CVE-2020-9491 Explained : Impact and Mitigation

Apache NiFi 1.2.0 to 1.11.4 allows the use of weak TLS protocols, impacting intracluster communication.

Understanding CVE-2020-9491

In Apache NiFi versions 1.2.0 to 1.11.4, there is a vulnerability related to the use of weak TLS protocols.

What is CVE-2020-9491?

Apache NiFi versions 1.2.0 to 1.11.4 had a security issue where certain intracluster communications supported outdated TLS versions, despite mandating TLS v1.2 for UI and API connections.

The Impact of CVE-2020-9491

The vulnerability could potentially expose sensitive data to interception or manipulation due to the continued support of TLS v1.0 or v1.1 in specific communication channels within the NiFi environment.

Technical Details of CVE-2020-9491

Apache NiFi 1.2.0 to 1.11.4 vulnerability details.

Vulnerability Description

The NiFi UI and API enforced TLS v1.2, but certain intracluster communications like cluster request replication and Site-to-Site supported weaker TLS versions, posing a security risk.

Affected Systems and Versions

Product: Apache NiFi
Versions Affected: Apache NiFi 1.2.0 to 1.11.4

Exploitation Mechanism

Attackers could potentially exploit this vulnerability by intercepting or manipulating communication channels using outdated TLS versions.

Mitigation and Prevention

Protect your systems from CVE-2020-9491.

Immediate Steps to Take

Update Apache NiFi to a patched version that addresses the TLS vulnerability.
Disable or restrict the use of TLS v1.0 and v1.1 in intracluster communications.

Long-Term Security Practices

Regularly monitor and update TLS configurations to ensure the use of secure protocols.
Implement network segmentation to limit the impact of potential breaches.

Patching and Updates

Apply security patches provided by Apache NiFi to mitigate the vulnerability and enhance system security.