CVE-2020-8554 (GCVE-0-2020-8554)
Vulnerability from cvelistv5
Published
2021-01-21 17:09
Modified
2026-06-01 21:44
Severity ?
VLAI Severity ?
EPSS score ?
CWE
- CWE-283 - Unverified Ownership
Summary
Kubernetes API server in all versions allow an attacker who is able to create a ClusterIP service and set the spec.externalIPs field, to intercept traffic to that IP address. Additionally, an attacker who is able to patch the status (which is considered a privileged operation and should not typically be granted to users) of a LoadBalancer service can set the status.loadBalancer.ingress.ip to similar effect.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Kubernetes | Kubernetes |
Version: 0 ≤ |
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"discovery": "EXTERNAL"
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"title": "Kubernetes man in the middle using LoadBalancer or ExternalIPs",
"workarounds": [
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"lang": "en",
"value": "To restrict the use of external IPs we are providing an admission webhook container: k8s.gcr.io/multitenancy/externalip-webhook:v1.0.0. The source code and deployment instructions are published at https://github.com/kubernetes-sigs/externalip-webhook.\n\nAlternatively, external IPs can be restricted using OPA Gatekeeper. A sample ConstraintTemplate and Constraint can be found here: https://github.com/open-policy-agent/gatekeeper-library/tree/master/library/general/externalip."
}
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"datePublished": "2021-01-21T17:09:21.169Z",
"dateReserved": "2020-02-03T00:00:00.000Z",
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}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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