CVE-2016-3333 in Windows
Summary
by MITRE
The Common Log File System (CLFS) driver in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, and 1607, and Windows Server 2016 allows local users to gain privileges via a crafted application, aka "Windows Common Log File System Driver Elevation of Privilege Vulnerability," a different vulnerability than CVE-2016-0026, CVE-2016-3332, CVE-2016-3334, CVE-2016-3335, CVE-2016-3338, CVE-2016-3340, CVE-2016-3342, CVE-2016-3343, and CVE-2016-7184.
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Analysis
by VulDB Data Team • 09/30/2022
The Common Log File System CLFS driver vulnerability represents a critical privilege escalation flaw affecting multiple windows operating system versions including vista through windows 10 and server 2016. This vulnerability stems from improper handling of kernel-mode operations within the common log file system component that manages transactional logging for applications and system services. The flaw allows local attackers with standard user privileges to execute malicious code that can elevate their privileges to system level access, bypassing normal security boundaries that should prevent such escalation. The vulnerability is particularly concerning because it operates at the kernel level where the most privileged operations occur, making it a prime target for exploitation in advanced persistent threat campaigns. The CLFS driver serves as a foundational component for logging services across the windows ecosystem, making this vulnerability potentially widespread across affected platforms.
The technical implementation of this privilege escalation vulnerability involves exploitation of a flaw in how the CLFS driver processes certain kernel-mode operations and memory management functions. Attackers can craft malicious applications that manipulate the driver's handling of log file operations to trigger memory corruption or improper privilege checks during kernel execution. This typically involves exploiting race conditions or buffer overflow scenarios within the driver's processing logic that fail to properly validate input parameters or maintain proper access controls during log file transactions. The vulnerability specifically targets the driver's interaction with kernel memory structures and privilege management mechanisms, allowing attackers to manipulate the security context of their processes and gain elevated privileges without requiring administrator credentials or explicit system access. This flaw aligns with CWE-119 which addresses memory safety issues in kernel-mode drivers and represents a classic example of an elevation of privilege vulnerability within operating system components.
The operational impact of this vulnerability extends far beyond simple privilege escalation, as it provides attackers with complete system compromise capabilities. Once successfully exploited, attackers can install persistent backdoors, modify system files, access sensitive data, and establish footholds for further lateral movement within networks. The vulnerability affects both desktop and server environments, making it particularly dangerous in enterprise settings where server systems often run with elevated privileges and serve as central points of attack. Organizations with multiple affected systems face significant risk as attackers can leverage this vulnerability to gain unauthorized access to critical infrastructure, potentially leading to data breaches, system corruption, or complete network compromise. The vulnerability's persistence across multiple windows versions means that organizations cannot rely on simple version checks to determine risk, requiring comprehensive patch management and vulnerability assessment strategies.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security posture improvements. Microsoft released security patches through regular update cycles that address the specific kernel-mode flaws in the CLFS driver implementation, requiring organizations to maintain current patch levels across all affected systems. System administrators should implement additional security controls including kernel-mode driver signature enforcement, application whitelisting, and enhanced monitoring of system calls related to logging services. The vulnerability demonstrates the importance of maintaining robust kernel security mechanisms and proper privilege separation in operating system design, aligning with ATT&CK technique T1068 which covers privilege escalation through kernel exploits. Organizations should also consider implementing network segmentation, monitoring for suspicious process creation patterns, and conducting regular security assessments to identify potential exploitation attempts. Given the nature of the vulnerability, it is crucial to maintain comprehensive incident response procedures that can quickly detect and contain exploitation attempts, as the attack surface includes both local and potentially remote exploitation vectors depending on system configurations.