CVE-2023-27593

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Summary

CVECVE-2023-27593
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-03-17 20:15:00 UTC
Updated2023-11-07 04:10:00 UTC
DescriptionCilium 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.

Risk And Classification

Problem Types: CWE-276

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Cilium Cilium All All All All

References

ReferenceSourceLinkTags
Release 1.11.15 · cilium/cilium · GitHub MISC github.com
Using RBAC Authorization | Kubernetes MISC kubernetes.io
Release 1.13.1 · cilium/cilium · GitHub MISC github.com
Release 1.12.8 · cilium/cilium · GitHub MISC github.com
agent: install CNI plugin binary in an InitContainer by squeed · Pull Request #24075 · cilium/cilium · GitHub MISC github.com
cilium-agent container can access the host via `hostPath` mount · Advisory · cilium/cilium · GitHub MISC github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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