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Symlink Attack Affecting k8s.io/kubernetes/pkg/kubelet package, versions >=1.22.0 <1.22.2 >=1.21.0 <1.21.5 >=1.20.0 <1.20.11 <1.19.15

0.0
high

Snyk CVSS

    Attack Complexity Low
    Confidentiality High
    Integrity High
    Availability High

    Threat Intelligence

    EPSS 0.1% (41st percentile)
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NVD
8.1 high
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Red Hat
8.8 high

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  • Snyk ID SNYK-GOLANG-K8SIOKUBERNETESPKGKUBELET-1729741
  • published 8 Oct 2021
  • disclosed 8 Oct 2021
  • credit Fabricio Voznika and Mark Wolters of Google
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Introduced: 8 Oct 2021

CVE-2021-25741 Open this link in a new tab
CWE-59 Open this link in a new tab

How to fix?

Upgrade k8s.io/kubernetes/pkg/kubelet to version 1.22.2, 1.21.5, 1.20.11, 1.19.15 or higher.

Overview

k8s.io/kubernetes/pkg/kubelet is a package that contains the libraries that drive the Kubelet binary. The kubelet is responsible for node level pod management. It runs on each worker in the cluster.

Affected versions of this package are vulnerable to Symlink Attack. A security issue was discovered in Kubernetes where a user may be able to create a container with subpath volume mounts to access files & directories outside of the volume, including on the host filesystem.