CVE-2025-50170 in Windows
Summary
by MITRE • 08/12/2025
Improper handling of insufficient permissions or privileges in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 11/22/2025
The vulnerability identified as CVE-2025-50170 resides within the Windows Cloud Files Mini Filter Driver, a critical component that interfaces with the Windows kernel to manage cloud storage file operations. This driver operates at a privileged level within the operating system's kernel space, making it a prime target for privilege escalation attacks. The issue stems from inadequate validation of access permissions and privilege checks during file operation processing, creating a pathway for malicious actors to exploit the system's security controls. The vulnerability specifically manifests when the driver fails to properly enforce security boundaries between different user contexts, allowing an authenticated user with limited privileges to manipulate the driver's behavior and gain elevated system access.
Technical exploitation of this vulnerability occurs through careful manipulation of file operations that traverse the Cloud Files Mini Filter Driver. The flaw represents a classic case of insufficient privilege checking where the driver does not adequately validate whether the calling process possesses appropriate permissions for the requested operations. This weakness can be leveraged to bypass standard access control mechanisms that normally prevent non-privileged users from executing certain kernel-level operations. Attackers can construct specific file access patterns or use crafted file system calls that exploit the driver's improper handling of permission states, ultimately leading to privilege escalation from standard user to SYSTEM level access. The vulnerability operates at the kernel level, making it particularly dangerous as it can bypass traditional user-mode security controls and defenses.
The operational impact of CVE-2025-50170 extends beyond simple privilege escalation, as it represents a significant weakening of the Windows security model's foundational principles. Once an attacker achieves SYSTEM-level privileges through this vulnerability, they can execute arbitrary code with complete control over the affected system, potentially leading to full network compromise, data exfiltration, or establishment of persistent backdoors. The attack vector is particularly concerning because it requires only an authenticated user account, meaning that any user with legitimate access to the system could potentially exploit this vulnerability. This makes the threat particularly relevant in enterprise environments where user accounts may have varying levels of access but should not be able to escalate privileges without proper authorization. The vulnerability affects systems running Windows operating systems that utilize the Cloud Files Mini Filter Driver, which is commonly deployed in enterprise cloud storage solutions and hybrid environments.
Mitigation strategies for CVE-2025-50170 should focus on both immediate patching and operational security improvements. Microsoft has released security updates addressing this vulnerability, and organizations must prioritize deployment of these patches across all affected systems. In the interim period before patching, administrators should implement additional security controls such as restricting user privileges, monitoring for unusual file system activity patterns, and employing behavioral analysis tools to detect potential exploitation attempts. The vulnerability aligns with CWE-284, which addresses improper access control in software systems, and represents a clear violation of the principle of least privilege that forms the basis of secure system design. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques, specifically T1068, which involves exploiting weaknesses in the operating system to gain higher privileges. Organizations should also consider implementing network segmentation and monitoring for lateral movement attempts that might occur after successful exploitation, as the elevated privileges could enable attackers to access additional systems within the network.