Announcing the release of Service Pack 1 for Office 2013 and SharePoint 2013
Service Pack 1 for Microsoft SharePoint Server 2013 (KB2817429)
Downloadable list of issues that the service pack fixes
How to tell if you have SP1 installed
In order to determine if SP1 is installed for Office 2013 or a related product, look for the program version in the list of installed programs in the Programs and Features control panel. If SP1 is installed, the version will be 15.0.4569.1506 or higher. Additionally, if you’ve installed the SP1 update for an MSI product, SP1 will be listed in Installed Updates in that same control panel.
Install the SharePoint March PU on servers running search components