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https://issues.apache.org/jira/browse/ZOOKEEPER-2693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15870287#comment-15870287
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ASF GitHub Bot commented on ZOOKEEPER-2693:
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Github user hanm commented on a diff in the pull request:
https://github.com/apache/zookeeper/pull/179#discussion_r101572954
--- Diff: src/docs/src/documentation/content/xdocs/zookeeperAdmin.xml ---
@@ -1650,7 +1674,16 @@ server.3=zoo3:2888:3888</programlisting>
while "srvr" and "cons" give extended details on server and
connections respectively.</para>
- <variablelist>
+ <para><emphasis role="bold">New in 3.5.3:</emphasis>
+ Four Letter Words need to be explicitly white listed before
using.
+ Please refer <emphasis
role="bold">4lw.commands.whitelist</emphasis>
+ described in <ulink url="#sc_clusterOptions">
+ cluster configuration section</ulink> for details.
+ Moving forward, Four Letter Words will be deprecated, please use
--- End diff --
Will do.
> 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
>
>
> 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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