Vulnerability · Published May 6, 2022 · Assigned by kubernetes

CVE-2021-25746Ingress-nginx directive injection via annotations

High 7.6

In plain English

A high-severity improper input validation in Kubernetes ingress-nginx from Kubernetes. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.4% (higher than 73% of all known vulnerabilities).

Severity (CVSS 3.1)7.6High

Exploit odds (30 days)1.4%top 26.8% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

A security issue was discovered in ingress-nginx where a user that can create or update ingress objects can use .metadata.annotations in 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 products (as reported)

Vendor	Product	Versions
Kubernetes	Kubernetes ingress-nginx	unspecified – before 1.2.0

Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L

References

https://groups.google.com/g/kubernetes-security-announce/c/hv2-SfdqcfQ x_refsource_MISC
https://github.com/kubernetes/ingress-nginx/issues/8503 x_refsource_MISC
https://security.netapp.com/advisory/ntap-20220609-0006/ x_refsource_CONFIRM