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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=15869744#comment-15869744

ASF GitHub Bot commented on ZOOKEEPER-2693:

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

    --- 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 --
    I hope, you are planning to deprecate in 3.5.x upcoming releases and may stop supporting
this in 3.6.x onwards, right? If yes, then can we create(if not yet created) a jira task to
discuss the 4lws deprecation and makes the idea more visible to all.

> 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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