Linter rule - secure parameter default

This rule finds hard-coded default values for secure parameters.

Linter rule code

Use the following value in the Bicep configuration file to customize rule settings:

secure-parameter-default

Solution

Don't provide a hard-coded default value for a secure parameter in your Bicep file, unless it's an empty string or an expression calling the newGuid() function.

You use the @secure() decorator on parameters that contain sensitive values, like passwords. When a parameter uses a secure decorator, the value of the parameter isn't logged or stored in the deployment history. This action prevents a malicious user from discovering the sensitive value.

However, when you provide a default value for a secured parameter, that value is discoverable by anyone who can access the template or the deployment history.

The following example fails this test because the parameter has a default value that is hard-coded.

@secure()
param adminPassword string = 'HardcodedPassword'

You can fix it by removing the default value.

@secure()
param adminPassword string

Optionally, you can use Quick Fix to remove the insecured default value:

Or, by providing an empty string for the default value.

@secure()
param adminPassword string = ''

Or, by using newGuid() to generate the default value.

@secure()
param adminPassword string = newGuid()

Next steps

For more information about the linter, see Use Bicep linter.