CVE-2024-38143: Windows 10 1507 Privilege Escalation Flaw

CVE-2024-38143 Overview

CVE-2024-38143 is an elevation of privilege vulnerability affecting the Windows WLAN AutoConfig Service (WLANSVC). This service manages wireless network connections and profiles on Windows systems. The vulnerability allows an attacker with physical access to the system to potentially elevate their privileges and access sensitive information without requiring user interaction or prior authentication.

Critical Impact

An attacker with physical access to an affected Windows system could exploit this vulnerability to gain unauthorized access to highly confidential information by bypassing authentication mechanisms in the WLAN AutoConfig Service.

Affected Products

• Microsoft Windows 10 (versions 1507, 1607, 1809, 21H2, 22H2)
• Microsoft Windows 11 (versions 21H2, 22H2, 23H2, 24H2)
• Microsoft Windows Server 2016, 2019, 2022, and 2022 23H2

Discovery Timeline

• August 13, 2024 - CVE-2024-38143 published to NVD
• August 16, 2024 - Last updated in NVD database

Technical Details for CVE-2024-38143

Vulnerability Analysis

This elevation of privilege vulnerability exists within the Windows WLAN AutoConfig Service, which is responsible for configuring wireless network settings and managing Wi-Fi connections on Windows systems. The vulnerability stems from a missing authentication check (CWE-306: Missing Authentication for Critical Function) that allows an attacker to access protected functionality without proper authorization.

The attack requires physical access to the target system and involves high complexity to successfully exploit. While the scope remains unchanged (contained to the vulnerable component), successful exploitation could lead to significant confidentiality impact, potentially exposing sensitive wireless network credentials, stored profiles, or other confidential data managed by the WLANSVC service.

Root Cause

The vulnerability is classified under CWE-306 (Missing Authentication for Critical Function), indicating that the WLAN AutoConfig Service fails to properly authenticate requests before performing sensitive operations. This missing authentication check creates a pathway for unauthorized access to protected resources or functionality within the wireless networking subsystem.

Attack Vector

The attack vector for CVE-2024-38143 requires physical access to the vulnerable system. An attacker must be physically present at the device to initiate the exploit. While this limits the attack surface compared to network-based vulnerabilities, it poses a significant risk in scenarios involving:

• Shared workstations or kiosks
• Unattended laptops or devices in corporate environments
• Systems in publicly accessible locations
• Device theft scenarios

The high attack complexity indicates that additional conditions must be met beyond simple physical access, potentially requiring specific system states or configurations to be exploited successfully.

Detection Methods for CVE-2024-38143

Indicators of Compromise

• Unusual access patterns or events related to the WLAN AutoConfig Service (WLANSVC)
• Unexpected modifications to wireless network profiles or credentials
• Anomalous service behavior or restarts involving svchost.exe hosting WLANSVC
• Unauthorized physical access attempts or evidence of tampering

Detection Strategies

• Monitor Windows Event Logs for unusual WLAN AutoConfig Service events (Event IDs related to WLAN service operations)
• Implement endpoint detection rules targeting suspicious interactions with the WLANSVC service
• Enable auditing for wireless network profile access and modifications
• Deploy SentinelOne behavioral AI to detect privilege escalation attempts targeting Windows services

Monitoring Recommendations

• Configure alerting for physical security events in conjunction with wireless service anomalies
• Monitor for privilege escalation attempts originating from local system access
• Implement continuous monitoring of critical Windows services including WLAN AutoConfig
• Review system access logs correlating with WLAN service activity during off-hours

How to Mitigate CVE-2024-38143

Immediate Actions Required

• Apply Microsoft's security update from the August 2024 Patch Tuesday release immediately
• Restrict physical access to systems in shared or public environments
• Ensure systems are not left unattended in unsecured locations
• Review and audit wireless network profile configurations for unauthorized changes

Patch Information

Microsoft has released security updates to address this vulnerability as part of their August 2024 security updates. Administrators should apply the appropriate patch for their Windows version:

• For detailed patch information and downloads, see the Microsoft Security Update Guide for CVE-2024-38143
• Use Windows Update, WSUS, or Microsoft Update Catalog to deploy patches across affected systems
• Prioritize patching systems in environments with higher physical access risk

Workarounds

• Implement strict physical access controls to limit who can interact with affected systems
• Consider disabling the WLAN AutoConfig Service on systems that do not require wireless networking functionality
• Use BitLocker or similar full-disk encryption to protect systems from unauthorized physical access scenarios
• Implement device attestation and secure boot configurations to detect tampering

# Disable WLAN AutoConfig Service (if wireless not required)
sc config WLANSVC start= disabled
sc stop WLANSVC

# Verify service status
sc query WLANSVC