CVE-2017-8590 in Windows
Summary
by MITRE
Microsoft Windows 7 SP1, Windows Server 2008 SP2 and R2 SP1, Windows 8.1 and Windows RT 8.1, Windows Server 2012 and R2, Windows 10 Gold, 1511, 1607, 1703, and Windows Server 2016 allows an elevation of privilege vulnerability due to the way that the Windows Common Log File System (CLFS) driver handles objects in memory, aka "Windows CLFS Elevation of Privilege Vulnerability".
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Analysis
by VulDB Data Team • 09/14/2024
The Windows Common Log File System CLFS driver vulnerability represents a critical elevation of privilege flaw that affects multiple Microsoft Windows operating systems including Windows 7 SP1 through Windows 10 versions 1511, 1607, and 1703 along with their respective server editions. This vulnerability specifically resides within the kernel-mode driver component that manages the Common Log File System, which is responsible for providing a consistent logging interface for applications and system components to write structured log data. The flaw manifests in the improper handling of objects in memory during CLFS operations, creating a condition where malicious code can manipulate kernel memory structures to gain elevated privileges. According to CWE-121, this vulnerability falls under the category of stack-based buffer overflow conditions where insufficient control of a resource's size leads to memory corruption, making it particularly dangerous as it operates at the kernel level where system privileges are highest. The vulnerability stems from inadequate validation of input parameters and memory management within the CLFS driver's object handling routines.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass potential system compromise and persistent access. Attackers exploiting this flaw can elevate their privileges from standard user level to SYSTEM level, enabling complete control over affected systems. The attack surface is particularly concerning as it affects widely deployed operating system versions including Windows 7 and Server 2008 R2, which remain in use across enterprise environments. This vulnerability aligns with ATT&CK technique T1068 which describes the use of local privilege escalation techniques, and more specifically with T1059 for the execution of malicious code within the kernel context. The exploitation process typically involves crafting malicious CLFS log files or manipulating existing log operations to trigger memory corruption, followed by leveraging the corrupted memory to execute arbitrary code with elevated privileges. This type of vulnerability is classified under the broader category of kernel-mode exploits that can be particularly devastating as they bypass most traditional user-mode security controls and can remain undetected for extended periods.
Mitigation strategies for this vulnerability require immediate patch deployment through Microsoft's security updates, specifically the patches released in the July 2017 security bulletin. Organizations should prioritize patching across all affected Windows versions, particularly those running Windows 7, Windows Server 2008 R2, and the corresponding server editions. The vulnerability can also be mitigated through runtime protections such as Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR) that make exploitation more difficult. System administrators should implement the principle of least privilege by limiting user accounts to standard privileges and avoiding administrative rights for routine operations. Additional protective measures include disabling unnecessary services and features, implementing network segmentation to limit lateral movement, and monitoring for suspicious log file operations. The vulnerability also highlights the importance of regular security assessments and vulnerability scanning to identify systems that may not have received critical updates. Organizations should also consider implementing endpoint detection and response solutions that can detect anomalous kernel-mode activities that might indicate exploitation attempts. Given the nature of kernel-mode vulnerabilities, the recommended approach combines immediate patch management with layered defensive strategies to minimize risk exposure.