Information disclosure in Kubernetes

Published: 2020-12-15

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2020-8563 CVE-2020-8564
CWE-ID	CWE-532
Exploitation vector	Local
Public exploit	N/A
Vulnerable software Subscribe	Kubernetes Server applications / Frameworks for developing and running applications
Vendor	Kubernetes

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Inclusion of Sensitive Information in Log Files

EUVDB-ID: #VU48976

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-8563

CWE-ID: CWE-532 - Information Exposure Through Log Files

Exploit availability: No

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to software stores sensitive information into log files. In Kubernetes clusters using VSphere as a cloud provider, with a logging level set to 4 or above, VSphere cloud credentials will be leaked in the cloud controller manager's log. A local user can read the log files and gain access to sensitive data.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Kubernetes: 1.19.0 - 1.19.2

External links

http://github.com/kubernetes/kubernetes/issues/95621
http://groups.google.com/g/kubernetes-security-discuss/c/vm-HcrFUOCs/m/36utxAM5CwAJ

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.

2) Inclusion of Sensitive Information in Log Files

EUVDB-ID: #VU48977