CVE-2018-8400 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 10 Servers, Windows 10. This CVE ID is unique from CVE-2018-8401, CVE-2018-8405, CVE-2018-8406.
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Analysis
by VulDB Data Team • 05/02/2023
The DirectX Graphics Kernel driver vulnerability identified as CVE-2018-8400 represents a critical elevation of privilege flaw within the Windows operating system ecosystem. This vulnerability specifically impacts the DirectX Graphics Kernel (DXGKRNL) component that manages graphics processing and memory allocation for graphical operations. The flaw manifests when the driver fails to properly validate or handle memory objects during graphics rendering processes, creating potential attack vectors for malicious actors to escalate their privileges from standard user level to system level access. The vulnerability affects multiple Windows 10 server variants and client versions, making it particularly concerning for enterprise environments where graphics-intensive applications are commonly deployed. Security researchers have noted that this issue is distinct from other related vulnerabilities in the same vulnerability family including CVE-2018-8401, CVE-2018-8405, and CVE-2018-8406, each representing different aspects of DirectX graphics kernel security flaws.
The technical implementation of this vulnerability stems from improper memory management practices within the DXGKRNL driver module. When graphics applications request memory allocation for rendering operations, the driver must properly validate the memory objects to prevent unauthorized access or manipulation. In this case, the driver fails to adequately check memory object boundaries or handle specific memory access patterns, allowing attackers to craft malicious graphics operations that can trigger memory corruption. This memory handling flaw can be exploited through carefully constructed graphics commands that manipulate memory objects in ways that bypass normal privilege checks. The vulnerability operates at the kernel level, meaning that successful exploitation can grant attackers complete control over the affected system, including the ability to install programs, modify system configurations, and access all user data. This type of flaw directly aligns with CWE-119, which addresses "Improper Access to Memory" and represents a classic example of memory safety issues in kernel-mode drivers.
The operational impact of CVE-2018-8400 extends beyond simple privilege escalation, creating significant risks for enterprise security postures and system integrity. Attackers who successfully exploit this vulnerability can gain SYSTEM-level privileges without requiring administrator credentials, making it particularly dangerous in environments where users have standard accounts but need graphics-intensive applications. The vulnerability is especially concerning because it can be exploited through legitimate graphics applications, potentially allowing attackers to remain undetected while gaining full system control. Organizations running Windows 10 servers and client systems are at risk of complete system compromise, as the attacker can leverage this privilege escalation to install persistent backdoors, exfiltrate sensitive data, or deploy additional malware. The nature of this vulnerability means that exploitation can occur through various attack vectors including malicious software installation, web-based attacks, or even physical access scenarios where an attacker can run graphics-intensive applications on the target system. This vulnerability has been categorized under the MITRE ATT&CK framework as part of the privilege escalation techniques, specifically targeting the 'Exploitation for Privilege Escalation' tactic.
Mitigation strategies for CVE-2018-8400 should focus on immediate patch deployment and system hardening measures to prevent exploitation. Microsoft released security updates for this vulnerability in their regular monthly security bulletins, and organizations should prioritize applying these patches across all affected Windows 10 systems and servers. Additionally, system administrators should implement monitoring solutions to detect unusual graphics driver behavior or memory access patterns that might indicate exploitation attempts. Network segmentation and least privilege principles should be enforced to limit potential damage even if exploitation occurs. The vulnerability highlights the importance of kernel-mode driver security and proper memory management practices in operating system design, making it a critical focus area for both security researchers and system administrators. Organizations should also consider implementing application whitelisting policies for graphics-intensive applications and monitoring for unauthorized graphics driver modifications. Regular security assessments and vulnerability scanning should include checks for outdated graphics drivers that might be vulnerable to similar memory handling flaws, as this type of vulnerability often indicates broader security issues within the graphics subsystem that could affect other components of the Windows operating system.