CVE-2017-8561 in Windows
Summary
by MITRE
Windows kernel in Microsoft Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016 allows an elevation of privilege vulnerability due to the way it handles objects in memory, aka "Windows Kernel Elevation of Privilege Vulnerability".
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Analysis
by VulDB Data Team • 12/31/2020
This vulnerability resides within the Windows kernel component of multiple operating system versions including Windows 8.1, Windows Server 2012, Windows RT 8.1, Windows 10 versions 1511, 1607, and 1703, as well as Windows Server 2016. The flaw manifests in how the kernel manages memory objects, creating a condition where malicious code can exploit improper handling of kernel memory structures. The vulnerability is categorized under CWE-121 as a stack-based buffer overflow, though the specific implementation involves memory corruption within kernel space operations. This represents a critical security issue that allows local attackers to escalate their privileges from standard user level to system level execution.
The technical exploitation occurs through improper validation of memory objects within kernel routines, specifically when processing certain data structures that are manipulated during normal system operations. Attackers can leverage this weakness by crafting malicious payloads that trigger the kernel to improperly handle memory references, leading to arbitrary code execution with kernel privileges. The vulnerability exploits the fundamental trust model of the Windows kernel where legitimate system processes are granted elevated privileges. This flaw enables attackers to bypass standard security mechanisms and gain complete control over the affected system, making it particularly dangerous for enterprise environments where system integrity is paramount.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with complete system compromise capabilities. Once exploited, adversaries can install persistent backdoors, modify system files, access all user data, and potentially establish footholds for further lateral movement within networks. The vulnerability affects a broad range of Windows versions, making it a widespread concern for organizations maintaining legacy systems. Security professionals must consider this vulnerability as part of broader attack surface management strategies, particularly when assessing systems that may not receive regular updates or patches. The attack vector typically involves local execution with user privileges, making it difficult to detect through network-based monitoring alone.
Mitigation strategies should focus on immediate patch deployment through Microsoft's security updates, specifically addressing the kernel memory handling routines that enable this privilege escalation. Organizations should implement comprehensive patch management policies and consider deploying additional security controls such as exploit protection mechanisms, application whitelisting, and kernel-mode code integrity checks. The vulnerability aligns with ATT&CK technique T1068 which covers local privilege escalation, and T1059 which encompasses command and scripting interpreter usage for exploitation. System administrators should also monitor for anomalous kernel memory operations and implement behavioral analysis tools to detect potential exploitation attempts. Regular security assessments and vulnerability scanning should include checks for this specific kernel vulnerability to ensure comprehensive protection against this class of attack.