Symlink Attack Affecting k8s.io/kubernetes/pkg/kubelet Open this link in a new tab package, versions >=1.3.0 <1.7.14 >=1.8.0 <1.8.9 >=1.9.0 <1.9.4
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17 May 2022
17 May 2022
Joel Smith of Red Hat
How to fix?
k8s.io/kubernetes/pkg/kubelet to version 1.7.14, 1.8.9, 1.9.4 or higher.
k8s.io/kubernetes/pkg/kubelet is a package that contains the libraries that drive the Kubelet binary. The kubelet is responsible for node level pod management. It runs on each worker in the cluster.
Affected versions of this package are vulnerable to Symlink Attack due to a symlink race. Every synchronization iteration, the Atomic Writer is looking for files that shouldn't be in a volume, and when it finds it is added to a list. When the search is done it deletes the files in the list. Because the deletion doesn't occur during the finding of the file, a malicious container can set up conditions to change the file selected for deletion with a symlink leading to a different file, which will be deleted.