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CVE-2020-8561— Webhook redirect in kube-apiserver

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.

Red Hat OpenShift是美国红帽（Red Hat）公司的一款平台即服务（PaaS）云计算平台，它支持构建、测试、部署和运行应用程序。 Red Hat OpenShift 容器平台存在安全漏洞，目前尚无此漏洞的相关信息，请随时关注CNNVD或厂商公告。

CVSS 4.1 · Medium EPSS 2.10% · P81

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 1

VendorProduct Version RangeStatus
Kubernetes Kubernetes < * affected
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I. Basic Information for CVE-2020-8561

Vulnerability Information
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Vulnerability Title
Webhook redirect in kube-apiserver
Source: CVE Program / CVE List V5
Vulnerability Description
A security issue was discovered in Kubernetes where actors that control the responses of MutatingWebhookConfiguration or ValidatingWebhookConfiguration requests are able to redirect kube-apiserver requests to private networks of the apiserver. If that user can view kube-apiserver logs when the log level is set to 10, they can view the redirected responses and headers in the logs.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
未有动机的代理或中间人(混淆代理)
Source: CVE Program / CVE List V5
Vulnerability Title
Red Hat OpenShift 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Red Hat OpenShift是美国红帽（Red Hat）公司的一款平台即服务（PaaS）云计算平台，它支持构建、测试、部署和运行应用程序。 Red Hat OpenShift 容器平台存在安全漏洞，目前尚无此漏洞的相关信息，请随时关注CNNVD或厂商公告。
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 0 ~ * -

II. Public POCs for CVE-2020-8561

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III. Intelligence Information for CVE-2020-8561

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Vendor Advisories for CVE-2020-8561 (1)

Security Blog Posts for CVE-2020-8561 (1)

Other References for CVE-2020-8561 (2)

Same Patch Batch · Kubernetes · 2021-09-20 · 3 CVEs total

CVE-2021-25741 8.8 HIGH Symlink Exchange Can Allow Host Filesystem Access
CVE-2021-25740 3.1 LOW Holes in EndpointSlice Validation Enable Host Network Hijack

IV. Related Vulnerabilities

Same product: Kubernetes
Same vendor: Kubernetes
Same weakness: CWE-441

V. Comments for CVE-2020-8561

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