Ingress-nginx `path` sanitization can be bypassed with newline character
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.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2021-25748US | medium6.5 | — | ||
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[].… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/kubernetes/ingress-nginxPACKAGE
- https://github.com/kubernetes/ingress-nginx/issues/8686WEB
- https://github.com/kubernetes/ingress-nginx/pull/8623WEB
- https://github.com/kubernetes/ingress-nginx/releases/tag/controller-v1.2.1WEB
- https://groups.google.com/g/kubernetes-security-announce/c/avaRYa9c7I8WEB
- https://nvd.nist.gov/vuln/detail/CVE-2021-25748ADVISORY
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