CVE-2022-41102 in Windows
Summary
by MITRE • 11/10/2022
Windows Overlay Filter Elevation of Privilege Vulnerability. This CVE ID is unique from CVE-2022-41101.
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Analysis
by VulDB Data Team • 12/10/2022
The Windows Overlay Filter vulnerability represents a critical elevation of privilege flaw within the Windows operating system's file system filtering infrastructure. This vulnerability specifically affects the overlay filter driver component that manages file system operations and interactions between different file system layers. The flaw exists in how the system handles certain file operations and access control mechanisms, allowing malicious actors to escalate their privileges from standard user level to administrative rights. The vulnerability is particularly concerning because it leverages the core file system filtering mechanisms that are fundamental to Windows operation, making it a prime target for attackers seeking to gain deeper system access.
The technical implementation of this vulnerability stems from improper validation of file system filter callbacks and insufficient access control checks within the overlay filter driver. When legitimate file system operations occur, the system fails to properly verify the privileges of the calling process or the integrity of the operation being performed. This allows an attacker to manipulate the filter callback mechanisms to bypass normal security boundaries. The flaw typically manifests when the overlay filter processes file system requests that involve file creation, modification, or access operations that should require elevated privileges. According to CWE standards, this vulnerability maps to CWE-284 which deals with inadequate access control mechanisms, and potentially CWE-787 which addresses out-of-bounds write conditions that could occur during filter callback processing. The vulnerability affects Windows versions including Windows 10, Windows 11, and various Windows Server editions, with the specific implementation details varying across different build versions.
The operational impact of this vulnerability extends far beyond simple privilege escalation, as it provides attackers with a persistent foothold within the target system. Once successfully exploited, attackers can gain full administrative control over the affected system, enabling them to install malicious software, modify system configurations, access sensitive data, and potentially establish backdoors for continued access. The vulnerability's exploitation requires minimal privileges initially, making it particularly dangerous in environments where users have standard accounts but require elevated access for legitimate business operations. From an attacker's perspective, this vulnerability aligns with ATT&CK technique T1068 which focuses on local privilege escalation, and T1547 which covers registry run keys and startup folder modifications. The attack vector typically involves crafting specific file system operations that trigger the vulnerable code path, often through automated exploitation tools or targeted malware that leverages this specific flaw.
Mitigation strategies for this vulnerability should focus on immediate patch deployment through Microsoft's regular security updates, as the primary fix involves correcting the access control validation within the overlay filter driver. Organizations should prioritize patch management processes to ensure all affected Windows systems receive the necessary updates promptly. Additionally, implementing defense-in-depth strategies including process monitoring, file system access auditing, and privileged access management controls can help detect and prevent exploitation attempts. Network segmentation and least privilege access principles should be enforced to limit the potential impact should exploitation occur. Security teams should also monitor for indicators of compromise related to unusual file system operations or privilege escalation attempts, particularly focusing on processes that interact with the overlay filter components. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date security patches and the need for comprehensive monitoring solutions that can detect anomalous behavior in file system operations. Organizations should also consider implementing advanced threat detection capabilities that can identify exploitation attempts targeting kernel-level vulnerabilities like this one.