Heap-based buffer overflow in the DNS client library in configd in Apple iOS before 9.1, OS X before 10.11.1, and watchOS before 2.0.1 allows attackers to execute arbitrary code via a crafted app that sends a spoofed configd response to a client.
http://lists.apple.com/archives/security-announce/2015/Oct/msg00002.html
http://lists.apple.com/archives/security-announce/2015/Oct/msg00003.html
http://lists.apple.com/archives/security-announce/2015/Oct/msg00005.html
https://support.apple.com/HT205370
https://support.apple.com/HT205375