Civilian Contractors Engaged in Intelligence Activities Reduction Act of 2013 - Requires the Director of National Intelligence: (1) to study the extent to which contractors are used in the conduct of intelligence activities and the type of information to which such contractors have access; (2) by December 31, 2013, to submit a report containing the results of the study and a plan for reducing the number of intelligence community contractors with top secret security clearances that are engaged in intelligence activities, including analysis, by 25%; and (3) by December 31, 2014, to make such reduction.