#VU31127 Resource exhaustion in Kubernetes - CVE-2019-1002100

Vulnerability identifier: #VU31127

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-2019-1002100

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.

In all Kubernetes versions prior to v1.11.8, v1.12.6, and v1.13.4, users that are authorized to make patch requests to the Kubernetes API Server can send a specially crafted patch of type "json-patch" (e.g. `kubectl patch --type json` or `"Content-Type: application/json-patch+json"`) that consumes excessive resources while processing, causing a Denial of Service on the API Server.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Kubernetes: 1.13.0 alpha.1 - 1.13.3

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External links
https://www.securityfocus.com/bid/107290
https://access.redhat.com/errata/RHSA-2019:1851
https://access.redhat.com/errata/RHSA-2019:3239
https://github.com/kubernetes/kubernetes/issues/74534
https://groups.google.com/forum/#!topic/kubernetes-announce/vmUUNkYfG9g
https://security.netapp.com/advisory/ntap-20190416-0002/

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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.