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From "Patrick Hunt (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ZOOKEEPER-2693) DOS attack on wchp/wchc four letter words (4lw)
Date Tue, 14 Feb 2017 03:33:41 GMT
Patrick Hunt created ZOOKEEPER-2693:
---------------------------------------

             Summary: DOS attack on wchp/wchc four letter words (4lw)
                 Key: ZOOKEEPER-2693
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2693
             Project: ZooKeeper
          Issue Type: Bug
          Components: security, server
    Affects Versions: 3.4.0
            Reporter: Patrick Hunt
            Priority: Blocker
             Fix For: 3.4.10, 3.5.3


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://webcache.googleusercontent.com/search?q=cache:_CNGIz10PRYJ:https://www.exploit-db.com/exploits/41277/+&cd=14&hl=en&ct=clnk&gl=us

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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