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.

bash

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