[
https://issues.apache.org/jira/browse/ZOOKEEPER-2693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15895811#comment-15895811
]
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)
