CVE-2021-1646 in Windows
Summary
by MITRE • 01/13/2021
Windows WLAN Service Elevation of Privilege Vulnerability
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 10/09/2024
The Windows WLAN Service Elevation of Privilege Vulnerability represents a critical security flaw in Microsoft Windows operating systems that allows local attackers to escalate their privileges from standard user level to system level. This vulnerability specifically affects the Windows Wireless LAN (WLAN) service component and has been classified under the Common Weakness Enumeration framework as CWE-269, which pertains to improper privilege management. The flaw stems from inadequate access controls within the WLAN service implementation, creating a pathway for malicious actors to exploit the service and gain elevated system privileges without proper authentication.
The technical mechanism behind this vulnerability involves the WLAN service's insufficient validation of access requests and improper handling of privilege escalation scenarios. When the Windows WLAN service processes certain API calls or service interactions, it fails to properly verify the privileges of the requesting entity. This weakness allows a local attacker with standard user credentials to manipulate the service behavior and execute malicious code with system-level privileges. The vulnerability is particularly concerning because it leverages legitimate system services that are typically trusted and running with elevated privileges, making it difficult to detect through conventional security monitoring approaches.
Operationally, this vulnerability presents significant risks to enterprise environments where multiple users share systems or where privilege separation is not properly enforced. Attackers can exploit this flaw to install persistent backdoors, modify system files, access sensitive data, or establish covert communication channels. The impact extends beyond individual system compromise to potentially enable lateral movement within networks, as attackers can use the elevated privileges to access other systems or escalate their access to administrative accounts. This vulnerability particularly affects Windows 10 and Windows Server 2016 systems, with the exploitation potential increasing when systems are not properly patched or updated. The ATT&CK framework categorizes this as a privilege escalation technique under T1068, which involves the use of system services to gain elevated privileges.
Mitigation strategies for this vulnerability require immediate implementation of Microsoft security updates and patches to address the underlying service access control issues. System administrators should ensure that all Windows systems are kept up to date with the latest security patches, particularly those addressing WLAN service components. Additional protective measures include implementing least privilege principles, disabling unnecessary WLAN services when not required, and monitoring for unusual service access patterns or privilege escalation attempts. Network segmentation and enhanced monitoring of system logs can help detect exploitation attempts. Organizations should also consider implementing application whitelisting policies to restrict execution of unauthorized code and maintain regular vulnerability assessments to identify similar privilege escalation vectors. The vulnerability highlights the importance of proper service privilege management and access control implementation in operating system components, as outlined in security standards such as the NIST Cybersecurity Framework and ISO/IEC 27001 requirements for secure system design and implementation.