CVE-2020-8557 (GCVE-0-2020-8557)

Vulnerability from cvelistv5 – Published: 2020-07-23 16:59 – Updated: 2024-09-17 03:14
VLAI
Title
Kubernetes node disk Denial of Service by writing to container /etc/hosts
Summary
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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-400 - Uncontrolled Resource Consumption
Assigner
References
Impacted products
Vendor Product Version
Kubernetes Kubernetes Affected: 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 (custom)
Affected: 1.17 , < 1.17.9 (custom)
Affected: 1.16 , < 1.16.13 (custom)
Create a notification for this product.
Date Public
2020-07-15 00:00
Credits
Kebe Liu of DaoCloud
Show details on NVD website
To clipboard 

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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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