CVE-2023-44981

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
zookeeper	23.10 mantic	Fixed 3.8.0-11ubuntu0.1
	23.04 lunar	Fixed 3.8.0-10ubuntu0.1
	22.04 LTS jammy	Fixed 3.4.13-6ubuntu4.1
	20.04 LTS focal	Fixed 3.4.13-5ubuntu0.1
	18.04 LTS bionic	Fixed 3.4.13-3ubuntu0.1~esm1 Ubuntu Pro
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

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Severity score breakdown

Parameter	Value
Base score	9.1 · Critical
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

Related Ubuntu Security Notices (USN)

USN-6559-1
ZooKeeper vulnerabilities
16 January 2024