Vulnerability Description
Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Prior to versions 1.11.15, 1.12.8, and 1.13.1, an attacker with access to a Cilium agent pod can write to `/opt/cni/bin` due to a `hostPath` mount of that directory in the agent pod. By replacing the CNI binary with their own malicious binary and waiting for the creation of a new pod on the node, the attacker can gain access to the underlying node. The issue has been fixed and the fix is available on versions 1.11.15, 1.12.8, and 1.13.1. Some workarounds are available. Kubernetes RBAC should be used to deny users and service accounts `exec` access to Cilium agent pods. In cases where a user requires `exec` access to Cilium agent pods, but should not have access to the underlying node, no workaround is possible.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Cilium | Cilium | < 1.11.15 |
Related Weaknesses (CWE)
References
- https://github.com/cilium/cilium/pull/24075Third Party Advisory
- https://github.com/cilium/cilium/releases/tag/v1.11.15Third Party Advisory
- https://github.com/cilium/cilium/releases/tag/v1.12.8Third Party Advisory
- https://github.com/cilium/cilium/releases/tag/v1.13.1Third Party Advisory
- https://github.com/cilium/cilium/security/advisories/GHSA-4hc4-pgfx-3mrxThird Party Advisory
- https://kubernetes.io/docs/reference/access-authn-authz/rbac/Third Party Advisory
- https://github.com/cilium/cilium/pull/24075Third Party Advisory
- https://github.com/cilium/cilium/releases/tag/v1.11.15Third Party Advisory
- https://github.com/cilium/cilium/releases/tag/v1.12.8Third Party Advisory
- https://github.com/cilium/cilium/releases/tag/v1.13.1Third Party Advisory
- https://github.com/cilium/cilium/security/advisories/GHSA-4hc4-pgfx-3mrxThird Party Advisory
- https://kubernetes.io/docs/reference/access-authn-authz/rbac/Third Party Advisory
FAQ
What is CVE-2023-27593?
CVE-2023-27593 is a vulnerability with a CVSS score of 4.4 (MEDIUM). Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Prior to versions 1.11.15, 1.12.8, and 1.13.1, an attacker with access to a Cilium agent pod can write to `/o...
How severe is CVE-2023-27593?
CVE-2023-27593 has been rated MEDIUM with a CVSS base score of 4.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-27593?
Check the references section above for vendor advisories and patch information. Affected products include: Cilium Cilium.