CVE-2020-8557

CVE Details

Release Date:	2020-07-23
Impact:	None	What is this?

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.

See more information about CVE-2020-8557 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	5.5
Vector String:	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Version:	3.0
Attack Vector:	Local
Attack Complexity:	Low
Privileges Required:	Low
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	None
Integrity Impact:	None
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 7 (istio)	ELSA-2020-5765	2020-07-22
Oracle Linux version 7 (kata)	ELSA-2020-5765	2020-07-22
Oracle Linux version 7 (kata)	ELSA-2020-5766	2020-07-22
Oracle Linux version 7 (kata-image)	ELSA-2020-5765	2020-07-22
Oracle Linux version 7 (kata-image)	ELSA-2020-5766	2020-07-22
Oracle Linux version 7 (kata-runtime)	ELSA-2020-5765	2020-07-22
Oracle Linux version 7 (kata-runtime)	ELSA-2020-5766	2020-07-22
Oracle Linux version 7 (kernel-uek-container)	ELSA-2020-5765	2020-07-22
Oracle Linux version 7 (kernel-uek-container)	ELSA-2020-5766	2020-07-22
Oracle Linux version 7 (kubernetes)	ELSA-2020-5765	2020-07-22
Oracle Linux version 7 (kubernetes)	ELSA-2020-5766	2020-07-22
Oracle Linux version 7 (kubernetes)	ELSA-2020-5767	2020-07-22
Oracle Linux version 7 (olcne)	ELSA-2020-5765	2020-07-22
Oracle Linux version 7 (olcne)	ELSA-2020-5766	2020-07-22