CVE-2018-8165 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists when the DirectX Graphics Kernel (DXGKRNL) driver improperly handles objects in memory, aka "DirectX Graphics Kernel Elevation of Privilege Vulnerability." This affects Windows Server 2016, Windows 10, Windows 10 Servers.
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Analysis
by VulDB Data Team • 03/11/2023
The vulnerability identified as CVE-2018-8165 represents a critical elevation of privilege flaw within the DirectX Graphics Kernel driver component of Microsoft Windows operating systems. This issue specifically impacts Windows Server 2016, Windows 10, and Windows 10 Servers, where the DirectX Graphics Kernel (DXGKRNL) driver fails to properly manage memory objects during graphics processing operations. The vulnerability stems from improper handling of graphics kernel objects that allows a malicious actor to escalate their privileges from a standard user account to SYSTEM level access, effectively bypassing critical security boundaries within the operating system. The flaw exists in the kernel-mode driver component responsible for graphics processing and memory management, making it particularly dangerous as it operates at the highest privilege level within the Windows security model.
The technical root cause of this vulnerability lies in the improper validation and handling of graphics objects within the DXGKRNL driver's memory management subsystem. When processing graphics operations, the driver fails to adequately verify the integrity and permissions of memory objects, creating opportunities for privilege escalation attacks. This flaw can be exploited through specially crafted graphics commands or memory operations that manipulate the driver's object handling routines. The vulnerability manifests when legitimate graphics operations interact with malformed or improperly validated kernel objects, allowing an attacker to execute arbitrary code with elevated privileges. According to CWE classification, this represents a weakness in the protection of a resource through improper validation of the resource's properties or the lack of proper access controls during kernel operations. The vulnerability aligns with ATT&CK technique T1068 which describes the use of privilege escalation to gain SYSTEM-level access through kernel-mode exploits.
The operational impact of CVE-2018-8165 is severe and far-reaching, as successful exploitation can result in complete system compromise without requiring physical access or elevated privileges from the initial attacker. Once an attacker achieves privilege escalation through this vulnerability, they can access all system resources, modify critical system files, install malicious software, and potentially establish persistent backdoors within the compromised system. The vulnerability affects systems running vulnerable versions of Windows where DirectX graphics operations are actively used, making it particularly dangerous in enterprise environments where graphics-intensive applications are common. The exploitation process typically requires a user to interact with graphics-intensive applications or be tricked into executing malicious code that triggers the vulnerable driver path. Organizations running affected systems face significant risk of data breaches, system infiltration, and complete loss of system integrity, as the vulnerability provides a direct path to SYSTEM-level access that bypasses traditional user account controls and security mechanisms.
Mitigation strategies for CVE-2018-8165 primarily focus on applying Microsoft's official security patches and updates released through Windows Update or Microsoft Update Catalog. System administrators should prioritize immediate deployment of the security update that addresses the DirectX Graphics Kernel driver vulnerability, as this represents the most effective protection against exploitation attempts. Additionally, organizations should implement network segmentation and access controls to limit potential attack vectors, disable unnecessary graphics services where possible, and monitor system logs for suspicious activities related to graphics driver operations. The vulnerability can be mitigated through proper patch management procedures, ensuring all systems are updated with the latest security patches from Microsoft. Organizations should also consider implementing application whitelisting policies to restrict execution of untrusted graphics applications and maintain comprehensive monitoring of system behavior for signs of privilege escalation attempts. Given the kernel-mode nature of this vulnerability, it is essential to maintain up-to-date security configurations and conduct regular vulnerability assessments to identify and remediate similar issues within the Windows operating system stack.