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Michael Han commented on ZOOKEEPER-2693: ---------------------------------------- Thanks everyone for spending time on review / providing feedback. Committed to master: https://github.com/apache/zookeeper/commit/5fe68506f217246c7ebd96803f9c78e13ec2f11a Committed to branch-3.5: https://github.com/apache/zookeeper/commit/6d9fc04c052adbc79bbbb1c63f3f00c816fb8e56 Patch to branch-3.4 will be based on the committed patch with small tweaks, and will be created as a separate pull request. > 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, 3.5.1, 3.5.2 > Reporter: Patrick Hunt > Assignee: Michael Han > Priority: Blocker > Fix For: 3.4.10, 3.5.3 > > Attachments: ZOOKEEPER-2693-01.patch > > > 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. -- This message was sent by Atlassian JIRA (v6.3.15#6346)