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Kubernetes: CVE-2021-25736: Kube-proxy on Windows can unintentionally forward traffic to local processes listening on the same port

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Kubernetes: CVE-2021-25736: Kube-proxy on Windows can unintentionally forward traffic to local processes listening on the same port

Severity
6
CVSS
(AV:N/AC:M/Au:S/C:C/I:N/A:N)
Published
10/30/2023
Created
11/25/2023
Added
11/24/2023
Modified
01/28/2025

Description

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.

Solution(s)

  • kubernetes-upgrade-1_18_19
  • kubernetes-upgrade-1_19_10
  • kubernetes-upgrade-1_20_6

References

  • https://attackerkb.com/topics/cve-2021-25736
  • CVE - 2021-25736
  • https://github.com/kubernetes/kubernetes/issues/99964
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