syslogd in the syslog subsystem in Apple iOS before 8 and Apple TV before 7 allows local users to change the permissions of arbitrary files via a symlink attack on an unspecified file.
archives.neohapsis.com/archives/bugtraq/2014-09/0106.html
archives.neohapsis.com/archives/bugtraq/2014-09/0107.html
support.apple.com/kb/HT6441
support.apple.com/kb/HT6442
www.securityfocus.com/bid/69882
www.securityfocus.com/bid/69923
www.securitytracker.com/id/1030866
exchange.xforce.ibmcloud.com/vulnerabilities/96082