CVE-2016-7185 in Windows
Summary
by MITRE
The kernel-mode drivers in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, and Windows 10 Gold, 1511, and 1607 allow local users to gain privileges via a crafted application, aka "Win32k Elevation of Privilege Vulnerability." a different vulnerability than CVE-2016-3266, CVE-2016-3376, and CVE-2016-7211.
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Analysis
by VulDB Data Team • 05/04/2025
The CVE-2016-7185 vulnerability represents a critical privilege escalation flaw within the Windows kernel-mode drivers, specifically affecting multiple versions of the windows operating system including vista sp2 server 2008 sp2 and r2 sp1 windows 7 sp1 windows 81 windows server 2012 gold and r2 windows rt 81 and windows 10 gold 1511 and 1607. this vulnerability operates within the win32k.sys driver which serves as the user-mode component responsible for graphics rendering and window management in windows operating systems. the flaw allows local attackers to execute malicious code with elevated privileges by crafting a specially designed application that exploits improper validation of user-mode input within kernel-mode contexts.
the technical nature of this vulnerability stems from inadequate input validation within the win32k.sys driver which processes graphics-related api calls from user-mode applications. when a malicious application submits crafted parameters to graphics functions such as those related to window management or graphics device interface operations, the kernel-mode driver fails to properly validate these inputs before processing them. this validation failure creates a path where untrusted data can be manipulated to alter kernel memory structures or execute arbitrary code with system-level privileges. the vulnerability specifically manifests when the driver processes certain graphics operations that involve user-mode pointers or structures that should be validated before being dereferenced in kernel space.
the operational impact of CVE-2016-7185 is significant as it enables local privilege escalation attacks that can be exploited by malware or attackers who have already gained user-level access to a target system. once exploited, the vulnerability allows attackers to bypass standard user-mode security controls and execute code with kernel-level privileges, providing complete system compromise. this means that an attacker who gains access to a user account can leverage this vulnerability to elevate their privileges to system administrator or kernel-level access, effectively breaking out of the user-mode sandbox and gaining full control over the operating system. the attack requires only local access to the target system since the vulnerability is a local privilege escalation flaw rather than a remote attack vector.
the vulnerability aligns with common attack patterns documented in the attack tactic and technique framework, particularly mapping to privilege escalation techniques where attackers leverage kernel-mode vulnerabilities to gain elevated system access. from a cwes perspective this represents a classic case of weakness in validation of input to kernel-mode code, specifically covering cwes related to improper validation of input parameters and privilege escalation through kernel-mode flaws. the vulnerability also demonstrates characteristics consistent with the attack pattern of exploiting trusted processes and manipulating kernel data structures through user-mode applications.
mitigation strategies for CVE-2016-7185 primarily involve applying the official microsoft security updates that address the underlying kernel-mode driver vulnerability. organizations should prioritize immediate deployment of the relevant security patches to all affected windows versions. additional defensive measures include implementing application whitelisting policies to prevent execution of unsigned or untrusted applications, enabling user access control features such as windows defender application control, and monitoring for suspicious graphics-related api calls that might indicate exploitation attempts. system administrators should also consider implementing network segmentation and least privilege access controls to limit the potential impact of successful exploitation, as the vulnerability requires local system access to be exploited. the patching strategy should be comprehensive across all affected windows operating system versions to ensure complete protection against this specific privilege escalation vector.