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Ensure custom tlsSecurityProfile configured for APIServer uses secure TLS version

An XCCDF Rule

Description

The configuration tlsSecurityProfile specifies TLS configurations to be used while establishing connections with the externally exposed servers. Though secure transport mode is used for establishing connections, the protocols used may not always be strong enough to avoid interception and manipulation of the data in transport. When Custom TLS Security profile is used it's always better to configure TLS version 1.2 or newer to avoid any security breaches. Update minTLSVersion configured in Custom tlsSecurityProfile using the following command: 

oc patch apiservers.config.openshift.io cluster --type 'merge' --patch '{"spec":{"tlsSecurityProfile":{"custom":{"minTLSVersion":"VersionTLS12"}}}}'
For more information, follow OpenShift documentation: the relevant documentation.

warning alert: Warning

This rule's check operates on the cluster configuration dump. Therefore, you need to use a tool that can query the OCP API, retrieve the /apis/config.openshift.io/v1/apiservers/cluster API endpoint to the local /apis/config.openshift.io/v1/apiservers/cluster file.

Rationale

The authenticity and integrity of the container platform and communication between nodes and components must be secure. If an insecure protocol, cipher, or algorithms is used, during transmission of data, the data can be intercepted and manipulated. To thwart the manipulation of the data during transmission secure protocol, cipher and algorithms must be used.

ID
xccdf_org.ssgproject.content_rule_api_server_tls_security_profile_custom_min_tls_version
Severity
Medium
References
Updated



Remediation - Kubernetes Patch

apiVersion: config.openshift.io/v1
kind: APIServer
metadata:
    name: cluster
spec:
    tlsSecurityProfile: