CVE-2020-5384 in MFA Agent
Summary
by MITRE
Authentication Bypass Vulnerability RSA MFA Agent 2.0 for Microsoft Windows contains an Authentication Bypass vulnerability. A local unauthenticated attacker could potentially exploit this vulnerability by using an alternate path to bypass authentication in order to gain full access to the system.
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Analysis
by VulDB Data Team • 11/06/2020
The RSA MFA Agent 2.0 for Microsoft Windows represents a critical security vulnerability classified as CVE-2020-5384, which manifests as an authentication bypass flaw that fundamentally undermines the security posture of systems relying on multi-factor authentication. This vulnerability specifically targets the authentication mechanisms within the RSA MFA Agent software, creating a pathway for malicious actors to circumvent the intended security controls that should prevent unauthorized access to protected systems. The flaw exists in the agent's implementation of authentication logic, allowing attackers to exploit alternate authentication paths that bypass the standard multi-factor verification processes.
The technical nature of this vulnerability stems from improper handling of authentication states and potential race conditions within the agent's authentication flow. An attacker with local access to a system running the RSA MFA Agent 2.0 can exploit this weakness to gain full system access without providing valid authentication credentials. The vulnerability's impact extends beyond simple credential theft, as it allows for complete system compromise through the bypass of the multi-factor authentication layer that should serve as a critical security barrier. This represents a significant deviation from the expected security model where multiple authentication factors should be required for system access, effectively nullifying the security benefits of multi-factor authentication.
From an operational perspective, this vulnerability creates a substantial risk for organizations that depend on RSA MFA Agent 2.0 for their Windows environments, as it provides a direct path to system compromise without requiring authentication credentials. The local nature of the attack means that an attacker would need physical or network access to the target system, but once achieved, the vulnerability allows for complete system takeover. This attack vector aligns with the attack pattern described in the MITRE ATT&CK framework under credential access and privilege escalation techniques, where adversaries seek to bypass authentication mechanisms to gain elevated system access. The vulnerability also relates to CWE-287, which addresses improper authentication issues, and CWE-305, which covers authentication bypass through multiple factors.
Organizations affected by this vulnerability should implement immediate mitigations including applying the vendor-provided security patches, implementing additional access controls, and monitoring for suspicious authentication patterns. The recommended approach involves disabling unnecessary authentication paths, reviewing system access controls, and implementing network segmentation to limit potential attack vectors. Security teams should also conduct comprehensive vulnerability assessments to identify systems running the affected RSA MFA Agent 2.0 version and ensure proper patch management procedures are in place. Additionally, organizations should consider implementing alternative authentication mechanisms or additional security layers to compensate for the vulnerability while awaiting permanent remediation, as the flaw fundamentally undermines the multi-factor authentication security model that organizations rely upon for protection against unauthorized access.