CVE-2016-7216 in Windows
Summary
by MITRE
The kernel API in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, and Windows 7 SP1 mishandles permissions, which allows local users to gain privileges via a crafted application, aka "Windows Kernel Elevation of Privilege Vulnerability."
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Analysis
by VulDB Data Team • 09/23/2024
This vulnerability represents a critical privilege escalation flaw in the Windows kernel API that affects multiple operating system versions including Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, and Windows 7 SP1. The issue stems from improper permission handling within the kernel level components that govern how system resources are accessed and controlled. Attackers can exploit this weakness by crafting a malicious application that leverages the flawed permission mechanisms to elevate their privileges from standard user level to SYSTEM level access. The vulnerability falls under the category of kernel-level privilege escalation, which is particularly dangerous as it allows attackers to bypass standard security controls and gain complete administrative control over affected systems. According to CWE-264, this represents a weakness in permissions, privileges, and access controls that enables unauthorized elevation of privileges. The vulnerability is classified as a local privilege escalation issue since it requires an attacker to already have a user account on the target system to execute the malicious application, but once exploited successfully, it provides complete system compromise.
The technical implementation of this vulnerability involves the kernel API incorrectly validating access permissions when processing specific system calls or operations. When a legitimate application attempts to access kernel resources, the permission checking mechanisms fail to properly enforce security boundaries, allowing malicious code to manipulate these checks and obtain elevated privileges. The flaw occurs at the kernel level where the system's security model is supposed to enforce strict access controls but instead permits unauthorized privilege escalation. This type of vulnerability aligns with ATT&CK technique T1068 which describes the use of local privilege escalation techniques to gain SYSTEM-level access. The vulnerability is particularly concerning because it affects widely deployed operating systems and can be exploited without requiring network connectivity or external attack vectors, making it a preferred target for attackers seeking persistent access to compromised systems.
The operational impact of this vulnerability is severe and far-reaching across enterprise environments where Windows systems are prevalent. Once successfully exploited, attackers can gain complete control over affected systems, allowing them to install malware, modify system configurations, access sensitive data, and establish persistent backdoors. The vulnerability enables attackers to bypass standard security measures such as user access control, file permissions, and registry protections that normally prevent unauthorized access to critical system components. Organizations running affected versions of Windows are particularly vulnerable as this flaw can be exploited by any user with local login access, including employees, contractors, or anyone with physical access to systems. The risk is compounded by the fact that the vulnerability affects both desktop operating systems and server environments, potentially compromising entire network infrastructures. Security researchers have noted that this vulnerability can be particularly dangerous in environments where users have administrative privileges or where systems are configured with less restrictive security policies, as it provides a direct path to SYSTEM-level compromise that can be used to evade detection and maintain long-term access to target networks.
Mitigation strategies for this vulnerability include immediate deployment of Microsoft security patches and updates that address the kernel permission handling flaw. Organizations should prioritize patch management processes to ensure all affected systems receive the necessary security updates as soon as possible. System administrators should also implement additional security controls such as disabling unnecessary user accounts, implementing strict access controls, and monitoring for suspicious privilege escalation attempts. The vulnerability highlights the importance of maintaining current security patches and following security best practices for system hardening. Given that this is a kernel-level vulnerability, traditional endpoint protection solutions may not provide adequate protection, making it essential for organizations to maintain robust patch management programs and implement defense-in-depth strategies. Security teams should also consider implementing monitoring for unusual privilege elevation activities and conducting regular security assessments to identify and remediate similar vulnerabilities in their environments. The vulnerability serves as a reminder of the critical importance of timely security updates and the potential consequences of failing to maintain current security patches on widely deployed operating systems.