The Microsoft Dynamics CRM 2013 Update Rollup 1 for Microsoft Dynamics CRM 2013 Service Pack 1 (SP1) is available on the download center.
UR 1 for Microsoft Dynamics CRM 2013 Service Pack 1 (SP1):
http://www.microsoft.com/en-us/download/details.aspx?id=44262.

Information on Update Rollup 1 for Microsoft Dynamics CRM 2013 Service Pack 1 (SP1)

The KB is located at http://support2.microsoft.com/kb/2953252.