Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Kubernetes | Kubernetes | < 1.16.13 |
Related Weaknesses (CWE)
References
- https://github.com/kubernetes/kubernetes/issues/93032Issue TrackingPatchThird Party Advisory
- https://groups.google.com/g/kubernetes-security-announce/c/cB_JUsYEKyY/m/vVSO61AMailing ListThird Party Advisory
- https://security.netapp.com/advisory/ntap-20200821-0002/Third Party Advisory
- https://github.com/kubernetes/kubernetes/issues/93032Issue TrackingPatchThird Party Advisory
- https://groups.google.com/g/kubernetes-security-announce/c/cB_JUsYEKyY/m/vVSO61AMailing ListThird Party Advisory
- https://security.netapp.com/advisory/ntap-20200821-0002/Third Party Advisory
FAQ
What is CVE-2020-8557?
CVE-2020-8557 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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...
How severe is CVE-2020-8557?
CVE-2020-8557 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-8557?
Check the references section above for vendor advisories and patch information. Affected products include: Kubernetes Kubernetes.