CVE-2016-3311 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-2016-3308, CVE-2016-3309, and CVE-2016-3310.
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Analysis
by VulDB Data Team • 09/13/2022
The Win32k Elevation of Privilege Vulnerability represents a critical security flaw within the kernel-mode drivers of multiple Microsoft Windows operating systems including Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8.1, Windows Server 2012, Windows RT 8.1, and Windows 10 versions 1511 and 1607. This vulnerability specifically affects the win32k.sys kernel driver which manages user interface components and graphics rendering functions in the Windows operating system. The flaw enables local attackers with standard user privileges to execute malicious code with elevated system-level privileges, effectively bypassing the operating system's security controls. This vulnerability operates under the Common Weakness Enumeration identifier CWE-264, which categorizes it as a permissions weakness, specifically involving the improper handling of privilege levels within kernel-mode components. The vulnerability stems from inadequate input validation and memory management within the win32k.sys driver, allowing attackers to manipulate kernel structures through crafted applications that exploit the graphics subsystem. The attack vector requires local execution capabilities since the vulnerability exists within the kernel-mode drivers that are accessible only through legitimate user applications. This creates a significant risk as local attackers can leverage this flaw to escalate their privileges from standard user level to SYSTEM level access, which provides complete control over the affected system.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass complete system compromise and potential lateral movement within network environments. Attackers can utilize this vulnerability to install persistent backdoors, modify system files, disable security features, and establish covert communication channels without detection. The vulnerability's presence in multiple Windows versions creates widespread exposure across enterprise environments, making it particularly dangerous for organizations with mixed operating system deployments. Security researchers have classified this vulnerability under the MITRE ATT&CK framework as part of the privilege escalation tactics, specifically targeting the 'Windows Management Instrumentation' and 'Exploitation for Privilege Escalation' techniques. The vulnerability's exploitation typically involves crafting malicious applications that trigger specific code paths within the win32k.sys driver, leading to arbitrary code execution in kernel mode. This allows attackers to bypass standard security controls including user access control, integrity checks, and other kernel-level protections that normally prevent privilege escalation. The vulnerability's persistence across multiple Windows versions indicates a fundamental flaw in the kernel driver architecture that requires comprehensive system-level patches and updates to address effectively.
Mitigation strategies for this vulnerability require immediate implementation of Microsoft security updates and patches that address the specific kernel-mode driver flaw in win32k.sys. Organizations should prioritize patch management processes to ensure all affected systems receive the necessary updates as soon as they become available. System administrators should implement additional security measures including disabling unnecessary user applications that might interact with graphics subsystems, monitoring for suspicious kernel-mode activity, and applying application whitelisting policies to prevent execution of untrusted code. The vulnerability's nature makes it particularly susceptible to exploitation through social engineering attacks where attackers might trick users into executing malicious applications that trigger the privilege escalation. Network segmentation and principle of least privilege should be enforced to limit the potential impact of successful exploitation attempts. Regular security assessments and vulnerability scanning should be conducted to identify systems running vulnerable versions of Windows that may not have received the necessary patches. Additionally, organizations should consider implementing advanced threat detection mechanisms that can identify anomalous behavior patterns associated with kernel-mode privilege escalation attempts. The vulnerability's classification as a kernel-mode privilege escalation flaw means that traditional endpoint protection solutions may not be sufficient to prevent exploitation, requiring more comprehensive security architectures that include kernel-level monitoring and protection mechanisms.