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Denial of service in Kubernetes

Moderate severity GitHub Reviewed Published Apr 24, 2024 to the GitHub Advisory Database • Updated Jun 10, 2024

Package

gomod k8s.io/kubernetes/pkg/kubelet (Go)

Affected versions

>= 1.1.0, < 1.16.13
>= 1.17.0, < 1.17.9
>= 1.18.0, < 1.18.6

Patched versions

1.16.13
1.17.9
1.18.6

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.

References

Published by the National Vulnerability Database Jul 23, 2020
Published to the GitHub Advisory Database Apr 24, 2024
Reviewed Apr 24, 2024
Last updated Jun 10, 2024

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS score

0.044%
(13th percentile)

Weaknesses

CVE ID

CVE-2020-8557

GHSA ID

GHSA-55qj-gj3x-jq9r

Source code

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