CVE-2017-5637

Description

Two four letter word commands "wchp/wchc" are CPU intensive and could cause spike of CPU utilization on Apache ZooKeeper server if abused, which leads to the server unable to serve legitimate client requests. Apache ZooKeeper thru version 3.4.9 and 3.5.2 suffer from this issue, fixed in 3.4.10, 3.5.3, and later.

Category

7.5
CVSS
Severity: High
CVSS 3.0 •
CVSS 2.0 •
EPSS 19.98% Top 5%
Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory debian.org Vendor Advisory apache.org
Affected: Apache Software Foundation Apache ZooKeeper
Published at:
Updated at:

References

Link Tags
https://lists.apache.org/thread.html/58170aeb7a681d462b7fa31cae81110cbb749d2dc83c5736a0bb8370%40%3Cdev.zookeeper.apache.org%3E mailing list
http://www.securityfocus.com/bid/98814 third party advisory vdb entry
https://access.redhat.com/errata/RHSA-2017:3355 vendor advisory
https://access.redhat.com/errata/RHSA-2017:3354 vendor advisory
https://access.redhat.com/errata/RHSA-2017:2477 vendor advisory
http://www.debian.org/security/2017/dsa-3871 third party advisory vendor advisory
https://lists.apache.org/thread.html/053d9ce4d579b02203db18545fee5e33f35f2932885459b74d1e4272%40%3Cissues.activemq.apache.org%3E mailing list
https://lists.apache.org/thread.html/bcce5a9c532b386c68dab2f6b3ce8b0cc9b950ec551766e76391caa3%40%3Ccommits.nifi.apache.org%3E mailing list
https://lists.apache.org/thread.html/rca37935d661f4689cb4119f1b3b224413b22be161b678e6e6ce0c69b%40%3Ccommits.nifi.apache.org%3E mailing list
https://www.oracle.com/security-alerts/cpujul2020.html
https://issues.apache.org/jira/browse/ZOOKEEPER-2693 vendor advisory mitigation issue tracking
https://www.oracle.com//security-alerts/cpujul2021.html

Frequently Asked Questions

What is the severity of CVE-2017-5637?
CVE-2017-5637 has been scored as a high severity vulnerability.
How to fix CVE-2017-5637?
To fix CVE-2017-5637, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-5637 being actively exploited in the wild?
It is possible that CVE-2017-5637 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~20% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2017-5637?
CVE-2017-5637 affects Apache Software Foundation Apache ZooKeeper.
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