KNOWLEDGE BASE

Apache Zookeeper-Default node accessible without ACL


Published: 07 May 2020
Last Modified Date: 01 Oct 2020

Issue

Qualys security scanning software flagged Zookeeper on Tableau Server as having vulnerability QID-38780 - "Apache Zookeeper Common/Default Nodes Accessible Without ACL".

Environment

  • Tableau Server 2020.2 and older.
  • Windows Server 

Resolution

In order to secure Tableau Server internal communications between nodes in a cluster, the cluster must be protected from external traffic using network security such as a firewall.

Tableau Server does not authenticate a new Zookeeper node when it joins a quorum, so Zookeeper ports need to be in the set of ports that are protected from external communication. The documents linked below address the hardening and configuration of those ports:

Tableau Server-Security Hardening:
https://help.tableau.com/current/server/en-us/security_harden.htm

Tableau Server-Ports:
https://help.tableau.com/current/server/en-us/ports.htm 

Cause

The Qualys vulnerability scanner flagged ZooKeeper on a Tableau Server node as "accessible without ACL".  This is remedied by ensuring that the ZooKeeper ports are not accessible from computers that are not part of the Tableau Server cluster.
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