Denial of service in Kubernetes API server



| Updated: 2019-11-18
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-11253
CWE-ID CWE-400
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Kubernetes
Server applications / Frameworks for developing and running applications

Vendor Kubernetes

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Resource exhaustion

EUVDB-ID: #VU22824

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-11253

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

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

The vulnerability exists due to improper input validation when processing YAML or JSON data in Kubernetes API server. A remote attacker can pass a malicious file to the API server and consume excessive memory and CPU resources, leading to a denial of service (DoS) attack.

Note, this vulnerability can be exploited by a remote non-authenticated attacker in Kubernetes versions prior to 1.14.0 due to default RBAC policy.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Kubernetes: 1.0.0 - 1.16.1

CPE2.3 External links

https://access.redhat.com/errata/RHSA-2019:3239
https://github.com/kubernetes/kubernetes/issues/83253
https://groups.google.com/forum/#!topic/kubernetes-security-announce/jk8polzSUxs


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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



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