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Check: CNTR-K8-002620

Kubernetes STIG: CNTR-K8-002620 (in versions v1 r11 through v1 r7)

Title

Kubernetes API Server must disable basic authentication to protect information in transit. (Cat I impact)

Discussion

Kubernetes basic authentication sends and receives request containing username, uid, groups, and other fields over a clear text HTTP communication. Basic authentication does not provide any security mechanisms using encryption standards. PKI certificate-based authentication must be set over a secure channel to ensure confidentiality and integrity. Basic authentication must not be set in the manifest file.

Check Content

Change to the /etc/kubernetes/manifests/ directory on the Kubernetes Control Plane. Run the command: grep -i basic-auth-file * If "basic-auth-file" is set in the Kubernetes API server manifest file this is a finding.

Fix Text

Edit the Kubernetes API Server manifest file in the /etc/kubernetes/manifests directory on the Kubernetes Control Plane. Remove the setting "--basic-auth-file".

Additional Identifiers

Rule ID: SV-245542r918141_rule

Vulnerability ID: V-245542

Group Title: SRG-APP-000439-CTR-001080

Expert Comments

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CCIs

CCIs tied to check.

Number	Definition
CCI-002448	The organization distributes asymmetric cryptographic keys using: NSA-approved key management technology and processes; approved PKI Class 3 certificates or prepositioned keying material; or approved PKI Class 3 or Class 4 certificates and hardware security tokens that protect the user^s private key.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
SC-12 (3)	Asymmetric Keys