CVE-2018-8484 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 2012 R2, Windows RT 8.1, Windows Server 2012, Windows Server 2019, Windows Server 2016, Windows 8.1, Windows 10, Windows 10 Servers.
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Analysis
by VulDB Data Team • 05/23/2023
The vulnerability identified as CVE-2018-8484 represents a critical elevation of privilege flaw within the DirectX Graphics Kernel driver component of Microsoft Windows operating systems. This issue resides in the dxgkrnl.sys driver which manages graphics processing operations and memory management for DirectX graphics functionality. The flaw manifests when the driver fails to properly validate or handle memory objects during graphics rendering operations, creating a pathway for malicious actors to escalate their privileges from standard user level to system level access.
This vulnerability operates at the kernel level of the operating system, making it particularly dangerous as it bypasses normal security boundaries that separate user applications from system processes. The improper handling of memory objects occurs during graphics kernel operations where the driver does not adequately verify the integrity or legitimacy of memory references. This weakness allows an attacker to craft specific graphics operations that cause the kernel driver to execute arbitrary code with elevated privileges. The vulnerability affects multiple Windows versions including server editions and client operating systems, demonstrating its widespread impact across Microsoft's product portfolio.
The operational impact of CVE-2018-8484 extends beyond simple privilege escalation as it enables attackers to gain complete system control without requiring physical access or administrative credentials. Attackers can exploit this vulnerability through various attack vectors including malicious applications, compromised websites, or even through social engineering techniques that trick users into executing harmful graphics-intensive software. Once exploited, the attacker can install malware, modify system files, access sensitive data, or establish persistent backdoors within the compromised system. The vulnerability's presence in graphics drivers makes it particularly challenging to detect and mitigate as legitimate graphics applications may trigger the exploit during normal operation.
Security researchers have classified this vulnerability according to CWE-119, which addresses "Improper Access to Memory" and specifically relates to insufficient validation of memory access operations. The exploitability of this flaw aligns with ATT&CK technique T1068, "Exploitation for Privilege Escalation," where adversaries leverage software vulnerabilities to gain higher-level permissions. Microsoft's patch management response included releasing security updates through the Windows Update system, but organizations needed to implement comprehensive patching strategies across their infrastructure. Mitigation strategies should include immediate deployment of Microsoft security patches, network segmentation to limit potential attack surfaces, and enhanced monitoring of system logs for unusual graphics kernel activity. Additionally, implementing application whitelisting policies and restricting user privileges can reduce the risk of successful exploitation, while regular security assessments help identify systems that may require additional protection measures.