Ruby on Rails: RCE which may occur due to `ActiveSupport::MessageVerifier` or `ActiveSupport::MessageEncryptor` (especially Active storage)

Since ActiveSupport::MessageVerifier and ActiveSupport::MessageEncryptor use Marshal as the default serializer, I confirmed that RCE is possible by object injection. ruby https://github.com/rails/rails/blob/v5.2.2/activesupport/lib/activesupport/messageverifier.rbL110 def initializesecret, option...