QID 377846

Date Published: 2023-01-30

QID 377846: Kubernetes Validating Admission Webhook Vulnerability

Kubernetes is an open-source container-orchestration system for automating deployment, scaling, and management of containerized applications.

Affected version:
kube-apiserver v1.20.0 - v1.20.5
kube-apiserver v1.19.0 - v1.19.9
kube-apiserver including and prior to v1.18.17
QID Detection Logic:(Authenticated)
The QID uses 'kubectl version' command to check for vulnerable versions of Kubernetes

Successful exploitation of the vulnerability may allow an attacker to node updates to bypass a Validating Admission Webhook

CVSS V3 rated as High - 6.5 severity.

CVSS V2 rated as Medium - 5.5 severity.

Solution

For more information please visit 100096

Workaround:
This only impacts validating admission plugins that rely on old values in certain fields, and does not impact calls from kubelets that go through the built-in NodeRestriction admission plugin.

Vendor References

100096 - github.com/kubernetes/kubernetes/issues/100096

CVEs related to QID 377846

CVE-2021-25735 |

Software Advisories

Advisory ID	Software	Component	Link
100096			github.com/kubernetes/kubernetes/issues/100096

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