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.

Affected

Kubernetes · Kubernetes ingress-nginx

CVSS v3.1 NVD

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

CVSS v3.1 LIGGITT

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

EPSS

0.69% chance of exploitation in the next 30 days, 52nd percentile

Published

2023-05-24

Updated

2025-01-16

Proof-of-concept exploits (1)

• cloud-Xolt/CVE0★ · 2023-11-30

Security advisories

• kubernetes/ingress-nginx/issues/8686
• https://groups.google.com/g/kubernetes-security-announce/c/avaRYa9c7I8
• advisories/GHSA-863x-868h-968x

References

• CVE Record
• NVD entry

Related

• CVE-2021-25742
• CVE-2021-25745
• CVE-2021-25746
• CVE-2023-5044