CVE-2020-8557

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Summary

CVECVE-2020-8557
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-07-23 17:15:00 UTC
Updated2023-01-27 20:35:00 UTC
DescriptionThe 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.

Risk And Classification

Problem Types: CWE-400

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Kubernetes Kubernetes All All All All
Application Kubernetes Kubernetes All All All All

References

ReferenceSourceLinkTags
CVE-2020-8557 Kubernetes Vulnerability in NetApp Products | NetApp Product Security CONFIRM security.netapp.com
[Security Advisory] CVE-2020-8557: Node disk DOS by writing to container /etc/hosts MLIST groups.google.com Mailing List, Third Party Advisory
CVE-2020-8557: Node disk DOS by writing to container /etc/hosts · Issue #93032 · kubernetes/kubernetes · GitHub CONFIRM github.com Patch, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

LEGACY: Kebe Liu of DaoCloud

Legacy QID Mappings

  • 239750 Red Hat OpenShift Container Platform 542 Security Update (RHSA-2021:3915)
  • 376727 Kubernetes Kubelet Node Disk Denial of Service (DoS) Vulnerability
  • 377853 Kubernetes Kublet Node Disk Denial of Service (DoS) Vulnerability
  • 501593 Alpine Linux Security Update for k3s
  • 6140242 AWS Bottlerocket Security Update for Kubernetes (GHSA-fpgg-9xgf-f2wm)
  • 770036 Red Hat OpenShift Container Platform 4.5.7 Packages Security Update (RHSA-2020:3519)
  • 770037 Red Hat OpenShift Container Platform 4.4.19 Security Update (RHSA-2020:3579)
  • 770038 Red Hat OpenShift Container Platform 4.3.38 Security Update (RHSA-2020:3808)
  • 900220 CBL-Mariner Linux Security Update for kubernetes 1.16.10
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