CVE-2022-23286 in Windows
Summary
by MITRE • 03/09/2022
Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability.
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Analysis
by VulDB Data Team • 03/11/2022
The Windows Cloud Files Mini Filter Driver vulnerability represents a critical elevation of privilege flaw that exists within the operating system's file filtering infrastructure. This vulnerability specifically affects the cloud files mini filter driver component that handles file operations in cloud storage environments. The flaw enables attackers to escalate their privileges from standard user level to SYSTEM level, effectively bypassing critical security boundaries. The vulnerability stems from improper validation of input parameters within the driver's handling of cloud file operations, creating a path for malicious code execution with elevated privileges.
The technical implementation of this vulnerability involves a flaw in how the mini filter driver processes certain file system requests related to cloud storage synchronization. When legitimate user processes interact with cloud files, the driver fails to properly validate the memory access patterns and parameter values, allowing for memory corruption that can be exploited to execute arbitrary code. This issue manifests through the manipulation of file operations that traverse the cloud files filter stack, where the driver's validation logic contains a critical oversight in handling specific data structures. The vulnerability is particularly concerning because it operates at the kernel level within the file system filter driver, making it difficult to detect and exploit with traditional user-mode protections.
From an operational impact perspective, this vulnerability creates a severe security risk for organizations relying on Windows cloud storage solutions. Attackers can leverage this flaw to gain SYSTEM-level access without requiring authentication, effectively allowing them to bypass all local security controls and access sensitive system resources. The exploitation of this vulnerability can result in complete system compromise, enabling attackers to install persistent backdoors, exfiltrate data, modify system configurations, and establish footholds for further lateral movement within the network. The impact extends beyond individual systems to potentially affect entire enterprise environments where cloud storage integration is prevalent, as the vulnerability affects the core file system filtering mechanisms that protect against unauthorized access to system resources.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security hardening measures. Microsoft has released security patches that address the specific validation issues within the cloud files mini filter driver, requiring organizations to apply these updates promptly across all affected systems. Organizations should implement network monitoring to detect unusual file system activity patterns that might indicate exploitation attempts, particularly around cloud file synchronization operations. The principle of least privilege should be enforced by limiting user access to cloud storage features and implementing strict access controls for file system operations. Additionally, organizations should consider disabling unnecessary cloud storage integration features when they are not required for business operations, reducing the attack surface for potential exploitation. This vulnerability aligns with CWE-121 and CWE-122 categories related to buffer overflow conditions and improper restriction of operations within a recognized access control model. The ATT&CK framework categorizes this vulnerability under T1068 for exploit for privilege escalation and T1547 for registry run keys and startup folder, as exploitation typically involves creating persistent access mechanisms. Security teams should monitor for indicators of compromise related to abnormal file system behavior and implement comprehensive endpoint detection and response capabilities to identify and block exploitation attempts.