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

2023-05-2400:00:00

CWE-20

kubernetes

www.cve.org

cve-2021-25748

security issue

ingress-nginx

bypass

newline character

sanitization

kubernetes

api group

credentials

secrets

7.6 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

LOW

Availability Impact

LOW

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L

7.7 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

23.3%

JSON

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.

CNA Affected

[
  {
    "vendor": "Kubernetes",
    "product": "Kubernetes ingress-nginx",
    "versions": [
      {
        "version": "unspecified",
        "lessThan": "1.2.1",
        "status": "affected",
        "versionType": "custom"
      }
    ]
  }
]