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CVE-2021-25748— Ingress-nginx `path` sanitization can be bypassed with newline character

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.

Kubernetes ingress-nginx是云原生计算基金会（Cloud Native Computing Foundation）的Kubernetes 的入口控制器，使用NGINX作为反向代理和负载均衡器。 Kubernetes ingress-nginx 存在安全漏洞。攻击者利用该漏洞可以获取ingress-nginx控制器的凭证。

CVSS 7.6 · High EPSS 0.69% · P51
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I. Basic Information for CVE-2021-25748

Vulnerability Information
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Vulnerability Title
Ingress-nginx `path` sanitization can be bypassed with newline character
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 a newline character to bypass the sanitization of the `spec.rules[].http.paths[].path` field of an Ingress object (in the `networking.k8s.io` or `extensions` API group) to obtain the credentials of the ingress-nginx controller. In the default configuration, that credential has access to 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
Kubernetes ingress-nginx 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kubernetes ingress-nginx是云原生计算基金会（Cloud Native Computing Foundation）的Kubernetes 的入口控制器，使用NGINX作为反向代理和负载均衡器。 Kubernetes ingress-nginx 存在安全漏洞。攻击者利用该漏洞可以获取ingress-nginx控制器的凭证。
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 ~ 1.2.1 -

II. Public POCs for CVE-2021-25748

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III. Intelligence Information for CVE-2021-25748

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Other References for CVE-2021-25748 (2)

Same Patch Batch · Kubernetes · 2023-05-24 · 4 CVEs total

CVE-2023-1174 9.8 CRITICAL [minikube] Network Port exposure in minikube running on macOS using Docker driver
CVE-2023-1944 8.4 HIGH [minikube] ssh server with default password
CVE-2021-25749 7.8 HIGH runAsNonRoot logic bypass for Windows containers

IV. Related Vulnerabilities

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

V. Comments for CVE-2021-25748

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