Privilege Escalation in Microsoft Windows Ancillary Function Driver for WinSock (CVE-2024-38193)
What It Is — Microsoft disclosed CVE‑2024‑38193, an unspecified flaw in the Windows Ancillary Function Driver for WinSock that allows a local attacker to obtain SYSTEM privileges. The vulnerability exists on all supported Windows releases that include the driver.
Exploitability — The flaw is exploitable locally without authentication; proof‑of‑concept code has been observed in the wild. The CVSS base score is reported as 8.8 (High).
Affected Products — Microsoft Windows operating system (all supported versions that ship the Ancillary Function Driver for WinSock).
Why It Matters for Trust & Control Assurance
- Highlights the need for continuous patch‑management as a control evidence point for audit readiness.
- Underscores the importance of privileged‑account monitoring to detect unexpected SYSTEM‑level activity.
- Demonstrates that gaps in endpoint hardening can break the “least‑privilege” control objective that maps to many frameworks (e.g., NIST CSF, ISO 27001).
Recommended Actions
- Deploy Microsoft’s security update for CVE‑2024‑38193 immediately across all Windows endpoints.
- Verify patch rollout with automated inventory and configuration tools; retain evidence of compliance.
- Strengthen privileged‑access monitoring and log‑review processes to flag any unexpected SYSTEM privilege escalation.
Source: CISA KEV – CVE‑2024‑38193