CVE-2017-5637

Publication date 10 October 2017

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

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.

From the Ubuntu Security Team

It was discovered that Apache ZooKeeper incorrectly implemented "wchp/wchc" commands. An attacker could possibly use this issue to cause a denial of service.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
zookeeper	22.04 LTS jammy	Not affected
	21.10 impish	Not affected
	21.04 hirsute	Not affected
	20.10 groovy	Not affected
	20.04 LTS focal	Not affected
	19.10 eoan	Not affected
	19.04 disco	Not affected
	18.10 cosmic	Not affected
	18.04 LTS bionic	Not affected
	17.10 artful	Ignored end of life
	17.04 zesty	Ignored end of life
	16.10 yakkety	Ignored end of life
	16.04 LTS xenial	Fixed 3.4.8-1ubuntu0.1~esm1 Ubuntu Pro
	14.04 LTS trusty	Fixed 3.4.5+dfsg-1ubuntu0.1~esm1 Ubuntu Pro

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Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-4789-1
Apache ZooKeeper vulnerabilities
15 March 2021