CVE-2022-3294 Node address isn't always verified when proxying

2023-03-0100:00:00

CWE-20

kubernetes

www.cve.org

cve-2022-3294

node address

proxying

kubernetes clusters

secure endpoints

bypass validation

api server's private network

CVSS3

6.6

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

AI Score

8.8

Confidence

High

EPSS

0.002

Percentile

57.8%

JSON

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.

CNA Affected

[
  {
    "vendor": "Kubernetes",
    "product": "Kubernetes",
    "versions": [
      {
        "version": "unspecified",
        "lessThanOrEqual": "v1.25.3",
        "status": "affected",
        "versionType": "custom"
      },
      {
        "version": "unspecified",
        "lessThanOrEqual": "v1.24.7",
        "status": "affected",
        "versionType": "custom"
      },
      {
        "version": "unspecified",
        "lessThanOrEqual": "v1.23.13",
        "status": "affected",
        "versionType": "custom"
      },
      {
        "version": "unspecified",
        "lessThanOrEqual": "v1.22.15",
        "status": "affected",
        "versionType": "custom"
      }
    ]
  }
]