An issue was discovered in certain Apple products. iOS before 11.3 is affected. macOS before 10.13.4 is affected. iCloud before 7.4 on Windows is affected. iTunes before 12.7.4 on Windows is affected. tvOS before 11.3 is affected. watchOS before 4.3 is affected. The issue involves the "Security" component. A buffer overflow allows attackers to execute arbitrary code in a privileged context via a crafted app.
https://support.apple.com/HT208698
https://support.apple.com/HT208697
https://support.apple.com/HT208696
https://support.apple.com/HT208694
https://support.apple.com/HT208693
https://support.apple.com/HT208692
http://www.securitytracker.com/id/1040608