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Red Hat OpenShift: CVE-2020-8557: kubernetes: Node disk DOS by writing to container /etc/hosts

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Red Hat OpenShift: CVE-2020-8557: kubernetes: Node disk DOS by writing to container /etc/hosts

Severity
2
CVSS
(AV:L/AC:L/Au:N/C:N/I:N/A:P)
Published
07/23/2020
Created
12/30/2020
Added
12/29/2020
Modified
10/29/2021

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.

Solution(s)

  • linuxrpm-upgrade-atomic-openshift
  • linuxrpm-upgrade-openshift

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