Permissions, Privileges, and Access Controls in Kubernetes - CVE-2020-8559

Vulnerability identifier: #VU34130

CSH Severity: Medium

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:P/U:Green

CVE-ID: CVE-2020-8559

CWE-ID: CWE-264

Exploitation vector: Remote access

Exploit availability: Public exploit is available

Affected software:
Kubernetes
Migration Toolkit for Containers
Red Hat OpenShift Container Platform
Consul
atomic-openshift (Red Hat package)
openshift-ansible (Red Hat package)
atomic-openshift-cluster-autoscaler (Red Hat package)
golang-github-prometheus-alertmanager (Red Hat package)
atomic-openshift-service-idler (Red Hat package)
atomic-openshift-metrics-server (Red Hat package)
atomic-openshift-node-problem-detector (Red Hat package)
openshift-enterprise-autoheal (Red Hat package)
atomic-openshift-web-console (Red Hat package)
atomic-openshift-descheduler (Red Hat package)
openshift-enterprise-cluster-capacity (Red Hat package)
golang-github-openshift-oauth-proxy (Red Hat package)
golang-github-prometheus-node_exporter (Red Hat package)
atomic-enterprise-service-catalog (Red Hat package)
golang-github-prometheus-prometheus (Red Hat package)
atomic-openshift-dockerregistry (Red Hat package)
openshift-kuryr (Red Hat package)
openshift (Red Hat package)
IBM Cloud Pak for Watson AIOps
IBM CICS TX Advanced
IBM CICS TX Standard

The vulnerability allows a remote privileged user to execute arbitrary code.

The Kubernetes kube-apiserver in versions v1.6-v1.15, and versions prior to v1.16.13, v1.17.9 and v1.18.6 are vulnerable to an unvalidated redirect on proxied upgrade requests that could allow an attacker to escalate privileges from a node compromise to a full cluster compromise.

Install update from vendor's website.

• https://github.com/kubernetes/kubernetes/issues/92914
• https://groups.google.com/d/msg/kubernetes-security-announce/JAIGG5yNROs/19nHQ5wkBwAJ