ResourceResolver.getAttribute(...) might return sensitive information

The method ResourceResolver.getAttribute(...) retrieves a named attribute from either

• the underlying resource provider or
• the authentication info passed to the factory

In addition it filters out some attributes supposed to contain sensitive information (https://github.com/apache/sling-org-apache-sling-resourceresolver/blob/d9e90e455c0f71e84414bb09c83d7e678f1a788e/src/main/java/org/apache/sling/resourceresolver/impl/helper/ResourceResolverControl.java#L400)

Although there is some JCR specific authentication info filtered in https://github.com/apache/sling-org-apache-sling-jcr-resource/blob/685c50921085941f4cbb1a3ccdbf90bad0605527/src/main/java/org/apache/sling/jcr/resource/internal/helper/jcr/JcrResourceProvider.java#L676, this is not-effective as the authentication info is retrieved without consulting any resource provider.

This affects the attribute user.jcr.credentials.