Moderate severityNVD Advisory· Published Jul 23, 2020· Updated Sep 17, 2024
Kubernetes node disk Denial of Service by writing to container /etc/hosts
CVE-2020-8557
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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
k8s.io/kubernetes/pkg/kubeletGo | >= 1.1.0, < 1.16.13 | 1.16.13 |
k8s.io/kubernetes/pkg/kubeletGo | >= 1.17.0, < 1.17.9 | 1.17.9 |
k8s.io/kubernetes/pkg/kubeletGo | >= 1.18.0, < 1.18.6 | 1.18.6 |
Affected products
4- ghsa-coords3 versionspkg:golang/k8s.io/kubernetes/pkg/kubeletpkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Tumbleweedpkg:rpm/suse/kubernetes&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Containers%2015%20SP1
>= 1.1.0, < 1.16.13+ 2 more
- (no CPE)range: >= 1.1.0, < 1.16.13
- (no CPE)range: < 0.0.20250807T150727-1.1
- (no CPE)range: < 1.17.4-4.18.1
- Range: 1.15
Patches
Vulnerability mechanics
References
11- github.com/advisories/GHSA-55qj-gj3x-jq9rghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2020-8557ghsaADVISORY
- github.com/kubernetes/kubernetes/commit/530f199b6e07cdaab32361e39709ac45f3fdc446ghsaWEB
- github.com/kubernetes/kubernetes/commit/68750fefd3df76b7b008ef7b18e8acd18d5c2f2eghsaWEB
- github.com/kubernetes/kubernetes/commit/7fd849cffa2f93061fbcb0a6ae4efd0539b1e981ghsaWEB
- github.com/kubernetes/kubernetes/issues/93032ghsax_refsource_CONFIRMWEB
- github.com/kubernetes/kubernetes/pull/92921ghsaWEB
- groups.google.com/g/kubernetes-security-announce/c/cB_JUsYEKyY/m/vVSO61AhBwAJghsamailing-listx_refsource_MLISTWEB
- pkg.go.dev/vuln/GO-2024-2753ghsaWEB
- security.netapp.com/advisory/ntap-20200821-0002ghsaWEB
- security.netapp.com/advisory/ntap-20200821-0002/mitrex_refsource_CONFIRM
News mentions
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