On Nov 16, 2015 version 3.3 of this add-on was released to address an exploitable SQL injection vulnerability. If you are still using a version of this add-on which is below 3.3 or released before Nov 16, 2015 then it is essential that you update to the latest version of the add-on as soon as possible to fix this security issue. If you have any further questions, please ask.
The xf_banner table had some changes made so links could be made longer. In order to update to Banner v3.2 you will need to uninstall Banner v3.1. Be sure to save your Banner Admin data before uninstalling so you can easily copy it back to the Banner Admin page.
Added Expire Date field. This requires previous versions of banner to be uninstalled in order to create the latest table. Please make sure to copy all data from the xf_banner table to a safe place so you can re-enter the data into the new table.