Kubernetes API Server CVE-2019-11253 Denial of Service Vulnerability

Description

Kubernetes API Server is prone to a denial-of-service vulnerability. Successful exploitation of the issue will cause excessive CPU resource consumption, resulting in a denial-of-service condition. The following products are affected: Kubernetes 1.0.0 through 1.12.x Kubernetes 1.13.0 through 1.13.11 Kubernetes 1.14.0 through 1.14.7 Kubernetes 1.15.0 through 1.15.4 Kubernetes 1.16.0 through 1.16.1

Technologies Affected

• Cisco Container Platform
• Kubernetes Kubernetes 1.0.0
• Kubernetes Kubernetes 1.10.0
• Kubernetes Kubernetes 1.10.1
• Kubernetes Kubernetes 1.10.10
• Kubernetes Kubernetes 1.10.11
• Kubernetes Kubernetes 1.10.12
• Kubernetes Kubernetes 1.10.2
• Kubernetes Kubernetes 1.10.3
• Kubernetes Kubernetes 1.10.4
• Kubernetes Kubernetes 1.10.5
• Kubernetes Kubernetes 1.10.6
• Kubernetes Kubernetes 1.10.7
• Kubernetes Kubernetes 1.10.8
• Kubernetes Kubernetes 1.10.9
• Kubernetes Kubernetes 1.11.0
• Kubernetes Kubernetes 1.11.1
• Kubernetes Kubernetes 1.11.2
• Kubernetes Kubernetes 1.11.3
• Kubernetes Kubernetes 1.11.4
• Kubernetes Kubernetes 1.11.5
• Kubernetes Kubernetes 1.11.6
• Kubernetes Kubernetes 1.11.7
• Kubernetes Kubernetes 1.11.8
• Kubernetes Kubernetes 1.11.9
• Kubernetes Kubernetes 1.12.0
• Kubernetes Kubernetes 1.12.1
• Kubernetes Kubernetes 1.12.10
• Kubernetes Kubernetes 1.12.2
• Kubernetes Kubernetes 1.12.3
• Kubernetes Kubernetes 1.12.4
• Kubernetes Kubernetes 1.12.5
• Kubernetes Kubernetes 1.12.6
• Kubernetes Kubernetes 1.12.7
• Kubernetes Kubernetes 1.12.9
• Kubernetes Kubernetes 1.13.0
• Kubernetes Kubernetes 1.13.11
• Kubernetes Kubernetes 1.13.3
• Kubernetes Kubernetes 1.13.4
• Kubernetes Kubernetes 1.13.5
• Kubernetes Kubernetes 1.13.6
• Kubernetes Kubernetes 1.13.8
• Kubernetes Kubernetes 1.13.9
• Kubernetes Kubernetes 1.14.0
• Kubernetes Kubernetes 1.14.2
• Kubernetes Kubernetes 1.14.3
• Kubernetes Kubernetes 1.14.4
• Kubernetes Kubernetes 1.14.5
• Kubernetes Kubernetes 1.14.7
• Kubernetes Kubernetes 1.15.0
• Kubernetes Kubernetes 1.15.1
• Kubernetes Kubernetes 1.15.2
• Kubernetes Kubernetes 1.15.4
• Kubernetes Kubernetes 1.16.0
• Kubernetes Kubernetes 1.16.1
• Redhat OpenShift Container Platform 3.10
• Redhat OpenShift Container Platform 3.11
• Redhat OpenShift Container Platform 3.9
• Redhat OpenShift Container Platform 4.1

Recommendations

Block external access at the network boundary, unless external parties require service.
If global access isn’t needed, filter access to the affected computer at the network boundary. Restricting access to only trusted computers and networks might greatly reduce the likelihood of a successful exploit.

Run all software as a nonprivileged user with minimal access rights.
To reduce the impact of latent vulnerabilities, always run nonadministrative software as an unprivileged user with minimal access rights.

Updates are available. Please see the references or vendor advisory for more information.