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Medium severity4.4NVD Advisory· Published Mar 17, 2023· Updated Jun 17, 2026

CVE-2023-27593

CVE-2023-27593

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
github.com/cilium/ciliumGo
< 1.11.151.11.15
github.com/cilium/ciliumGo
>= 1.12.0, < 1.12.81.12.8
github.com/cilium/ciliumGo
>= 1.13.0, < 1.13.11.13.1

Affected products

59

Patches

Vulnerability mechanics

References

9

News mentions

0

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