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CVE-2020-8558— Kubernetes node setting allows for neighboring hosts to bypass localhost boundary

Quick assessment

Affected
Kubernetes Kubernetes
Exploitation
Public or AI PoC available; prioritize validation
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中的Kubelet和kube-proxy 1.1.0版本至1.16.10版本、1.17.0版本至1.17.6版本和1.18.0版本至1.18.3版本中存在安全漏洞。攻击者可利用该漏洞获取权限或访问监听本地主机端口的任意服务的敏感信息。

CVSS 5.4 · Medium EPSS 3.60% · P89

Possible ATT&CK Techniques 1 AI

T1046 · Network Service Discovery
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I. Basic Information for CVE-2020-8558

Vulnerability Information
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Vulnerability Title
Kubernetes node setting allows for neighboring hosts to bypass localhost boundary
Source: CVE Program / CVE List V5
Vulnerability Description
The Kubelet and kube-proxy components in versions 1.1.0-1.16.10, 1.17.0-1.17.6, and 1.18.0-1.18.3 were found to contain a security issue which allows adjacent hosts to reach TCP and UDP services bound to 127.0.0.1 running on the node or in the node's network namespace. Such a service is generally thought to be reachable only by other processes on the same host, but due to this defeect, could be reachable by other hosts on the same LAN as the node, or by containers running on the same node as the service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
未保护的候选通道
Source: CVE Program / CVE List V5
Vulnerability Title
Kubernetes 安全漏洞
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中的Kubelet和kube-proxy 1.1.0版本至1.16.10版本、1.17.0版本至1.17.6版本和1.18.0版本至1.18.3版本中存在安全漏洞。攻击者可利用该漏洞获取权限或访问监听本地主机端口的任意服务的敏感信息。
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 prior to 1.18.4 -

II. Public POCs for CVE-2020-8558

# POC Description Source Link Shenlong Link
1 Information about Kubernetes CVE-2020-8558, including proof of concept exploit. https://github.com/tabbysable/POC-2020-8558 POC Details
2 Crafting raw TCP/IP packets to send to poorly configured servers - CVE-2020-8558 PoC https://github.com/rhysemmas/martian-packets POC Details
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III. Intelligence Information for CVE-2020-8558

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Vendor Advisories for CVE-2020-8558 (1)

Other References for CVE-2020-8558 (2)

IV. Related Vulnerabilities

Same product: Kubernetes
Same vendor: Kubernetes
Same weakness: CWE-420

V. Comments for CVE-2020-8558

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