CVE-2021-25736: Kube-proxy may unintentionally forward traffic

October 30, 2023 (updated October 31, 2023)

Kube-proxy on Windows can unintentionally forward traffic to local processes listening on the same port (“spec.ports[*].port”) as a LoadBalancer Service when the LoadBalancer controller does not set the “status.loadBalancer.ingress[].ip” field. Clusters where the LoadBalancer controller sets the “status.loadBalancer.ingress[].ip” field are unaffected.

References

github.com/advisories/GHSA-35c7-w35f-xwgh
github.com/kubernetes/kubernetes/commit/b014610de3e5cf1bb0f7844b5758d29fc18b75e6
github.com/kubernetes/kubernetes/pull/99958
groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q/m/O15LOazPAgAJ
nvd.nist.gov/vuln/detail/CVE-2021-25736

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