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CVE-2020-8557

MEDIUM
Published 2020-07-23T16:59:38.580465Z
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CVSS Score

V3.1
5.5
/10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.002
probability
of exploitation in the wild

There is a 0.2% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.392
Higher than 39.2% of all CVEs

Attack Vector Metrics

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
NONE
Integrity
NONE
Availability
HIGH

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.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

Kubernetes

Kubernetes

Affected Versions:

1.15 1.14 1.13 1.12 1.11 1.10 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.18 1.17 1.16

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

✓ GitHub Reviewed MODERATE

Denial of service in Kubernetes

GHSA-55qj-gj3x-jq9r

Advisory Details

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.

Affected Packages

Go k8s.io/kubernetes/pkg/kubelet
ECOSYSTEM: ≥1.1.0 <1.16.13
Go k8s.io/kubernetes/pkg/kubelet
ECOSYSTEM: ≥1.17.0 <1.17.9
Go k8s.io/kubernetes/pkg/kubelet
ECOSYSTEM: ≥1.18.0 <1.18.6

CVSS Scoring

CVSS Score

5.0

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2020-8557
WEB https://github.com/kubernetes/kubernetes/issues/93032
WEB https://github.com/kubernetes/kubernetes/pull/92921
WEB https://github.com/kubernetes/kubernetes/commit/530f199b6e07cdaab32361e39709ac45f3fdc446
WEB https://github.com/kubernetes/kubernetes/commit/68750fefd3df76b7b008ef7b18e8acd18d5c2f2e
WEB https://github.com/kubernetes/kubernetes/commit/7fd849cffa2f93061fbcb0a6ae4efd0539b1e981
ADVISORY https://github.com/advisories/GHSA-55qj-gj3x-jq9r
PACKAGE https://github.com/kubernetes/kubernetes
WEB https://groups.google.com/g/kubernetes-security-announce/c/cB_JUsYEKyY/m/vVSO61AhBwAJ
WEB https://pkg.go.dev/vuln/GO-2024-2753
WEB https://security.netapp.com/advisory/ntap-20200821-0002

Advisory provided by GitHub Security Advisory Database. Published: April 24, 2024, Modified: June 10, 2024

References

https://github.com/kubernetes/kubernetes/issues/93032
https://groups.google.com/g/kubernetes-security-announce/c/cB_JUsYEKyY/m/vVSO61AhBwAJ
https://security.netapp.com/advisory/ntap-20200821-0002/
Published: 2020-07-23T16:59:38.580465Z
Last Modified: 2024-09-17T03:14:05.177Z
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