Vulnerability 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
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Openpolicyagent | Gatekeeper | <= 3.7.0 |
Related Weaknesses (CWE)
References
- https://github.com/hkerma/opa-gatekeeper-concurrency-issueThird Party Advisory
- https://github.com/open-policy-agent/gatekeeper/releasesPatchThird Party Advisory
- https://github.com/hkerma/opa-gatekeeper-concurrency-issueThird Party Advisory
- https://github.com/open-policy-agent/gatekeeper/releasesPatchThird Party Advisory
FAQ
What is CVE-2021-43979?
CVE-2021-43979 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 ...
How severe is CVE-2021-43979?
CVE-2021-43979 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-43979?
Check the references section above for vendor advisories and patch information. Affected products include: Openpolicyagent Gatekeeper.