Permissions, Privileges, and Access Controls in Kubernetes - CVE-2019-11246

Vulnerability details

The vulnerability allows a remote non-authenticated attacker to manipulate data.

The kubectl cp command allows copying files between containers and the user machine. To copy files from a container, Kubernetes runs tar inside the container to create a tar archive, copies it over the network, and kubectl unpacks it on the user’s machine. If the tar binary in the container is malicious, it could run any code and output unexpected, malicious results. An attacker could use this to write files to any path on the user’s machine when kubectl cp is called, limited only by the system permissions of the local user. Kubernetes affected versions include versions prior to 1.12.9, versions prior to 1.13.6, versions prior to 1.14.2, and versions 1.1, 1.2, 1.4, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 1.10, 1.11.

Affected software

How to mitigate CVE-2019-11246

External References

• https://github.com/kubernetes/kubernetes/pull/76788
• https://groups.google.com/forum/#!topic/kubernetes-security-announce/NLs2TGbfPdo
• https://security.netapp.com/advisory/ntap-20190919-0003/

Related Security Bulletins

• Multiple vulnerabilities in Kubernetes Kubernetes
• OpenShift Container Platform update for atomic-openshift
• OpenShift Container Platform 3.11 update for atomic-openshift
• Red Hat OpenShift Container Platform 3.10 update for atomic-openshift
• Red Hat OpenShiftContainer Platform 3 update for atomic-openshift
• Fedora 30 update for kubernetes