CVE-2021-25735

medium
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Description

A security issue was discovered in kube-apiserver that could allow node updates to bypass a Validating Admission Webhook. Clusters are only affected by this vulnerability if they run a Validating Admission Webhook for Nodes that denies admission based at least partially on the old state of the Node object. Validating Admission Webhook does not observe some previous fields.

References

https://groups.google.com/g/kubernetes-security-announce/c/FKAGqT4jx9Y

https://github.com/kubernetes/kubernetes/issues/100096

Details

Source: MITRE

Published: 2021-09-06

Updated: 2021-09-13

Type: CWE-863

Risk Information

CVSS v2

Base Score: 5.5

Vector: AV:N/AC:L/Au:S/C:N/I:P/A:P

Impact Score: 4.9

Exploitability Score: 8

Severity: MEDIUM

CVSS v3

Base Score: 6.5

Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H

Impact Score: 5.2

Exploitability Score: 1.2

Severity: MEDIUM

Tenable Plugins

View all (1 total)

IDNameProductFamilySeverity
152103RHEL 7 / 8 : OpenShift Container Platform 4.8.2 packages and (RHSA-2021:2437)NessusRed Hat Local Security Checks
high