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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 Fri, 03 Mar 2017 06:38:45 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15893820#comment-15893820
] 

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

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

    https://github.com/apache/zookeeper/pull/179#discussion_r104096586
  
    --- Diff: src/java/test/org/apache/zookeeper/ZKTestCase.java ---
    @@ -51,6 +51,12 @@ public void starting(FrameworkMethod method) {
                 // accidentally attempting to start multiple admin servers on the
                 // same port.
                 System.setProperty("zookeeper.admin.enableServer", "false");
    +            // ZOOKEEPER-2693 disables all 4lw by default.
    +            // Here we enable the 4lw which ZooKeeper tests depends.
    +            System.setProperty("zookeeper.4lw.commands.whitelist",
    +                    "ruok, envi, conf, stat, srvr, cons, dump," +
    --- End diff --
    
    Yeah I thought about this but I ended up keeping the current form to get more test coverage.



> 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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