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CVE-2021-25742— Ingress-nginx custom snippets allows retrieval of ingress-nginx serviceaccount token and secrets across all namespaces

Quick assessment

Affected
Kubernetes Kubernetes ingress-nginx
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.

ingress-nginx是开源的Kubernetes 的入口控制器，使用NGINX作为反向代理和负载均衡器。 ingress-nginx 存在安全漏洞，该漏洞源于创建或更新 ingress 对象的用户可以使用自定义片段功能来获取集群中的所有机密。

CVSS 7.6 · High EPSS 2.07% · P81
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I. Basic Information for CVE-2021-25742

Vulnerability Information
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Vulnerability Title
Ingress-nginx custom snippets allows retrieval of ingress-nginx serviceaccount token and secrets across all namespaces
Source: CVE Program / CVE List V5
Vulnerability Description
A security issue was discovered in ingress-nginx where a user that can create or update ingress objects can use the custom snippets feature to obtain all secrets in the cluster.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
ingress-nginx 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ingress-nginx是开源的Kubernetes 的入口控制器，使用NGINX作为反向代理和负载均衡器。 ingress-nginx 存在安全漏洞，该漏洞源于创建或更新 ingress 对象的用户可以使用自定义片段功能来获取集群中的所有机密。
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 ingress-nginx unspecified ~ 0.49.0 -

II. Public POCs for CVE-2021-25742

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III. Intelligence Information for CVE-2021-25742

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Vendor Advisories for CVE-2021-25742 (1)

Other References for CVE-2021-25742 (2)

IV. Related Vulnerabilities

Same product: Kubernetes ingress-nginx
Same vendor: Kubernetes
Same weakness: CWE-20

V. Comments for CVE-2021-25742

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