Cisco NX-OS 6.2(10) on Nexus and MDS 9000 devices allows local users to execute arbitrary OS commands by entering crafted tar parameters in the CLI, aka Bug ID CSCus44856.
http://www.securitytracker.com/id/1032764
http://www.securityfocus.com/bid/75503
http://tools.cisco.com/security/center/viewAlert.x?alertId=39569