CVE-2019-1282 in Windows
Summary
by MITRE
An information disclosure exists in the Windows Common Log File System (CLFS) driver when it fails to properly handle sandbox checks, aka 'Windows Common Log File System Driver Information Disclosure Vulnerability'.
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Analysis
by VulDB Data Team • 08/20/2020
The Windows Common Log File System CLFS driver vulnerability represents a critical information disclosure flaw that affects the core logging infrastructure of Microsoft Windows operating systems. This vulnerability specifically manifests within the CLFS component which manages common log file structures used by various Windows services and applications for transactional logging operations. The issue arises from inadequate sandbox validation mechanisms within the driver's processing logic, creating potential pathways for unauthorized information exposure. The vulnerability impacts multiple Windows versions including Windows 7, Windows Server 2008 R2, Windows 8.1, Windows Server 2012, Windows Server 2012 R2, Windows 10, and Windows Server 2016, making it a widespread concern across enterprise environments. From a cybersecurity perspective, this vulnerability falls under the CWE-200 category for "Information Exposure" and aligns with ATT&CK technique T1082 for system information discovery, as it enables adversaries to gather sensitive system data through improper access controls.
The technical exploitation of this vulnerability occurs when the CLFS driver processes certain log file operations without sufficient sandbox validation checks. During normal operation, the CLFS driver handles transactional logging for various Windows components including the Windows Update service, Event Viewer, and other system services that rely on structured logging mechanisms. When the driver encounters specific log file access patterns, it fails to properly validate the security context of the requesting process, potentially allowing lower-privileged users or processes to access log file structures that should be restricted. This improper handling of sandbox checks creates a condition where sensitive information stored within the common log file structures could be exposed to unauthorized entities. The flaw essentially allows for privilege escalation scenarios where standard user accounts might gain access to system-level logging information that typically requires elevated privileges to access.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can facilitate more sophisticated attack vectors within compromised environments. An attacker who successfully exploits this vulnerability could potentially access detailed transaction logs, system event records, and other sensitive metadata that might reveal system configurations, user activities, or application behaviors. This information could be leveraged for further exploitation attempts, including targeted attacks against specific services or users, or for crafting more convincing social engineering campaigns. The vulnerability particularly affects environments where Windows services rely heavily on transactional logging for operational integrity, as the exposed information could reveal patterns of system usage or application behavior that would otherwise remain hidden. Organizations using Windows systems in regulated environments or those handling sensitive data face heightened risk due to the potential for compliance violations when such information disclosure occurs.
Mitigation strategies for this vulnerability require immediate implementation of Microsoft security updates and patches to address the underlying driver flaw. System administrators should prioritize patch deployment across all affected Windows versions, particularly in enterprise environments where the risk of exploitation is higher. Additional protective measures include implementing strict access controls for log file directories, monitoring for unusual access patterns to common log structures, and applying principle of least privilege configurations for system services that interact with CLFS. Network segmentation and intrusion detection systems should be configured to monitor for potential exploitation attempts targeting this vulnerability. Organizations should also conduct thorough security assessments to identify any custom applications or services that might be leveraging CLFS functionality in ways that could amplify the impact of this vulnerability. The vulnerability demonstrates the critical importance of proper sandbox validation in kernel-mode drivers and highlights the need for comprehensive security testing of system components that handle sensitive data processing operations.