CVE-2020-17090 in Windows
Summary
by MITRE • 11/11/2020
Microsoft Defender for Endpoint Security Feature Bypass Vulnerability
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Analysis
by VulDB Data Team • 12/05/2020
Microsoft Defender for Endpoint contains a security feature bypass vulnerability that allows attackers to circumvent critical protection mechanisms designed to prevent unauthorized access and malicious code execution. This vulnerability affects the behavior of Microsoft Defender's real-time protection and automated investigation features, potentially enabling adversaries to execute malicious payloads without detection. The flaw stems from improper validation of security policies and insufficient enforcement of access controls within the endpoint protection framework.
The technical implementation of this vulnerability resides in how Microsoft Defender for Endpoint processes and validates security configurations during runtime operations. Attackers can exploit this weakness by manipulating specific parameters within the security feature configuration, effectively disabling or bypassing key protection layers. The vulnerability specifically impacts the way the system handles privilege escalation scenarios and access control enforcement, allowing unauthorized code execution that would normally be blocked by the security platform. This bypass mechanism operates at the kernel level, where Microsoft Defender's security features interact with the operating system's core protection mechanisms, making it particularly dangerous for enterprise environments.
The operational impact of CVE-2020-17090 extends beyond simple privilege escalation, as it enables sophisticated attack chains that can lead to complete system compromise. Security teams face significant challenges in detecting malicious activities since the vulnerability allows adversaries to operate within the environment without triggering standard detection mechanisms. The bypass affects critical security controls including exploit protection, behavior monitoring, and automated threat investigation features that are fundamental to Microsoft Defender for Endpoint's protection capabilities. Organizations using this security platform experience a reduced attack surface protection level, with attackers able to deploy malware, establish persistence mechanisms, and exfiltrate sensitive data without detection.
Mitigation strategies for this vulnerability require immediate implementation of Microsoft security patches and updates to the Defender for Endpoint platform. Organizations should also implement additional monitoring controls to detect anomalous behavior patterns that may indicate exploitation attempts. The security community recommends configuring strict access controls and implementing network segmentation to limit the potential impact of successful exploitation attempts. This vulnerability aligns with CWE-284 Access Control Issues and maps to ATT&CK technique T1068, which involves privilege escalation through local system access. Security professionals should conduct comprehensive vulnerability assessments to identify systems running vulnerable versions of Microsoft Defender for Endpoint and ensure all endpoints are updated with the latest security patches. The affected systems require immediate remediation through official Microsoft update channels and should undergo security configuration reviews to prevent exploitation attempts.