medium5.8
CVE-2021-25736
Kube-proxy may unintentionally forward traffic
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | k8s.io/kubernetes | < 1.21.0 | 1.21.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Kubernetes | Kubernetes | from 1.18.0 before 1.18.18 from 1.19.0 before 1.19.10 from 1.20.0 before 1.20.6 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/kubernetes/kubernetes/pull/99958
- https://groups.google.com/g/kubernetes-security-announce/c/lIoOPObO51Q/m/O15LOazPAgAJ
- https://security.netapp.com/advisory/ntap-20231221-0003/
- https://github.com/advisories/GHSA-35c7-w35f-xwgh
- https://nvd.nist.gov/vuln/detail/CVE-2021-25736
- https://github.com/kubernetes/kubernetes/commit/b014610de3e5cf1bb0f7844b5758d29fc18b75e6
- https://security.netapp.com/advisory/ntap-20231221-0003