An issue was discovered in certain Apple products. iOS before 11.3.1 is affected. macOS before 10.13.4 Security Update 2018-001 is affected. tvOS before 11.4 is affected. watchOS before 4.3.1 is affected. The issue involves the "Crash Reporter" component. It allows attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted app that replaces a privileged port name.
https://support.apple.com/HT208851
https://support.apple.com/HT208850
https://support.apple.com/HT208743
https://support.apple.com/HT208742
http://www.securitytracker.com/id/1040744