Vulnerability identifier: #VU23636

Vulnerability risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-11250

CWE-ID: CWE-256

Exploitation vector: Local

Exploit availability: No

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

Vendor: Kubernetes

Description

The vulnerability allows a local user to gain access to other users' credentials.

The vulnerability exists due Kubernetes client-go library logs request headers at verbosity levels of 7 or higher. This can disclose credentials to unauthorized users via logs or command output. Kubernetes components (such as kube-apiserver) prior to v1.16.0, which make use of basic or bearer token authentication, and run at high verbosity levels, are affected. A local user can view contents of the configuration file and gain access to passwords for 3rd party integration.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Kubernetes: 1.15.0 - 1.15.7, 1.14.0 - 1.14.10, 1.13.0 - 1.13.12

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External links
http://github.com/kubernetes/kubernetes/issues/81114
http://security.netapp.com/advisory/ntap-20190919-0003/
http://github.com/kubernetes/kubernetes/pull/81330/commits/010d8382642119c73cb2405286b347c08d704287#diff-f5423923c5f61f08517f3eb0014e48ee

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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