CVE-2016-8824 in GPU Driver
Summary
by MITRE
All versions of NVIDIA Windows GPU Display Driver contain a vulnerability in the kernel mode layer (nvlddmkm.sys) handler for DxgDdiEscape where improper access controls allow a regular user to write a part of the registry intended for privileged users only, leading to escalation of privileges.
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Analysis
by VulDB Data Team • 07/09/2019
The vulnerability identified as CVE-2016-8824 resides within NVIDIA's Windows GPU Display Driver kernel mode component known as nvlddmkm.sys. This flaw specifically affects the DxgDdiEscape handler which is responsible for processing escape sequences in the DirectX graphics subsystem. The vulnerability represents a critical access control failure that undermines the fundamental security boundaries between user-mode and kernel-mode operations. According to the Common Weakness Enumeration standard, this issue maps to CWE-284 which describes improper access control vulnerabilities, particularly those involving insufficient privileges or inadequate access restriction mechanisms. The flaw exists in the kernel mode driver layer where legitimate user processes can exploit improper validation of escape command parameters.
The technical exploitation of this vulnerability occurs when a regular user process attempts to invoke the DxgDdiEscape function with specially crafted parameters that bypass normal access controls. The kernel mode handler fails to properly validate the privileges of the calling process, allowing unprivileged users to write to registry locations that should only be accessible to privileged system components. This misconfiguration enables arbitrary registry modifications that can be leveraged to manipulate system settings, modify driver behavior, or establish persistent backdoors. The registry entries targeted by this vulnerability are typically reserved for privileged operations and system configuration, making the access violation particularly concerning from a security perspective.
Operationally, this vulnerability creates a significant escalation of privileges threat model where standard user accounts can gain elevated system access without requiring administrative privileges or complex exploitation techniques. The impact extends beyond simple privilege escalation as attackers can modify critical system registry entries that control GPU driver behavior, graphics settings, or even system boot parameters. This vulnerability directly maps to several MITRE ATT&CK techniques including privilege escalation through kernel exploitation and registry modification. The attack surface is particularly dangerous because it operates at the kernel level where user-mode restrictions are bypassed entirely, allowing attackers to manipulate system components that should remain protected from unauthorized access.
Mitigation strategies for CVE-2016-8824 should prioritize immediate driver updates from NVIDIA, as the vulnerability was addressed in subsequent driver releases. System administrators should implement the principle of least privilege by restricting user accounts from running GPU-intensive applications that might trigger this vulnerability. Additionally, monitoring registry modifications and implementing application whitelisting policies can help detect and prevent exploitation attempts. The vulnerability demonstrates the critical importance of kernel mode security validation and proper access control enforcement in graphics driver implementations. Organizations should also consider implementing runtime protection mechanisms and regularly auditing system configurations to identify any potential registry modifications that might indicate exploitation attempts. This vulnerability serves as a reminder of the inherent risks when privileged system components fail to properly validate access controls and maintain proper security boundaries between different privilege levels.