Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability
Prioritize patching. It under exploitation confirmed by CISA and has a public proof of concept.
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
A flaw in Windows' network support driver allows someone with basic access to gain admin-level control on a computer. The problem happens because the driver improperly manages memory, letting attackers exploit freed memory to run malicious code with higher privileges.
Use-after-free vulnerability in the Windows Ancillary Function Driver for WinSock (CWE-416) enables local privilege escalation. An authenticated attacker can trigger the freed memory condition to execute arbitrary code in kernel context, bypassing access controls.