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https://issues.apache.org/jira/browse/ZOOKEEPER-2693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15895828#comment-15895828
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Hudson commented on ZOOKEEPER-2693:
-----------------------------------
FAILURE: Integrated in Jenkins build ZooKeeper-trunk #3299 (See
[https://builds.apache.org/job/ZooKeeper-trunk/3299/])
ZOOKEEPER-2693: DOS attack on wchp/wchc four letter words (4lw) (hanm: rev
5fe68506f217246c7ebd96803f9c78e13ec2f11a)
* (edit) src/docs/src/documentation/content/xdocs/zookeeperAdmin.xml
* (edit) src/java/test/org/apache/zookeeper/ZKTestCase.java
* (edit) src/java/main/org/apache/zookeeper/server/NIOServerCnxn.java
* (edit) src/java/main/org/apache/zookeeper/server/NettyServerCnxn.java
* (add) src/java/main/org/apache/zookeeper/server/command/NopCommand.java
* (edit)
src/java/main/org/apache/zookeeper/server/command/FourLetterCommands.java
* (add)
src/java/test/org/apache/zookeeper/test/FourLetterWordsWhiteListTest.java
> 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.
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