Standalone Macromedia Flash Player 5.0 before 5,0,30,2 allows remote attackers to execute arbitrary programs via a .SWF file containing the "exec" FSCommand.
http://www.securityfocus.com/bid/4321
http://www.securityfocus.com/archive/1/262990
http://www.macromedia.com/support/flash/ts/documents/swf_clear.htm
http://www.macromedia.com/support/flash/ts/documents/standalone_update.htm