CVE-2021-43979 Information

Description

DISPUTED Styra Open Policy Agent (OPA) Gatekeeper through 3.7.0 mishandles concurrency sometimes resulting in incorrect access control. The data replication mechanism allows policies to access the Kubernetes cluster state. During data replication OPA/Gatekeeper does not wait for the replication to finish before processing a request which might cause inconsistencies between the replicated resources in OPA/Gatekeeper and the resources actually present in the cluster. Inconsistency can later be reflected in a policy bypass. NOTE: the vendor disagrees that this is a vulnerability because Kubernetes states are only eventually consistent.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Reference

https://github.com/hkerma/opa-gatekeeper-concurrency-issue https://github.com/open-policy-agent/gatekeeper/releases

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

LOW

Base Score

NONE

Base Severity

5.3