#VU30318 Resource exhaustion in Kubernetes - CVE-2019-11254

Vulnerability identifier: #VU30318

Vulnerability risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-11254

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Kubernetes
Server applications / Frameworks for developing and running applications

Vendor: Kubernetes

Description

The vulnerability allows a remote authenticated user to perform a denial of service (DoS) attack.

The Kubernetes API Server component in versions 1.1-1.14, and versions prior to 1.15.10, 1.16.7 and 1.17.3 allows an authorized user who sends malicious YAML payloads to cause the kube-apiserver to consume excessive CPU cycles while parsing YAML.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Kubernetes: 1.17.0 - 1.17.2

---

External links
https://github.com/kubernetes/kubernetes/issues/89535
https://groups.google.com/d/msg/kubernetes-announce/ALL9s73E5ck/4yHe8J-PBAAJ
https://security.netapp.com/advisory/ntap-20200413-0003/

---

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.