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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 11:14:42 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15869746#comment-15869746
] 

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

Github user rakeshadr commented on a diff in the pull request:

    https://github.com/apache/zookeeper/pull/179#discussion_r101491680
  
    --- Diff: src/docs/src/documentation/content/xdocs/zookeeperAdmin.xml ---
    @@ -1155,6 +1155,30 @@ server.3=zoo3:2888:3888</programlisting>
                 </listitem>
               </varlistentry>
     
    +          <varlistentry>
    +            <term>4lw.commands.whitelist</term>
    +
    +            <listitem>
    +              <para>(Java system property: <emphasis
    --- End diff --
    
    Could we stop making `Java system property` for configurations. There are nearly `17 4lwords`
now and this list may grow in future. It would be easy for the users to configure comma separated
values in `zoo.cfg` rather than passing via command line options, right?


> 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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