Details

Disable fixing of malformed updates.

Rationale:

The API sServer will potentially attempt to fix the update requests to pass the validation even if the requests are malformed. Malformed requests are one of the potential ways to interact with a service without legitimate information. Such requests could potentially be used to sabotage API Server responses.

Solution

Edit the API server pod specification file ‘/etc/kubernetes/manifests/kube-apiserver.yaml’ on the master node and set the below parameter.

–repair-malformed-updates=false

Impact:

Malformed requests from clients would be rejected.

Supportive Information

The following resource is also helpful.

• https://workbench.cisecurity.org/files/1788

This security hardening control applies to the following category of controls within NIST 800-53: Configuration Management.This control applies to the following type of system Unix.

References

• 800-53|CM-6b.
• CSCv6|14

Source

• Tenable.com/audits