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  1. ZooKeeper
  2. ZOOKEEPER-2693

DOS attack on wchp/wchc four letter words (4lw)

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      Description

      The wchp/wchc four letter words can be exploited in a DOS attack on the ZK client port - typically 2181. The following POC attack was recently published on the web:

      https://vulners.com/exploitdb/EDB-ID:41277

      The most straightforward way to block this attack is to not allow access to the client port to non-trusted clients - i.e. firewall the ZooKeeper service and only allow access to trusted applications using it for coordination.

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              • Assignee:
                hanm Michael Han
                Reporter:
                phunt Patrick Hunt
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