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.
Metrics
Affected Vendors & Products
References
History
Tue, 25 Feb 2025 15:15:00 +0000
Type | Values Removed | Values Added |
---|---|---|
Metrics |
ssvc
|

Status: PUBLISHED
Assigner: GitHub_M
Published: 2023-03-17T19:51:16.689Z
Updated: 2025-02-25T14:53:40.623Z
Reserved: 2023-03-04T01:03:53.635Z
Link: CVE-2023-27593

Updated: 2024-08-02T12:16:35.919Z

Status : Modified
Published: 2023-03-17T20:15:13.430
Modified: 2024-11-21T07:53:13.230
Link: CVE-2023-27593

No data.