#VU82559 Input validation error in Ingress-NGINX Controller for Kubernetes - CVE-2022-4886

Vulnerability identifier: #VU82559

Vulnerability risk: High

CVSSv4.0: 6.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2022-4886

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Ingress-NGINX Controller for Kubernetes
Server applications / Other server solutions

Vendor: Kubernetes

Description

The vulnerability allows a remote user to compromise the affected system.

The vulnerability exists due to insufficient validation of user-supplied input. A remote user who can create or update ingress objects can use directives 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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Ingress-NGINX Controller for Kubernetes: 1.0.0 - 1.7.1

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External links
https://github.com/kubernetes/ingress-nginx/issues/10570
https://groups.google.com/g/kubernetes-security-announce/c/ge7u3qCwZLI
https://www.openwall.com/lists/oss-security/2023/10/25/5

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.