CVE-2020-8557
Medium
Description
The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail.
SeverityMedium
CVSS5.5
Exploit probability—
ProductKubernetes
PublishedJul 23, 2020
First seenJul 23, 2020
Weakness typeCWE-400Uncontrolled resource consumption
How to fix
Update
- kubernetes kubernetes1.16.13, 1.17.9, 1.18.6 or later
- k8s.io/kubernetes/pkg/kubelet1.16.13, 1.17.9, 1.18.6 or later
- k8s.io/kubernetes1.16.13, 1.17.9, 1.18.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| kubernetes kubernetes | v < 1.16.13, 1.17.0 ≤ v < 1.17.9, 1.18.0 ≤ v < 1.18.6 | 1.16.13, 1.17.9, 1.18.6 |
| k8s.io/kubernetes/pkg/kubeletGo | 1.1.0 ≤ v < 1.16.13, 1.17.0 ≤ v < 1.17.9, 1.18.0 ≤ v < 1.18.6 | 1.16.13, 1.17.9, 1.18.6 |
| k8s.io/kubernetesGo | 1.1.0 ≤ v < 1.16.13, 1.17.0 ≤ v < 1.17.9, 1.18.0 ≤ v < 1.18.6 | 1.16.13, 1.17.9, 1.18.6 |
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