Improper input validation in Kubernetes

CVE-2022-3294

Users may have access to secure endpoints in the control plane network. Kubernetes clusters are only affected if an untrusted user can modify Node objects and send proxy requests to them. Kubernetes supports node proxying, which allows clients of kube-apiserver to access endpoints of a Kubelet to establish connections to Pods, retrieve container logs, and more. While Kubernetes already validates the proxying address for Nodes, a bug in kube-apiserver made it possible to bypass this validation. Bypassing this validation could allow authenticated requests destined for Nodes to to the API server's private network.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.016 (73.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2022-3294?
CVE-2022-3294 is a medium-severity vulnerability in Kubernetes, classified under Improper Input Validation. CVSS score: 6.6/10. Published 2023-03-01.
How severe is CVE-2022-3294?
Medium severity. CVSS v3 base score is 6.6 out of 10.
Is CVE-2022-3294 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.