Vulnerability · Published Nov 17, 2021 · Assigned by mitre
CVE-2021-43979
Medium 5.3
In plain English
A medium-severity security flaw in the affected software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 64% of all known vulnerabilities).
Official description
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
Affected products (as reported)
References
- https://github.com/hkerma/opa-gatekeeper-concurrency-issue x_refsource_MISC
- https://github.com/open-policy-agent/gatekeeper/releases x_refsource_MISC