CVE-2020-8557
CVE-2020-8557 · Kubernetes node disk Denial of Service by writing to container /etc/hosts
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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 5.5 · Medium · EPSS 0.5% · Fix available
- Published
- Updated
Stack: system · containers
Affected products and versions
kubernetes
- Versions
- 1.15: Affected
- 1.14: Affected
- 1.13: Affected
- 1.12: Affected
- 1.11: Affected
- 1.10: Affected
- 1.9: Affected
- 1.8: Affected
- 1.7: Affected
- 1.6: Affected
- 1.5: Affected
- 1.4: Affected
- 1.3: Affected
- 1.2: Affected
- 1.1: Affected
- ≥ 1.18, < 1.18.6: Affected (custom)
- ≥ 1.17, < 1.17.9: Affected (custom)
- ≥ 1.16, < 1.16.13: Affected (custom)
Update to 1.16.13; Update to 1.17.9; Update to 1.18.6
kubernetes Debian:12
- Affected ranges
- ECOSYSTEM: < 1.18.5-1
Update to 1.18.5-1
kubernetes Debian:13
- Affected ranges
- ECOSYSTEM: < 1.18.5-1
Update to 1.18.5-1
kubernetes Debian:14
- Affected ranges
- ECOSYSTEM: < 1.18.5-1
Update to 1.18.5-1