CVE-2023-44981

Published: 11 October 2023

Authorization Bypass Through User-Controlled Key vulnerability in Apache ZooKeeper. If SASL Quorum Peer authentication is enabled in ZooKeeper (quorum.auth.enableSasl=true), the authorization is done by verifying that the instance part in SASL authentication ID is listed in zoo.cfg server list. The instance part in SASL auth ID is optional and if it's missing, like 'eve@EXAMPLE.COM', the authorization check will be skipped. As a result an arbitrary endpoint could join the cluster and begin propagating counterfeit changes to the leader, essentially giving it complete read-write access to the data tree. Quorum Peer authentication is not enabled by default. Users are recommended to upgrade to version 3.9.1, 3.8.3, 3.7.2, which fixes the issue. Alternately ensure the ensemble election/quorum communication is protected by a firewall as this will mitigate the issue. See the documentation for more details on correct cluster administration.

Priority

Cvss 3 Severity Score

9.1

Score breakdown

Status

Package	Release	Status
zookeeper Launchpad, Ubuntu, Debian	bionic	Released (3.4.13-3ubuntu0.1~esm1) Available with Ubuntu Pro
	focal	Released (3.4.13-5ubuntu0.1)
	jammy	Released (3.4.13-6ubuntu4.1)
	lunar	Released (3.8.0-10ubuntu0.1)
	mantic	Released (3.8.0-11ubuntu0.1)
	trusty	Not vulnerable (code not present)
	upstream	Released (3.7.2, 3.8.3, 3.9.1)
	xenial	Not vulnerable (code not present)

Severity score breakdown

Parameter	Value
Base score	9.1
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

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