CVE-2016-0007 in Windows
Summary
by MITRE
The sandbox implementation in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT Gold and 8.1, and Windows 10 Gold and 1511 mishandles reparse points, which allows local users to gain privileges via a crafted application, aka "Windows Mount Point Elevation of Privilege Vulnerability," a different vulnerability than CVE-2016-0006.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 05/07/2025
The Windows Mount Point Elevation of Privilege Vulnerability represents a critical sandboxing flaw in Microsoft operating systems that affects multiple versions including Windows Vista SP2 through Windows 10 version 1511. This vulnerability specifically targets the kernel-mode component responsible for handling reparse points, which are filesystem features that allow transparent redirection of file system requests to different locations. The flaw exists in how the operating system processes these reparse point operations within its sandboxing mechanisms, creating a pathway for privilege escalation that bypasses normal security boundaries.
The technical implementation of this vulnerability stems from improper handling of reparse points during the sandbox validation process. When applications attempt to create or manipulate reparse points within restricted environments, the system fails to properly validate the security context of these operations. This misimplementation allows malicious applications to craft specific reparse point configurations that can be exploited to elevate privileges from standard user level to system level access. The vulnerability operates through a sophisticated manipulation of the filesystem's reparse point handling code, specifically targeting the Windows Object Manager's interaction with symbolic links and mount points.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with complete system compromise capabilities. Local users who can execute crafted applications gain the ability to perform actions that would normally require administrative privileges, including modifying system files, installing malicious software, and accessing sensitive data. The vulnerability's persistence across multiple Windows versions indicates a fundamental flaw in the operating system's security architecture that affects both desktop and server environments. Attackers can leverage this vulnerability to establish persistent backdoors, modify system configurations, and potentially move laterally within network environments where the compromised system resides.
Mitigation strategies for this vulnerability require immediate patch application through Microsoft's security updates, as the flaw has been addressed in subsequent security releases. Organizations should implement comprehensive monitoring of reparse point creation activities and establish strict controls over user application execution. The vulnerability aligns with ATT&CK technique T1068, which covers "Exploitation for Privilege Escalation," and maps to CWE-264, "Permissions, Privileges, and Access Controls," highlighting the fundamental security control failure in the operating system's privilege management. System administrators should also consider implementing additional security controls such as application whitelisting, mandatory access controls, and regular security assessments to prevent exploitation of similar sandboxing vulnerabilities. The vulnerability demonstrates the critical importance of proper filesystem reparse point validation in security-critical operating system components and underscores the need for robust sandboxing implementations that properly enforce security boundaries.