CVE-2019-12421 Explained : Impact and Mitigation

Apache NiFi versions 1.0.0 to 1.9.2 have a vulnerability where the authentication token is not invalidated on the server side when a user logs out, allowing the client-side token to remain valid for up to 12 hours.

Understanding CVE-2019-12421

This CVE affects Apache NiFi versions 1.0.0 to 1.9.2.

What is CVE-2019-12421?

In Apache NiFi versions 1.0.0 to 1.9.2, the authentication token is not properly invalidated on the server side when a user logs out, leading to a client-side token remaining valid for up to 12 hours.

The Impact of CVE-2019-12421

This vulnerability allows users to continue making API requests to NiFi using the client-side token even after logging out, potentially leading to unauthorized access and security breaches.

Technical Details of CVE-2019-12421

Apache NiFi versions 1.0.0 to 1.9.2 are affected by this authentication issue.

Vulnerability Description

When a user logs out of NiFi, the authentication token is invalidated only on the client side, leaving the server-side token valid for up to 12 hours.

Affected Systems and Versions

Product: Apache NiFi
Versions: 1.0.0 to 1.9.2

Exploitation Mechanism

The vulnerability arises when using an authentication mechanism other than PKI, allowing the client-side token to remain active post-logout.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent exploitation of this vulnerability.

Immediate Steps to Take

Upgrade NiFi to a patched version that addresses this issue.
Implement PKI-based authentication to mitigate the risk of client-side token persistence.

Long-Term Security Practices

Regularly monitor and audit authentication mechanisms for vulnerabilities.
Educate users on secure logout practices to minimize risks.

Patching and Updates

Stay informed about security updates and patches released by Apache NiFi.
Apply patches promptly to ensure the security of the system.