CVE-2016-0151 in Windows
Summary
by MITRE
The Client-Server Run-time Subsystem (CSRSS) in Microsoft Windows 8.1, Windows Server 2012 Gold and R2, Windows RT 8.1, and Windows 10 Gold and 1511 mismanages process tokens, which allows local users to gain privileges via a crafted application, aka "Windows CSRSS Security Feature Bypass Vulnerability."
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Analysis
by VulDB Data Team • 04/23/2026
The vulnerability identified as CVE-2016-0151 resides within the Client-Server Run-time Subsystem component of Microsoft Windows operating systems, affecting versions including Windows 8.1, Windows Server 2012, Windows RT 8.1, and Windows 10. This flaw represents a critical security bypass issue that fundamentally undermines the operating system's privilege management mechanisms. The CSRSS serves as a critical subsystem responsible for managing console windows, process tokens, and other essential runtime services that facilitate communication between user-mode applications and the kernel-mode operating system components.
The technical flaw manifests through improper handling of process tokens within the CSRSS execution context, creating a scenario where local attackers can manipulate the privilege escalation process. Specifically, the vulnerability exploits how the subsystem manages access tokens during process creation and execution, allowing malicious applications to bypass normal security boundaries that should prevent unauthorized privilege elevation. This mismanagement occurs at the kernel level where process tokens are validated and enforced, creating an exploitable condition that enables attackers to elevate their privileges from standard user level to system level without proper authentication or authorization.
The operational impact of this vulnerability is severe and multifaceted, as it provides local attackers with a straightforward path to achieve system-level privileges. Attackers can leverage this vulnerability by crafting specially designed applications that exploit the token management flaw, potentially enabling them to execute arbitrary code with full administrative privileges. The implications extend beyond simple privilege escalation, as successful exploitation can lead to complete system compromise, data exfiltration, persistence mechanisms, and lateral movement within network environments. This vulnerability directly maps to CWE-276, which describes improper privileges, and aligns with ATT&CK technique T1068, which covers privilege escalation through exploitation of a software vulnerability.
Mitigation strategies for CVE-2016-0151 primarily involve applying Microsoft security updates and patches released in March 2016 as part of the Microsoft Security Bulletin MS16-034. Organizations should prioritize immediate deployment of these patches across all affected systems to remediate the vulnerability. Additionally, implementing security best practices such as restricting local user account privileges, disabling unnecessary services, and monitoring for suspicious process creation patterns can help reduce the attack surface. Network segmentation and privilege separation measures should also be enforced to limit potential damage from successful exploitation attempts. The vulnerability demonstrates the critical importance of maintaining up-to-date security patches and proper privilege management within enterprise environments, as it represents a fundamental weakness in Windows operating system security architecture that could be exploited by determined attackers.