Vulnerability identifier: #VU53436

Vulnerability risk: Low

CVSSv3.1: 2.4 [CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-25737

CWE-ID: CWE-200

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 user to gain access to potentially sensitive information.

The vulnerability exists due to a host network hijacking flaw because of holes in EndpointSlice validation. A remote administrator can redirect pod traffic to private networks on a Node and gain unauthorized access to sensitive information on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Kubernetes: 1.21.0, 1.20.0 - 1.20.6, 1.19.0 - 1.19.10, 1.16.0 - 1.16.15, 1.17.0 - 1.17.17, 1.18.0 - 1.18.18

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External links
http://github.com/kubernetes/kubernetes/issues/102106
http://seclists.org/oss-sec/2021/q2/155

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Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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