An issue was discovered in Rancher versions up to and including 2.5.15 and 2.6.6 where sensitive fields, like passwords, API keys and Ranchers service account token (used to provision clusters), were stored in plaintext directly on Kubernetes objects like Clusters, for example cluster.management.cattle.io. Anyone with read access to those objects in the Kubernetes API could retrieve the plaintext version of those sensitive data.
To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':
msf > use auxiliary/gather/rancher_authenticated_api_cred_exposure
msf auxiliary(rancher_authenticated_api_cred_exposure) > show actions
...actions...
msf auxiliary(rancher_authenticated_api_cred_exposure) > set ACTION < action-name >
msf auxiliary(rancher_authenticated_api_cred_exposure) > show options
...show and set options...
msf auxiliary(rancher_authenticated_api_cred_exposure) > run
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– Jim O’Gorman | President, Offensive Security