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CVE-2020-8557— Kubernetes node disk Denial of Service by writing to container /etc/hosts

Quick assessment

Affected
Kubernetes Kubernetes
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kubernetes（K8s）是云原生计算基金会（Cloud Native Computing Foundation）的一个开源系统，用于自动部署、扩展和管理容器化应用程序。 Kubernetes kubelet中存在资源管理错误漏洞。该漏洞源于网络系统或产品对系统资源（如内存、磁盘空间、文件等）的管理不当。以下产品及版本受到影响：Kubernetes kubelet 1.1版本至1.16.12版本，1.17.0版本至1.17.8版本，1.18.0版本至1.18.5版本。

CVSS 5.5 · Medium EPSS 0.50% · P42

Possible ATT&CK Techniques 1 AI

T1074 · Data Staged
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I. Basic Information for CVE-2020-8557

Vulnerability Information
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Vulnerability Title
Kubernetes node disk Denial of Service by writing to container /etc/hosts
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Kubernetes 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kubernetes（K8s）是云原生计算基金会（Cloud Native Computing Foundation）的一个开源系统，用于自动部署、扩展和管理容器化应用程序。 Kubernetes kubelet中存在资源管理错误漏洞。该漏洞源于网络系统或产品对系统资源（如内存、磁盘空间、文件等）的管理不当。以下产品及版本受到影响：Kubernetes kubelet 1.1版本至1.16.12版本，1.17.0版本至1.17.8版本，1.18.0版本至1.18.5版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Kubernetes Kubernetes 1.15 -

II. Public POCs for CVE-2020-8557

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III. Intelligence Information for CVE-2020-8557

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Vendor Advisories for CVE-2020-8557 (1)

Other References for CVE-2020-8557 (2)

IV. Related Vulnerabilities

Same product: Kubernetes
Same vendor: Kubernetes
Same weakness: CWE-400

V. Comments for CVE-2020-8557

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