CVE-2021-25748: 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.
References
- github.com/advisories/GHSA-863x-868h-968x
- github.com/kubernetes/ingress-nginx/issues/8686
- github.com/kubernetes/ingress-nginx/pull/8623
- github.com/kubernetes/ingress-nginx/releases/tag/controller-v1.2.1
- groups.google.com/g/kubernetes-security-announce/c/avaRYa9c7I8
- nvd.nist.gov/vuln/detail/CVE-2021-25748
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