The kubectl cp command allows copying files between containers and the user machine. To copy files from a container, Kubernetes creates a tar inside the container, 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. The untar function can both create and follow symbolic links. The issue is resolved in kubectl v1.11.9, v1.12.7, v1.13.5, and v1.14.0.
Kubernetes is prone to a vulnerability that may allow attackers to overwrite arbitrary files. Successful exploits may allow an attacker to write arbitrary files in the context of the user running the affected application. Versions prior to kubernetes 1.11.9, 1.12.7, 1.13.5, and 1.14.0 are vulnerable.
Updates are available. Please see the references or vendor advisory for more information.
Currently, we are not aware of any working exploits.
|2019-04-02||CVE-2019-9946||Security Features vulnerability in Kubernetes and Netapp products||Medium|
|2019-04-01||CVE-2019-1002100||Uncontrolled Resource Consumption ('Resource Exhaustion') vulnerability in Kubernetes||Medium|