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.
References
| Link | Resource |
|---|---|
| https://github.com/cilium/cilium/pull/24075 | Third Party Advisory |
| https://github.com/cilium/cilium/releases/tag/v1.11.15 | Third Party Advisory |
| https://github.com/cilium/cilium/releases/tag/v1.12.8 | Third Party Advisory |
| https://github.com/cilium/cilium/releases/tag/v1.13.1 | Third Party Advisory |
| https://github.com/cilium/cilium/security/advisories/GHSA-4hc4-pgfx-3mrx | Third Party Advisory |
| https://kubernetes.io/docs/reference/access-authn-authz/rbac/ | Third Party Advisory |
| https://github.com/cilium/cilium/pull/24075 | Third Party Advisory |
| https://github.com/cilium/cilium/releases/tag/v1.11.15 | Third Party Advisory |
| https://github.com/cilium/cilium/releases/tag/v1.12.8 | Third Party Advisory |
| https://github.com/cilium/cilium/releases/tag/v1.13.1 | Third Party Advisory |
| https://github.com/cilium/cilium/security/advisories/GHSA-4hc4-pgfx-3mrx | Third Party Advisory |
| https://kubernetes.io/docs/reference/access-authn-authz/rbac/ | Third Party Advisory |
Configurations
Configuration 1 (hide)
|
History
21 Nov 2024, 07:53
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://github.com/cilium/cilium/pull/24075 - Third Party Advisory | |
| References | () https://github.com/cilium/cilium/releases/tag/v1.11.15 - Third Party Advisory | |
| References | () https://github.com/cilium/cilium/releases/tag/v1.12.8 - Third Party Advisory | |
| References | () https://github.com/cilium/cilium/releases/tag/v1.13.1 - Third Party Advisory | |
| References | () https://github.com/cilium/cilium/security/advisories/GHSA-4hc4-pgfx-3mrx - Third Party Advisory | |
| References | () https://kubernetes.io/docs/reference/access-authn-authz/rbac/ - Third Party Advisory | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 4.4 |
07 Nov 2023, 04:10
| Type | Values Removed | Values Added |
|---|---|---|
| Summary | 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. |
Information
Published : 2023-03-17 20:15
Updated : 2024-11-21 07:53
NVD link : CVE-2023-27593
Mitre link : CVE-2023-27593
CVE.ORG link : CVE-2023-27593
JSON object : View
Products Affected
cilium
- cilium
CWE
CWE-276
Incorrect Default Permissions