An issue was discovered in certain Apple products. iOS before 11.4 is affected. Safari before 11.1.1 is affected. iCloud before 7.5 on Windows is affected. iTunes before 12.7.5 on Windows is affected. tvOS before 11.4 is affected. watchOS before 4.3.1 is affected. The issue involves the "WebKit" component. It allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption and application crash) via a crafted web site that triggers an @generatorState use-after-free.
https://www.exploit-db.com/exploits/44861/
https://usn.ubuntu.com/3687-1/
https://support.apple.com/HT208854
https://support.apple.com/HT208853
https://support.apple.com/HT208852
https://support.apple.com/HT208851
https://support.apple.com/HT208850
https://support.apple.com/HT208848
https://security.gentoo.org/glsa/201808-04
https://bugs.chromium.org/p/project-zero/issues/detail?id=1553