CVE-2016-8825 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 the size of an input buffer is not validated, leading to denial of service or potential escalation of privileges.
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Analysis
by VulDB Data Team • 07/09/2019
The vulnerability identified as CVE-2016-8825 represents a critical security flaw within NVIDIA's Windows GPU display drivers affecting all versions of the software. This weakness resides in the kernel mode layer component known as nvlddmkm.sys which serves as the core driver interface for graphics processing operations. The vulnerability specifically manifests in the DxgDdiEscape handler function, which processes escape commands sent to the graphics driver from user-mode applications. The flaw stems from inadequate input validation where the driver fails to properly verify the size of buffer data submitted through the DxgDdiEscape interface, creating a potential attack vector that could be exploited by malicious actors.
The technical implementation of this vulnerability allows attackers to manipulate the buffer size parameter during DxgDdiEscape calls, potentially triggering memory corruption conditions within the kernel mode driver. This buffer overflow condition can lead to system instability and denial of service scenarios where legitimate users cannot access graphics functionality. More critically, the vulnerability presents potential privilege escalation opportunities since the kernel mode execution context allows attackers to gain elevated system privileges when exploiting the buffer validation flaw. The nature of this vulnerability aligns with CWE-129, which describes improper validation of input buffers, and falls under the broader category of kernel-mode buffer overflow vulnerabilities that are particularly dangerous due to their potential for system compromise.
The operational impact of CVE-2016-8825 extends beyond simple denial of service conditions to encompass serious security implications for enterprise environments and individual users. Systems utilizing affected NVIDIA GPU drivers become vulnerable to both accidental system crashes and deliberate exploitation attempts that could result in complete system compromise. The vulnerability affects all Windows versions supported by NVIDIA drivers, making it particularly concerning for organizations with diverse computing environments. Attackers could leverage this flaw to execute arbitrary code with kernel-level privileges, potentially leading to persistent backdoor access, data exfiltration, or complete system takeover. From an adversary perspective, this vulnerability maps to ATT&CK technique T1068, which involves the use of local privilege escalation techniques, and T1059, covering command and scripting interpreter usage within compromised systems.
Mitigation strategies for CVE-2016-8825 require immediate action from system administrators and security teams to implement proper driver updates from NVIDIA's official channels. The most effective remediation involves installing the latest NVIDIA GPU display drivers that contain patches addressing the buffer validation flaw in the DxgDdiEscape handler. Organizations should also consider implementing additional security controls such as kernel-mode driver protection features, application whitelisting policies, and monitoring for suspicious DxgDdiEscape API usage patterns. Network segmentation and privilege separation measures can help reduce the potential impact if exploitation occurs, while regular security assessments should verify that all systems have been properly updated. The vulnerability demonstrates the importance of maintaining current driver versions and implementing comprehensive security monitoring for kernel-level activities that could indicate exploitation attempts.