The command line interface (CLI) in Cisco Unified CallManager (CUCM) 5.0(1) through 5.0(3a) allows local users to overwrite arbitrary files by redirecting a command's output to a file or folder, aka bug CSCse31704.
https://exchange.xforce.ibmcloud.com/vulnerabilities/27690
http://www.vupen.com/english/advisories/2006/2774
http://www.securityfocus.com/bid/18952
http://www.cisco.com/en/US/products/products_security_advisory09186a00806e0b9f.shtml