CVE-2016-7225 in Windows
Summary
by MITRE
Virtual Hard Disk Driver in Windows 10 Gold, 1511, and 1607 and Windows Server 2016 does not properly restrict access to files, which allows local users to gain privileges via a crafted application, aka "VHD Driver Elevation of Privilege Vulnerability."
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Analysis
by VulDB Data Team • 05/10/2025
The vulnerability identified as CVE-2016-7225 represents a critical elevation of privilege flaw within the Virtual Hard Disk Driver component of Microsoft Windows operating systems. This issue affects Windows 10 versions 1511 and 1607, Windows 10 Gold, and Windows Server 2016, creating a significant security risk for affected systems. The vulnerability stems from improper access controls within the VHD driver implementation, which allows local attackers to exploit file access restrictions and escalate their privileges to system level. The flaw specifically manifests when a malicious application attempts to manipulate virtual hard disk files, bypassing normal security boundaries that should prevent unauthorized access to protected system resources.
The technical root cause of this vulnerability lies in the insufficient validation and access control mechanisms implemented within the Virtual Hard Disk Driver subsystem. When processing virtual disk files, the driver fails to properly enforce security boundaries that should prevent unauthorized access to system resources or files. This weakness enables a local attacker to craft a malicious application that can manipulate virtual disk operations in ways that circumvent normal Windows security models. The vulnerability operates at the kernel level, making it particularly dangerous as it can be exploited without requiring network connectivity or user interaction. The flaw essentially allows an attacker with low-privilege access to potentially gain full system control through carefully constructed virtual disk file operations.
The operational impact of CVE-2016-7225 extends beyond simple privilege escalation, as it represents a pathway for attackers to establish persistent system-level access. Once successfully exploited, the vulnerability enables attackers to bypass standard security controls, potentially leading to complete system compromise. The local nature of the exploit means that attackers do not require network access or specialized tools beyond a crafted application, making this vulnerability particularly concerning for enterprise environments where local access might be more easily obtained. Organizations running affected Windows versions face significant risk as this flaw can be leveraged to install malware, modify system files, or establish backdoors that persist across reboots. The vulnerability's presence in both client and server operating systems means that it affects not only desktop environments but also critical server infrastructure.
Mitigation strategies for CVE-2016-7225 should prioritize immediate patching of affected systems through Microsoft's security updates, specifically addressing the VHD driver access control issues. Organizations should implement strict access controls and monitor for suspicious virtual disk file operations, particularly those involving system directories or protected resources. System administrators should consider implementing application whitelisting policies to prevent unauthorized applications from executing on affected systems. The vulnerability aligns with CWE-284 Access Control Issues, which specifically addresses improper access control mechanisms, and represents a classic example of privilege escalation through kernel-level flaws. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques and can be used to achieve initial access and persistence within compromised systems. Regular security assessments and monitoring of system logs for unusual virtual disk operations can help detect exploitation attempts, while maintaining current antivirus signatures and endpoint protection solutions provides additional defense layers against potential exploitation.