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From "Patrick Hunt (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-2713) Create CVE text for ZOOKEEPER-2693 "DOS attack on wchp/wchc four letter words (4lw)"
Date Wed, 27 Sep 2017 17:39:00 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16182965#comment-16182965

Patrick Hunt commented on ZOOKEEPER-2713:

Minor changes given the release is now published.

CVE-2017-5637: DOS attack on wchp/wchc four letter words (4lw)

Severity: moderate
The Apache Software Foundation
Versions Affected:
ZooKeeper 3.4.0 to 3.4.9
ZooKeeper 3.5.0 to 3.5.2
The unsupported ZooKeeper 1.x through 3.3.x versions may be also affected
Note: The 3.5 branch is still beta at this time.

Two four letter word commands “wchp/wchc” are CPU intensive and could cause spike of CPU
utilization on ZooKeeper server if abused,
which leads to the server unable to serve legitimate client requests. There is no known compromise
which takes advantage of this vulnerability.

This affects ZooKeeper ensembles whose client port is publicly accessible, so it is recommended
to protect ZooKeeper ensemble with firewall.
Documentation has also been updated to clarify on this point. In addition, a patch (ZOOKEEPER-2693)
is provided to disable "wchp/wchc” commands
by default.
- ZooKeeper 3.4.x users should upgrade to 3.4.10 or apply the patch.
- ZooKeeper 3.5.x users should upgrade to 3.5.3 or apply the patch.

> Create CVE text for ZOOKEEPER-2693 "DOS attack on wchp/wchc four letter words (4lw)"
> ------------------------------------------------------------------------------------
>                 Key: ZOOKEEPER-2713
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2713
>             Project: ZooKeeper
>          Issue Type: Task
>          Components: security
>            Reporter: Patrick Hunt
>            Priority: Blocker
>             Fix For: 3.5.4, 3.6.0, 3.4.11
> We need to agree to the CVE text for ZOOKEEPER-2693. Let's use the comments here to do
> The assigned CVE number is CVE-2017-5637

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