerability's exploitation typically requires a user to perform specific actions that trigger the logging mechanism, often through legitimate system processes that write to log files.
Mitigation strategies for this vulnerability include immediate deployment of Microsoft security updates which address the underlying buffer overflow conditions in the clfs.sys driver. Organizations should implement the principle of least privilege by ensuring that user accounts have minimal necessary permissions and avoid running services with elevated privileges when possible. Network segmentation and monitoring solutions should be configured to detect unusual logging activity or attempts to manipulate log file structures. System administrators should also consider implementing application whitelisting policies to restrict which applications can write to system logging locations, reducing the attack surface for potential exploitation. Additional protective measures include enabling Windows Defender Application Control or similar technologies to prevent unauthorized code execution and configuring security auditing to monitor access patterns to critical logging components.
The vulnerability demonstrates how seemingly routine system functions like logging can become attack vectors when proper input validation is absent from kernel-level drivers. This flaw highlights the importance of rigorous security testing for system drivers, particularly those that handle data from potentially untrusted sources. Organizations should maintain comprehensive patch management processes that include timely installation of security updates and conduct regular vulnerability assessments targeting kernel components. The exploitation patterns associated with this vulnerability align with ATT&CK tactic TA0004 Privilege Escalation and demonstrate how attackers often target system services that operate with elevated privileges to gain unauthorized access to critical system resources. Regular monitoring of system logs for signs of privilege escalation attempts or unusual file access patterns can provide early warning indicators of potential exploitation attempts against this class of vulnerability.