CVE-2025-32709: Windows 10 1507 Privilege Escalation Flaw

CVE-2025-32709 Overview

Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Critical Impact
This vulnerability permits local privilege escalation, allowing attackers to execute arbitrary code with elevated permissions.

Affected Products

Microsoft Windows 10 1507
Microsoft Windows 11 22H2
Microsoft Windows Server 2019

Discovery Timeline

2025-05-13 - CVE-2025-32709 published to NVD
2025-10-27 - Last updated in NVD database

Technical Details for CVE-2025-32709

Vulnerability Analysis

This vulnerability arises from a use-after-free condition in the Windows Ancillary Function Driver. Improper handling of references allows attackers to exploit the Driver, leading to arbitrary code execution with elevated privileges.

Root Cause

The root cause is a failure to properly manage memory, specifically the premature freeing of memory in a process where the Ancillary Function Driver for WinSock is involved.

Attack Vector

The attack vector is local. An authenticated user can exploit this vulnerability, requiring minimal access to the system to succeed.

// Example exploitation code (sanitized)
#include <stdio.h>
#include <stdlib.h>

void trigger_vulnerability() {
    // Code to trigger use-after-free
    int *ptr = (int *)malloc(sizeof(int));
    free(ptr);
    // Exploit code here
    *ptr = 42; // Undefined behavior
}

int main() {
    trigger_vulnerability();
    return 0;
}

Detection Methods for CVE-2025-32709

Indicators of Compromise

Unexpected elevation of privileges
Anomalous process activity
Memory access violations logged

Detection Strategies

Utilize behavioral detection to monitor for unauthorized privilege escalation attempts and unusual memory operations related to the Ancillary Function Driver.

Monitoring Recommendations

Implement continuous system monitoring using Security Information and Event Management (SIEM) solutions to detect signs of exploitation, such as elevation of privileges and exploitation of known vulnerabilities.

How to Mitigate CVE-2025-32709

Immediate Actions Required

Apply the latest security patch provided by Microsoft
Limit local access for non-admin users
Implement application whitelisting to prevent unauthorized code execution

Patch Information

Patches for affected Windows versions are available from Microsoft’s security advisory.

Workarounds

If applying the patch immediately is not possible, restrict execution of suspicious drivers and ensure robust access control policies are in place to limit the ability to write and execute code.

bash

# Configuration example
# Restrict execution rights in Windows
icacls "C:\Path\To\Executable" /deny Everyone:(RX)