CVE-2020-9482 in NiFi Registry
Summary
by MITRE
If NiFi Registry 0.1.0 to 0.5.0 uses an authentication mechanism other than PKI, when the user clicks Log Out, NiFi Registry invalidates the authentication token on the client side but not on the server side. This permits the user's client-side token to be used for up to 12 hours after logging out to make API requests to NiFi Registry.
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Analysis
by VulDB Data Team • 10/14/2020
The vulnerability identified as CVE-2020-9482 affects Apache NiFi Registry versions 0.1.0 through 0.5.0 and represents a critical session management flaw that undermines the security of authentication mechanisms. This issue specifically impacts systems that utilize authentication methods other than Public Key Infrastructure PKI, creating a persistent security weakness that allows unauthorized access through replay attacks. The flaw stems from an improper implementation of session termination protocols where the server fails to invalidate the authentication token on the backend system, while only removing it from the client-side session storage.
The technical nature of this vulnerability aligns with CWE-613, which addresses insufficient session expiration, and demonstrates a clear failure in the principle of least privilege during user logout operations. When users navigate to the logout functionality, the system correctly removes the token from the client browser or application cache, but the server-side token validation remains active for up to twelve hours. This creates a window of opportunity where an attacker who has obtained a valid session token can continue making authenticated API requests without re-authentication, effectively bypassing the intended logout mechanism.
The operational impact of this vulnerability extends beyond simple session hijacking, as it enables prolonged unauthorized access to NiFi Registry's administrative and data management functions. Attackers can leverage this weakness to perform unauthorized data modifications, access sensitive configuration information, or execute malicious operations within the registry environment. The twelve-hour window provides ample time for attackers to conduct reconnaissance, escalate privileges, or move laterally within the system, particularly in environments where NiFi Registry serves as a central data management hub for critical infrastructure.
This vulnerability directly relates to ATT&CK technique T1566, which encompasses credential harvesting and session manipulation attacks, and also aligns with T1078, which covers legitimate credentials usage. Organizations using affected NiFi Registry versions face significant risk of unauthorized access and potential data compromise, especially when the registry manages sensitive operational data or serves as an integration point for critical business processes. The flaw essentially creates a persistent backdoor that remains active even after users believe they have securely logged out of the system.
The recommended mitigation strategy involves immediate upgrade to NiFi Registry versions that address this session management issue, along with implementing additional security controls such as shorter session timeouts, more robust token invalidation mechanisms, and monitoring for unusual API access patterns. Organizations should also consider implementing network-level controls and access logging to detect potential exploitation attempts. The fix requires proper implementation of server-side token invalidation during logout operations, ensuring that all authentication contexts are properly terminated and that the system enforces strict session lifecycle management according to established security best practices and compliance requirements.