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https://issues.apache.org/jira/browse/ZOOKEEPER-2693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15898109#comment-15898109
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ASF GitHub Bot commented on ZOOKEEPER-2693:
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GitHub user hanm opened a pull request:
https://github.com/apache/zookeeper/pull/183
ZOOKEEPER-2693: DOS attack on wchp/wchc four letter words (4lw).
Similar as pull request 179, this PR introduces new property
zookeeper.4lw.commands.whitelist to branch-3.4.
Unlike branch-3.5 where all 4lw (with few exceptions) is disabled by
default, for branch-3.4 only "wchp" and "wchc" are disabled by default - since
4lw is widely used and there is no alternatives in branch-3.4 so we just
disable the exploitable ones.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/hanm/zookeeper ZOOKEEPER-2693-br-3.4
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/zookeeper/pull/183.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #183
----
----
> 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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