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https://issues.apache.org/jira/browse/ZOOKEEPER-2693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15870316#comment-15870316
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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_r101576900
--- 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 --
>>This new configuration option is provided as both zoo.cfg option and
system properties so users can encode the white list in zoo.cfg and that is the
recommended approach as documented in the admin manual
Do you meant, you are supporting both options - users can either configure
the list in `zoo.cfg` or set as `system properties`? If yes, I'm OK to this
approach. But in the code I could see that server reads the value from
`System.getProperty(ZOOKEEPER_4LW_COMMANDS_WHITELIST)` and it is not reading
the value from `zoo.cfg`
> 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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