Latest Update: Microsoft Fixes Exploited Windows CLFS 0-day & WinRAR Rectifies MotW Bypass Flaw – Week Review
Microsoft Patches Exploited Windows CLFS 0-Day, WinRAR MotW Bypass Flaw Fixed: A Comprehensive Review
In recent cybersecurity updates, Microsoft has emerged as the savior for two major software vulnerabilities noted this week.
On this week’s Patch Tuesday, Microsoft released updates to rectify an actively exploited Windows Common Log File System(CFLS) zero-day vulnerability known as CVE-2025-29824.
In parallel, WinRAR, a popular file compression tool, also addressed a critical glitch pertaining to the Method of the Web (MotW) bypass flaw that exploits the ‘motw’ attribute in file extraction, identified as CVE-2025-31334.
Both vulnerabilities had the potential to allow malicious actors to gain unauthorized control over the victim’s system.
Microsoft’s Patches: Addressing the Windows CLFS 0-Day Exploitation
The zero-day flaw in Windows CLFS, marked as CVE-2025-29824, was under active exploitation, according to Microsoft.
It is a kernel elevation of privilege vulnerability that could let the hacker run arbitrary code in the kernel mode, thereby taking full control of the affected system.
This flaw was noted in Windows 10 versions 1909 and 2004.
Microsoft’s April 2025 Patch Tuesday promptly addressed the vulnerability through the release of security updates, providing crucial patches for affected users.
All Windows system administrators are encouraged to apply these patches and keep their systems up to date to prevent the exploitation of the vulnerability.
WinRAR’s Response: Fixing the ‘MotW’ Bypass Flaw
The Downloader’s Vulnerability, or CVE-2025-31334, could potentially lead to Windows’ Mark of the Web (MotW) being bypassed, allowing an attacker to execute harmful software unknowingly on a victim’s computer.
MotW is a security feature intended to protect users from potentially unsafe files downloaded from the internet.
Fortunately, WinRAR has released updates to address this security loophole.
As the MotW bypass vulnerability could lead to malicious codes running on a user’s computer without their knowledge, it is highly recommended that all WinRAR users update their software as soon as possible to mitigate the risks.
Conclusion
These two prominent fixes underscore the importance of regular software updates and patches.
Too often, users neglect the importance of keeping their software systems updated, leaving vulnerabilities unattended for extended periods.
Following cybersecurity best practices, such as prompt system updates and regular monitoring for unusual activities, is essential in maintaining a secure digital environment.
Follow-Up Reading
For more insights and updates in the realm of cybersecurity, consider these helpful resources:
