SB2020121507 - Information disclosure in Kubernetes

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Inclusion of Sensitive Information in Log Files (CVE-ID: CVE-2020-8563)

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.

2) Inclusion of Sensitive Information in Log Files (CVE-ID: CVE-2020-8564)

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 a logging level of at least 4, processing a malformed docker config file will result in the contents of the docker config file being leaked, which can include pull secrets or other registry credentials. A local user can read the log files and gain access to sensitive data.

Remediation

Install update from vendor's website.

References

• https://github.com/kubernetes/kubernetes/issues/95621
• https://groups.google.com/g/kubernetes-security-discuss/c/vm-HcrFUOCs/m/36utxAM5CwAJ
• https://github.com/kubernetes/kubernetes/issues/95622