CVE-2016-3343 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-2016-3333, CVE-2016-3334, CVE-2016-3335, CVE-2016-3338, CVE-2016-3340, CVE-2016-3342, 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 Microsoft Windows operating systems including Vista SP2 through Windows 10 version 1607 and Windows Server 2016. This vulnerability specifically targets the Windows Common Log File System driver which manages logging operations for applications and system components, making it a core element of the operating system's logging infrastructure. The flaw allows local attackers with standard user privileges to execute malicious code that can elevate their access level to system-level privileges, fundamentally compromising the security model of these operating systems.
The technical implementation of this vulnerability stems from improper input validation and privilege checking within the CLFS driver's handling of specific kernel-mode operations. When a crafted application interacts with the CLFS driver through legitimate system calls, the driver fails to properly validate the privileges of the calling process, allowing unprivileged code to manipulate kernel structures and gain elevated access. This represents a classic kernel-mode privilege escalation vector where the flaw exists in the driver's security checks rather than in the application layer itself. The vulnerability is classified under CWE-264, which covers permissions, privileges, and access controls, specifically focusing on inadequate privilege checking mechanisms.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with complete system control once exploited. Successful exploitation can enable attackers to install malicious software, modify system files, create new user accounts, and access sensitive data across all system components. The widespread affected platforms mean that organizations running any of the listed Windows versions are potentially at risk, making this vulnerability particularly dangerous for enterprise environments. Network attackers could leverage this vulnerability to establish persistent backdoors or deploy additional malware payloads that would otherwise be restricted by standard user privileges.
Mitigation strategies for this vulnerability require immediate patching of all affected systems through Microsoft's security updates, specifically addressing the CLFS driver implementation issues. Organizations should implement comprehensive monitoring for suspicious system activity that might indicate exploitation attempts, particularly focusing on unusual kernel-mode operations. System administrators should also consider implementing additional security controls such as disabling unnecessary logging services and applying the principle of least privilege to limit the potential damage from exploitation. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques and can be used to establish persistence through kernel-mode modifications, making it a significant concern for defensive security operations and incident response procedures.