CVE-2025-29824: Windows 10 1507 Privilege Escalation Flaw

CVE-2025-29824 Overview

Use after free in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally. Affected systems are susceptible to local privilege escalation, potentially compromising sensitive data and system integrity.

Critical Impact

This vulnerability enables attackers to gain elevated privileges on affected systems, posing a significant security risk.

Affected Products

• Microsoft Windows 10 1507
• Microsoft Windows 10 1607
• Microsoft Windows 10 1809
• Microsoft Windows 11 22H2
• Microsoft Windows Server 2025

Discovery Timeline

• Not Available - Vulnerability discovered by Not Available
• Not Available - Responsible disclosure to Microsoft
• Not Available - CVE CVE-2025-29824 assigned
• Not Available - Microsoft releases security patch
• 2025-04-08 - CVE CVE-2025-29824 published to NVD
• 2025-10-27 - Last updated in NVD database

Technical Details for CVE-2025-29824

Vulnerability Analysis

The vulnerability stems from a use after free condition in the Windows Common Log File System Driver. This allows attackers to execute arbitrary code or gain elevated privileges.

Root Cause

The issue is caused by improper handling of memory objects, which leads to a use after free condition in the clfs.sys driver.

Attack Vector

Local access is required to exploit this vulnerability. An attacker with authenticated access can exploit the vulnerability to escalate privileges.

#include <windows.h>

// Example exploitation code (partial, sanitized)
void main() {
    HANDLE hFile = CreateFile("\\.\C:\example.txt", GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    // Perform operations that lead to use after free
    CloseHandle(hFile);
    // Potential malicious code execution
}

Detection Methods for CVE-2025-29824

Indicators of Compromise

• Unusual process executions
• Unexpected file modifications
• Anomalous access patterns to clfs.sys

Detection Strategies

Utilize behavior analytics to identify unusual access patterns and file operations. Leverage endpoint detection and response (EDR) systems to monitor for exploit attempts involving clfs.sys.

Monitoring Recommendations

• Monitor for suspicious privilege elevation attempts
• Use audit logs to track unauthorized access
• Regularly inspect system calls and file-access patterns

How to Mitigate CVE-2025-29824

Immediate Actions Required

• Apply official patches from Microsoft immediately
• Restrict access to systems where feasible
• Monitor and analyze security logs for indicators of compromise

Patch Information

Visit the Microsoft Security Response Center advisory for patch downloads and detailed information.

Workarounds

Consider disabling the Windows Common Log File System temporarily if applicable.

# Disable CLFS driver via PowerShell
Get-Service -Name "clfs" | Stop-Service -Force
Set-Service -Name "clfs" -StartupType Disabled