CVE-2025-24985 in Windows
Summary
by MITRE • 03/11/2025
Integer overflow or wraparound in Windows Fast FAT Driver allows an unauthorized attacker to execute code locally.
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Analysis
by VulDB Data Team • 03/17/2025
The vulnerability identified as CVE-2025-24985 represents a critical integer overflow condition within the Windows Fast FAT Driver component that operates at the kernel level. This flaw exists in the file system handling mechanisms of Microsoft Windows operating systems, specifically affecting the Fast FAT driver which is responsible for managing file allocation table operations on storage devices. The vulnerability manifests when the driver processes certain file system operations that involve integer calculations, where the arithmetic operations exceed the maximum representable value for the data type used, causing the value to wrap around to a much smaller number. This type of vulnerability falls under the Common Weakness Enumeration category CWE-190, which specifically addresses integer overflow conditions that can lead to unpredictable behavior and potential code execution. The Fast FAT driver is designed to optimize file system operations for removable storage devices, particularly those using the FAT file system format, making it a critical component in the Windows storage stack.
The technical exploitation of this vulnerability requires an attacker to have local access to the system, as the flaw does not permit remote code execution. However, the impact remains severe because the vulnerability occurs within kernel-mode code, meaning that successful exploitation could result in complete system compromise. When the integer overflow occurs during file system operations such as file creation, modification, or deletion, the corrupted integer values can lead to memory corruption, buffer overflows, or other memory management issues within the driver. The attacker would typically need to craft specific file system operations that trigger the overflow condition, potentially through malicious file creation or manipulation of file system metadata. This type of vulnerability is particularly dangerous because it operates at the kernel level where privilege escalation is not required to achieve system-level access. The ATT&CK framework categorizes this as a privilege escalation technique under the T1068 category, where attackers leverage kernel-level vulnerabilities to gain elevated privileges.
The operational impact of CVE-2025-24985 extends beyond immediate code execution capabilities as it represents a fundamental flaw in the Windows file system handling infrastructure. Systems running affected Windows versions are vulnerable to local code execution attacks that could allow attackers to install malware, modify system files, or establish persistence mechanisms. The vulnerability affects various Windows operating systems including Windows 10, Windows 11, and potentially server versions that utilize the Fast FAT driver component. Organizations with removable storage devices, external drives, or systems that frequently handle FAT-formatted media are particularly at risk, as these are the primary environments where the vulnerable driver components are actively utilized. The attack surface is further expanded in enterprise environments where users may have local access to systems through legitimate business processes, potentially enabling attackers to leverage this vulnerability through social engineering or insider threats. Security professionals must consider that this vulnerability could be exploited as part of a broader attack chain, where initial access is gained through other means and this vulnerability is used to escalate privileges or maintain persistence within the compromised system.
Mitigation strategies for CVE-2025-24985 should focus on both immediate patch management and operational security measures. Microsoft has released security updates addressing this vulnerability, and organizations should prioritize applying these patches to all affected systems. In environments where patching cannot be immediately implemented, administrators should consider disabling unnecessary file system operations that might trigger the vulnerable code paths, particularly those involving removable storage devices or external media. Network segmentation and access controls should be reinforced to limit local access to systems, as the vulnerability requires local execution privileges to be exploited. Additionally, monitoring systems should be configured to detect unusual file system activities or patterns that might indicate exploitation attempts. The vulnerability highlights the importance of kernel-level security testing and the need for robust input validation in system drivers. Organizations should implement regular security assessments of their Windows environments, focusing on kernel-mode components and driver security. Security teams should also consider implementing endpoint detection and response solutions that can monitor for anomalous behavior in file system operations, as these could serve as indicators of exploitation attempts. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date security patches and the potential consequences of unpatched kernel-level vulnerabilities in enterprise environments.