CVE-2020-8557: Denial of service in Kubernetes
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.
References
- github.com/advisories/GHSA-55qj-gj3x-jq9r
- github.com/kubernetes/kubernetes
- github.com/kubernetes/kubernetes/commit/530f199b6e07cdaab32361e39709ac45f3fdc446
- github.com/kubernetes/kubernetes/commit/68750fefd3df76b7b008ef7b18e8acd18d5c2f2e
- github.com/kubernetes/kubernetes/commit/7fd849cffa2f93061fbcb0a6ae4efd0539b1e981
- github.com/kubernetes/kubernetes/issues/93032
- github.com/kubernetes/kubernetes/pull/92921
- groups.google.com/g/kubernetes-security-announce/c/cB_JUsYEKyY/m/vVSO61AhBwAJ
- nvd.nist.gov/vuln/detail/CVE-2020-8557
- security.netapp.com/advisory/ntap-20200821-0002
Code Behaviors & Features
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