CVE-2021-25735 (Medium) detected in github.com/kubernetes/kubernetes-v1.16.6, github.com/kubernetes/apiextensions-apiserver-v0.16.6

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CVE-2021-25735 - Medium Severity Vulnerability

Vulnerable Libraries - github.com/kubernetes/kubernetes-v1.16.6, github.com/kubernetes/apiextensions-apiserver-v0.16.6

github.com/kubernetes/kubernetes-v1.16.6

Production-Grade Container Scheduling and Management

Dependency Hierarchy:

• ❌ github.com/kubernetes/kubernetes-v1.16.6 (Vulnerable Library)

github.com/kubernetes/apiextensions-apiserver-v0.16.6

API server for API extensions like CustomResourceDefinitions

Dependency Hierarchy:

• ❌ github.com/kubernetes/apiextensions-apiserver-v0.16.6 (Vulnerable Library)

Found in HEAD commit: 23cd89752b5978470bb8f7c88cae5ab268573cea

Found in base branch: master

Vulnerability Details

A security issue was discovered in kube-apiserver that could allow node updates to bypass a Validating Admission Webhook. You are only affected by this vulnerability if you run a Validating Admission Webhook for Nodes that denies admission based at least partially on the old state of the Node object. The issue is fixed in kube-apiserver version 1.21.0, 1.20.6, 1.19.10 and 1.18.18.

Publish Date: 2021-01-22

URL: CVE-2021-25735

CVSS 3 Score Details (6.5)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: High
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: None
  • Integrity Impact: High
  • Availability Impact: High

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: https://bugzilla.redhat.com/show_bug.cgi?id=1937562

Release Date: 2021-01-22

Fix Resolution: v1.18.18, v1.19.10, v1.20.6, v1.21.0