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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-2693) DOS attack on wchp/wchc four letter words (4lw)
Date Thu, 16 Feb 2017 21:05:41 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15870693#comment-15870693
] 

ASF GitHub Bot commented on ZOOKEEPER-2693:
-------------------------------------------

Github user hanm commented on the issue:

    https://github.com/apache/zookeeper/pull/179
  
    Thanks everyone for feedback. Updated pull request to address your review comments. One
change I made on latest update is to introduce an internal Java system property zookeeper.test.4lw.enabled
for tests so we don't have to copy paste the lengthy set up code for zookeeper.4lw.commands.whitelist
property and use  zookeeper.test.4lw.enabled instead providing an elegant switch. zookeeper.4lw.commands.whitelist
is still used in some tests to provide complete code coverage for new code paths introduced.
    
    All tests should be green now.


> 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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