CVE-2022-47469 in SC9863A
Summary
by MITRE • 05/09/2023
In ext4fsfilter driver, there is a possible out of bounds read due to a missing bounds check. This could local denial of service with System execution privileges needed.
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Analysis
by VulDB Data Team • 01/28/2025
The vulnerability identified as CVE-2022-47469 resides within the ext4fsfilter driver component of a Windows operating system kernel-mode driver. This driver serves as a file system filter that intercepts and processes file system operations, particularly within the ext4 file system implementation. The flaw manifests as a missing bounds check that allows for an out-of-bounds read condition when processing specific file system requests. Such vulnerabilities in kernel-mode drivers represent critical security concerns as they can potentially be exploited to gain elevated privileges or cause system instability.
The technical implementation of this vulnerability stems from inadequate input validation within the driver's processing logic. When the ext4fsfilter driver receives file system operations, it fails to properly validate the boundaries of data structures or buffer sizes before accessing memory locations. This missing bounds check creates a scenario where an attacker can craft malicious input that causes the driver to read memory beyond its intended boundaries. The out-of-bounds read typically occurs when processing file attributes, directory entries, or other metadata structures that the driver must parse and validate. This type of vulnerability falls under CWE-129, which specifically addresses insufficient bounds checking in software implementations.
The operational impact of this vulnerability extends beyond simple denial of service conditions. While the initial report indicates a local denial of service requiring system execution privileges, the underlying nature of kernel-mode vulnerabilities suggests potential for privilege escalation or system compromise. An attacker with local access and system privileges could exploit this condition to cause the system to crash or behave unpredictably. The vulnerability's exploitation could lead to a complete system halt, forcing administrators to reboot the affected system and potentially resulting in data loss or service interruption. This aligns with ATT&CK technique T1499.001, which covers system shutdown/reboot attacks that can cause denial of service conditions.
Mitigation strategies for CVE-2022-47469 should prioritize immediate patch deployment from Microsoft, as the vulnerability exists within the operating system kernel components. System administrators should also implement monitoring solutions to detect anomalous file system behavior that might indicate exploitation attempts. Additional defensive measures include restricting local user privileges where possible, implementing proper access controls for file system operations, and maintaining up-to-date security patches across all system components. The vulnerability demonstrates the critical importance of bounds checking in kernel-mode code and highlights the need for comprehensive code review processes that focus on memory safety. Organizations should also consider implementing runtime protection mechanisms that can detect and prevent out-of-bounds memory access patterns, particularly in file system filter drivers that handle untrusted input from various sources.