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CVE-2021-25737— Holes in EndpointSlice Validation Enable Host Network Hijack

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是美国Linux基金会的一套开源的Docker容器集群管理系统。该系统为容器化的应用提供资源调度、部署运行、服务发现和扩容缩容等功能。 Kubernetes kube-apiserver存在输入验证错误漏洞，攻击者可利用该漏洞可以通过Kubernetes kube-apiserver的Pod流量重定向绕过对数据的访问限制，从而获取敏感信息。

CVSS 2.7 · Low EPSS 1.33% · P70

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle
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I. Basic Information for CVE-2021-25737

Vulnerability Information
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Vulnerability Title
Holes in EndpointSlice Validation Enable Host Network Hijack
Source: CVE Program / CVE List V5
Vulnerability Description
A security issue was discovered in Kubernetes where a user may be able to redirect pod traffic to private networks on a Node. Kubernetes already prevents creation of Endpoint IPs in the localhost or link-local range, but the same validation was not performed on EndpointSlice IPs.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
不完整的黑名单
Source: CVE Program / CVE List V5
Vulnerability Title
Kubernetes 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kubernetes是美国Linux基金会的一套开源的Docker容器集群管理系统。该系统为容器化的应用提供资源调度、部署运行、服务发现和扩容缩容等功能。 Kubernetes kube-apiserver存在输入验证错误漏洞，攻击者可利用该漏洞可以通过Kubernetes kube-apiserver的Pod流量重定向绕过对数据的访问限制，从而获取敏感信息。
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 unspecified ~ 1.18.18 -

II. Public POCs for CVE-2021-25737

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III. Intelligence Information for CVE-2021-25737

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Vendor Advisories for CVE-2021-25737 (1)

Other References for CVE-2021-25737 (2)

IV. Related Vulnerabilities

Same product: Kubernetes
Same vendor: Kubernetes
Same weakness: CWE-184

V. Comments for CVE-2021-25737

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