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  1. ZooKeeper
  2. ZOOKEEPER-2693

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

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Blocker
    • Resolution: Fixed
    • Affects Version/s: 3.4.0, 3.5.1, 3.5.2
    • Fix Version/s: 3.4.10, 3.5.3, 3.6.0
    • Component/s: security, server
    • Labels:
      None

      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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                Dates

                • Created:
                  Updated:
                  Resolved: