QID 377856

Date Published: 2023-01-05

QID 377856: Kubernetes kubelet Neighboring Hosts Bypass Vulnerability

Kubernetes is an open-source container-orchestration system for automating deployment, scaling, and management of containerized applications.

Affected version:
kubelet/kube-proxy v1.18.0-1.18.3
kubelet/kube-proxy v1.17.0-1.17.6
kubelet/kube-proxy v1.1.0 -1.16.10
QID Detection Logic:(Authenticated)
The QID uses 'kubelet --version' command to check for vulnerable versions of Kubernetes kubelet

Successful exploitation of the vulnerability may allow an attacker kubernetes cluster network

  • CVSS V3 rated as Critical - 8.8 severity.
  • CVSS V2 rated as Medium - 5.8 severity.
    • Solution
    For more information please visit 92315

    Workaround:
    You may be vulnerable if: You are running a vulnerable version (see below) Your cluster nodes run in an environment where untrusted hosts share the same layer 2 domain (i.e. same LAN) as nodes Your cluster allows untrusted pods to run containers with CAP_NET_RAW (the Kubernetes default is to allow this capability). Your nodes (or hostnetwork pods) run any localhost-only services which do not require any further authentication. To list services that are potentially affected, run the following commands on nodes: - lsof +c 15 -P -n [email protected] -sTCP:LISTEN - lsof +c 15 -P -n [email protected] On a master node, an lsof entry like this indicates that the API server may be listening with an insecure port: COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME kube-apiserver 123 root 7u IPv4 26799 0t0 TCP 127.0.0.1:8080 (LISTEN)

    Vendor References

    CVEs related to QID 377856

    CVE-2020-8558 |
    Software Advisories
    Advisory ID Software Component Link
    92315 URL Logo github.com/kubernetes/kubernetes/issues/92315
    By selecting these links, you may be leaving CVEreport webspace. We have provided these links to other websites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other websites that are more appropriate for your purpose. CVEreport does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, CVEreport does not endorse any commercial products that may be mentioned on these sites. Please address comments about any linked pages to [email protected].