CVE-2017-8494 in Windows
Summary
by MITRE
Microsoft Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016 allow a locally-authenticated attacker to run a specially crafted application on a targeted system when Windows Secure Kernel Mode fails to properly handle objects in memory, aka "Windows Elevation of Privilege Vulnerability".
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Analysis
by VulDB Data Team • 08/20/2024
This vulnerability represents a critical elevation of privilege flaw in Microsoft Windows operating systems affecting versions including Windows 10 Gold, 1511, 1607, 1703, and Windows Server 2016. The issue stems from improper handling of objects in memory within Windows Secure Kernel Mode, creating a pathway for locally authenticated attackers to escalate their privileges from standard user level to system level access. The vulnerability is categorized under CWE-125 as an out-of-bounds read condition, where the secure kernel mode fails to properly validate memory objects during processing. This flaw enables attackers to execute malicious code with elevated privileges, potentially allowing them to gain full control over the affected system.
The technical exploitation of CVE-2017-8494 occurs when a specially crafted application is executed on a targeted system, leveraging the memory handling deficiency in Secure Kernel Mode. This vulnerability operates at the kernel level, making it particularly dangerous as it can bypass standard security mechanisms and user access controls. The flaw specifically manifests when Windows attempts to process certain memory objects, where insufficient validation allows for memory corruption that can be leveraged for privilege escalation. From an operational perspective, this vulnerability aligns with ATT&CK technique T1068 which describes the use of local privilege escalation techniques to gain higher system privileges.
The impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with the capability to execute arbitrary code with system-level privileges, potentially leading to complete system compromise. An attacker who successfully exploits this vulnerability could install programs, modify system configurations, access sensitive data, or establish persistent access to the compromised system. The vulnerability affects systems running Windows 10 versions 1511, 1607, and 1703, as well as Windows Server 2016, making it a widespread concern for organizations with these operating systems in production environments. The local authentication requirement means that an attacker must first have valid credentials on the system, but once achieved, the privilege escalation can be devastating.
Organizations should prioritize immediate remediation through Microsoft security updates that address the memory handling issue in Secure Kernel Mode. The vulnerability demonstrates the critical importance of kernel-level security validation and proper memory management practices. Security teams should implement comprehensive monitoring for suspicious privilege escalation activities and ensure that all Windows systems are updated with the latest security patches. The vulnerability also highlights the need for layered security approaches including application whitelisting, privileged access management, and regular security assessments to detect potential exploitation attempts. Additionally, organizations should consider implementing network segmentation and monitoring to detect lateral movement attempts that may follow successful exploitation of this vulnerability.