Patrick Hunt created ZOOKEEPER-2693:
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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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