CVE-2016-3286 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 and 1511 allow local users to gain privileges via a crafted application, aka "Win32k Elevation of Privilege Vulnerability," a different vulnerability than CVE-2016-3249, CVE-2016-3252, and CVE-2016-3254.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 09/01/2022
The vulnerability identified as CVE-2016-3286 represents a critical privilege escalation flaw within the Windows kernel-mode drivers, specifically affecting multiple versions of the Windows operating system including Vista, Server 2008, 7, 8.1, Server 2012, RT 8.1, and Windows 10. This issue resides in the win32k.sys driver which manages user interface components and system-level graphics operations, making it a prime target for attackers seeking elevated system privileges. The vulnerability operates through a crafted application that exploits memory corruption within the kernel-mode driver, allowing local users to execute code with system-level privileges rather than remaining as standard user accounts.
The technical nature of this vulnerability stems from improper validation of user-supplied data within the win32k.sys driver, which is responsible for handling window management and graphics operations in the Windows kernel. When a malicious application interacts with the driver through specific API calls, it can trigger a memory corruption condition that leads to arbitrary code execution in kernel space. This flaw is categorized under CWE-121 as heap-based buffer overflow, where insufficient bounds checking allows attackers to overwrite adjacent memory locations and potentially manipulate execution flow. The vulnerability operates at the kernel level, meaning that successful exploitation bypasses standard user-mode protections and allows attackers to gain SYSTEM-level privileges without requiring physical access or additional attack vectors.
The operational impact of CVE-2016-3286 is significant as it enables local privilege escalation attacks that can be executed by any user with access to the system, making it particularly dangerous in multi-user environments or when combined with other attack vectors. Attackers can leverage this vulnerability to install persistent backdoors, modify system files, disable security features, or escalate their privileges to full administrative control. The vulnerability affects both desktop and server operating systems, making it relevant across enterprise environments where Windows systems are prevalent. According to the ATT&CK framework, this vulnerability maps to privilege escalation techniques under the T1068 category, specifically targeting the exploitation of kernel-mode vulnerabilities to achieve system-level access.
Mitigation strategies for CVE-2016-3286 primarily involve applying the Microsoft security patches released as part of the July 2016 security updates, which address the underlying kernel-mode driver issues. Organizations should prioritize patch deployment across all affected Windows versions, particularly in environments where local user access is possible or where the systems are exposed to potential attackers. Additionally, implementing security measures such as disabling unnecessary user access, monitoring for suspicious API calls, and employing kernel-mode exploit detection tools can provide defense-in-depth. System administrators should also consider implementing application whitelisting policies and reducing the attack surface by disabling unnecessary services and features that might interact with the vulnerable win32k.sys driver. The vulnerability's classification as a kernel-mode privilege escalation issue makes it particularly important to maintain up-to-date security patches and to conduct regular security assessments of Windows systems to identify and remediate similar vulnerabilities.