CVE-2018-0844 in Windows
Summary
by MITRE
The Windows Common Log File System (CLFS) driver in Windows 7 SP1, Windows 8.1 and RT 8.1, Windows Server 2008 SP2 and R2 SP1, Windows Server 2012 and R2, Windows 10 Gold, 1511, 1607, 1703 and 1709, Windows Server 2016 and Windows Server, version 1709 allows an elevation of privilege vulnerability due to how objects in memory are handled, aka "Windows Common Log File System Driver Elevation Of Privilege Vulnerability". This CVE is unique from CVE-2018-0846.
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Analysis
by VulDB Data Team • 08/18/2024
The Windows Common Log File System CLFS driver vulnerability represents a critical elevation of privilege flaw that affects multiple Windows operating system versions including Windows 7 SP1 through Windows 10 version 1709. This vulnerability stems from improper handling of objects in memory during the operation of the Common Log File System driver, which is responsible for managing transactional logging operations in Windows. The flaw allows a local attacker to escalate their privileges from standard user level to system level, potentially enabling complete system compromise and unauthorized access to sensitive data and system resources. The vulnerability is particularly concerning because it affects both client and server operating systems, including Windows Server 2008 R2 SP1, Windows Server 2012, Windows Server 2016, and various Windows 10 editions.
The technical root cause of this vulnerability lies in how the CLFS driver manages memory objects during certain operations, specifically when handling log file structures and transactional data. According to CWE-121, this represents a classic heap-based buffer overflow condition where improper memory management allows attackers to manipulate object layouts in memory. The vulnerability manifests when the driver processes certain input parameters without adequate validation, leading to memory corruption that can be exploited to execute arbitrary code with kernel-level privileges. This type of vulnerability falls under the ATT&CK technique T1068 which describes "Exploitation for Privilege Escalation" and demonstrates how attackers can leverage kernel-level vulnerabilities to gain system-level control.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with complete control over affected systems. Once exploited, attackers can modify system files, install malicious software, access sensitive data, and potentially establish persistent backdoors. The vulnerability affects systems running Windows 7 SP1, Windows 8.1, Windows Server 2008 SP2, Windows Server 2012 R2, and Windows 10 versions 1511, 1607, 1703, and 1709, making it particularly widespread across the Windows ecosystem. The exploitability factor is relatively high since it requires only local access to the system, meaning an attacker with basic user credentials could potentially leverage this vulnerability to gain system administrator privileges. Organizations with multiple affected systems face significant risk as this vulnerability can be exploited in targeted attacks or as part of broader compromise campaigns.
Mitigation strategies for this vulnerability include immediate deployment of Microsoft security updates and patches that address the memory handling issues in the CLFS driver. System administrators should prioritize patching affected systems and implement additional security controls such as disabling unnecessary services and ensuring proper user access controls. The vulnerability highlights the importance of maintaining up-to-date security patches and demonstrates how kernel-level vulnerabilities can provide attackers with the most powerful forms of privilege escalation. Organizations should also consider implementing monitoring solutions that can detect anomalous behavior patterns consistent with privilege escalation attempts and establish incident response procedures specifically tailored to address kernel-level exploitation attempts. This vulnerability serves as a reminder of the critical importance of maintaining robust security hygiene and the potential consequences of failing to apply timely security updates to operating system components.