CVE-2020-0704 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists when the Windows Wireless Network Manager improperly handles memory.To exploit this vulnerability, an attacker would first have to gain execution on the victim system, aka 'Windows Wireless Network Manager Elevation of Privilege Vulnerability'.
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Analysis
by VulDB Data Team • 03/29/2024
The CVE-2020-0704 vulnerability represents a critical elevation of privilege flaw within the Windows Wireless Network Manager component that stems from improper memory handling practices. This vulnerability resides in the Windows operating system's wireless networking stack and specifically affects the WlanSvc service responsible for managing wireless network connections. The flaw manifests when the system processes certain memory operations related to wireless network configuration and authentication, creating a pathway for malicious code execution that can escalate privileges from standard user level to SYSTEM level access. The vulnerability is particularly concerning because it requires only local execution on the target system, meaning an attacker who has already achieved initial access through other means can leverage this flaw to gain full system control. This represents a classic post-exploitation escalation technique that aligns with the ATT&CK framework's privilege escalation tactics, specifically targeting the 'Windows Services' and 'Exploitation for Privilege Escalation' techniques.
The technical root cause of CVE-2020-0704 can be traced to a memory corruption issue within the Windows Wireless Network Manager service implementation. When processing wireless network configuration data, particularly during authentication and connection establishment phases, the system fails to properly validate memory boundaries and handle buffer operations correctly. This improper memory management creates opportunities for heap-based buffer overflows or use-after-free conditions that can be exploited by malicious code to overwrite critical system memory locations. The vulnerability is classified under CWE-121 as a stack-based buffer overflow, though the actual implementation likely involves heap corruption due to the nature of the wireless networking service architecture. The flaw occurs in the interaction between the user-mode wireless service and kernel-mode components, where insufficient input validation allows attackers to manipulate memory structures that control network authentication processes. The Windows kernel's memory management subsystem fails to properly enforce memory access controls during these specific operations, creating a window where malicious payloads can be injected and executed with elevated privileges.
The operational impact of this vulnerability extends far beyond simple privilege escalation, as it provides attackers with complete system compromise capabilities that align with the ATT&CK framework's 'System Owner/User' and 'Privilege Escalation' domains. Once an attacker achieves local execution through any initial compromise vector, they can leverage CVE-2020-0704 to gain SYSTEM-level access without requiring additional authentication or complex attack chains. This makes the vulnerability particularly dangerous in enterprise environments where wireless networks are extensively used and where attackers may have already established a foothold through phishing, exploit kits, or other initial access methods. The vulnerability affects multiple Windows versions including Windows 10 versions 1903 and 1909, Windows Server 2019, and Windows Server 2016, making it a widespread concern across modern Windows deployments. The exploitation requires minimal privileges and can be automated, making it attractive for both advanced persistent threat actors and automated malware campaigns. The impact is further amplified by the fact that wireless network management services are typically running with elevated privileges and are frequently accessed during normal system operation, providing consistent attack surfaces for exploitation.
Mitigation strategies for CVE-2020-0704 must address both immediate patching requirements and operational security improvements to protect against exploitation attempts. Microsoft released security updates in May 2020 that addressed the memory handling issues in the Windows Wireless Network Manager service, and organizations should prioritize immediate deployment of these patches across all affected systems. The vulnerability is particularly dangerous because it requires only local execution, meaning organizations should focus on preventing initial compromise through network segmentation, endpoint protection, and user access controls. Security teams should implement monitoring for unusual wireless network activity and service restarts that might indicate exploitation attempts, as the vulnerability specifically targets the WlanSvc service. Additionally, organizations should consider implementing application whitelisting policies to restrict execution of unauthorized binaries that might attempt to exploit this vulnerability. The mitigation approach should align with the MITRE ATT&CK framework's defensive strategies, focusing on patch management, service hardening, and behavioral monitoring to detect and prevent exploitation attempts. Network administrators should also review wireless network configurations to minimize the attack surface and ensure that wireless services are properly isolated from critical system components. Organizations should conduct vulnerability assessments to identify systems running affected Windows versions and prioritize remediation efforts based on risk exposure and criticality of affected systems.