The Audio component in Apple iOS before 9 allows remote attackers to cause a denial of service (memory corruption and application crash) via a crafted audio file.
http://lists.apple.com/archives/security-announce/2015/Sep/msg00001.html
http://lists.apple.com/archives/security-announce/2015/Sep/msg00005.html
http://lists.apple.com/archives/security-announce/2015/Sep/msg00008.html
https://support.apple.com/HT205212
https://support.apple.com/HT205213