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Disable showmount in Azure NetApp Files (preview)

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Showmount on NFS clients has historically been how users can see exported file systems on an NFS server. By default, Azure NetApp Files enables showmount functionality to show exported paths but doesn't list the allowed client access. Instead, showmount displays that (everyone) has access. The setting allows NFS clients to use the showmount -e command to see a list of exports available on the Azure NetApp Files NFS-enabled storage endpoint.

This functionality might cause security scanners to flag the Azure NetApp Files NFS service as having a vulnerability because these scanners often use showmount to see what is being returned. In those scenarios, you might want to disable showmount on Azure NetApp Files.

Some applications, however, make use of showmount for functionality, such as Oracle OVM. In those scenarios, inform the security team of the application requirements.

The disable showmount capability is currently in preview. If you're using this feature for the first time, you need to register the feature first. By registering the feature, you disable the showmount. By unregistering the feature, you enable the showmount.

  1. Register the feature by running the following commands:

    Register-AzProviderFeature -ProviderNamespace Microsoft.NetApp -FeatureName ANFDisableShowmount

  2. Check the status of the feature registration:

    Note

    The RegistrationState may be in the Registering state for up to 60 minutes before changing to Registered. Wait until the status is Registered before continuing.

    Get-AzProviderFeature -ProviderNamespace Microsoft.NetApp -FeatureName ANFDisableShowmount

    You can also use Azure CLI commands az feature register and az feature show to register the feature and display the registration status.

  3. Confirm that you've disabled the showmount in the Overview menu of your Azure subscription. The attribute Disable Showmount displays as true if the operation succeeded.

    Screenshot of the Azure interface depicting the disable showmount option.

  4. If you need to enable showmount, unregister the feature.

    Unregister-AzProviderFeature -ProviderNamespace Microsoft.NetApp -FeatureName ANFDisableShowmount