A security issue was discovered in Kubernetes where actors that control the responses of MutatingWebhookConfiguration or ValidatingWebhookConfiguration requests are able to redirect kube-apiserver requests to private networks of the apiserver. If that user can view kube-apiserver logs when the log level is set to 10, they can view the redirected responses and headers in the logs.
Published 2021-09-20 17:15:08
Updated 2021-11-06 03:04:44
Source Kubernetes
View at NVD,   CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2020-8561

0.08%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 32 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2020-8561

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
4.0
MEDIUM AV:N/AC:L/Au:S/C:P/I:N/A:N
8.0
2.9
NIST
4.1
MEDIUM CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N
2.3
1.4
Kubernetes
4.1
MEDIUM CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N
2.3
1.4
NIST

CWE ids for CVE-2020-8561

  • The product receives a request, message, or directive from an upstream component, but the product does not sufficiently preserve the original source of the request before forwarding the request to an external actor that is outside of the product's control sphere. This causes the product to appear to be the source of the request, leading it to act as a proxy or other intermediary between the upstream component and the external actor.
    Assigned by: jordan@liggitt.net (Secondary)
  • The product uses an externally controlled name or reference that resolves to a resource that is outside of the intended control sphere.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2020-8561

Products affected by CVE-2020-8561

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