CVE-2024-38135 in Windows
Summary
by MITRE • 08/13/2024
Windows Resilient File System (ReFS) Elevation of Privilege Vulnerability
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Analysis
by VulDB Data Team • 05/20/2025
The Windows Resilient File System ReFS elevation of privilege vulnerability represents a critical security flaw that allows attackers to escalate their privileges within Windows environments. This vulnerability specifically affects the ReFS file system implementation and stems from improper validation of file operations within the storage subsystem. The flaw exists in how ReFS handles certain metadata operations and file system interactions, creating opportunities for malicious code execution with elevated privileges.
The technical root cause of this vulnerability lies in insufficient input validation and improper access control mechanisms within ReFS kernel components. When processing specific file system requests or metadata modifications, the system fails to properly verify the legitimacy of operations performed by unprivileged users. This weakness enables attackers to craft malicious file system operations that bypass normal security boundaries and gain elevated privileges. The vulnerability demonstrates characteristics consistent with CWE-20 Improper Input Validation, where insufficient validation of input parameters leads to unexpected behavior and privilege escalation.
From an operational perspective, this vulnerability poses significant risks to enterprise environments as it allows local attackers to gain SYSTEM-level privileges without requiring administrative credentials. Attackers can exploit this flaw by creating specific file system conditions that trigger the vulnerable code paths in ReFS implementations. The impact extends beyond individual systems as successful exploitation can enable lateral movement within networks and persistent access to sensitive data stores. This vulnerability aligns with ATT&CK technique T1068 Exploitation for Privilege Escalation, where adversaries leverage software flaws to gain elevated privileges.
The attack surface for this vulnerability includes any system running Windows with ReFS volumes enabled, particularly servers and workstations that utilize advanced file system features. Recovery and mitigation efforts require careful consideration of existing ReFS implementations and potential impact on business operations. Organizations must implement immediate patches from Microsoft while also monitoring for exploitation attempts through network security controls and endpoint detection systems. The vulnerability highlights the importance of secure coding practices in kernel-level components and demonstrates how seemingly minor validation gaps can result in severe privilege escalation opportunities.
Security teams should prioritize assessment of ReFS implementations across their environments and establish monitoring procedures to detect anomalous file system behavior that might indicate exploitation attempts. Regular security updates and comprehensive testing of patch deployments remain critical defensive measures against this and similar vulnerabilities. The incident underscores the necessity of maintaining robust security controls even in specialized storage subsystems that are often considered less vulnerable than core operating system components.