rsh in the remote_cmds component in Apple OS X before 10.11 allows local users to obtain root privileges via vectors involving environment variables.
lists.apple.com/archives/security-announce/2015/Sep/msg00008.html
packetstormsecurity.com/files/133826/issetugid-rsh-libmalloc-OS-X-Local-Root.html
packetstormsecurity.com/files/134087/Mac-OS-X-10.9.5-10.10.5-rsh-libmalloc-Privilege-Escalation.html
seclists.org/fulldisclosure/2015/Oct/5
www.rapid7.com/db/modules/exploit/osx/local/rsh_libmalloc
www.securityfocus.com/bid/76908
www.securitytracker.com/id/1033703
support.apple.com/HT205267
www.exploit-db.com/exploits/38371/
www.exploit-db.com/exploits/38540/