[k8s.io/kubernetes] Privilege Escalation

Kubernetes version 1.5.0-1.5.4 is vulnerable to a privilege escalation in the PodSecurityPolicy admission plugin resulting in the ability to make use of any existing PodSecurityPolicy object.

References

• https://nvd.nist.gov/vuln/detail/CVE-2017-1000056
• https://github.com/kubernetes/kubernetes/issues/43459
• https://github.com/kubernetes/kubernetes/commit/7fef0a4f6a44ea36f166c39fdade5324eff2dd5e
• https://github.com/advisories/GHSA-2jx2-76rc-2v7v