An issue was discovered in certain Apple products. macOS before 10.13 is affected. The issue involves the "IOFireWireFamily" component. It allows attackers to execute arbitrary code in a privileged context or cause a denial of service (memory corruption) via a crafted app.
Apple Security Advisory 2017-09-25-1 - macOS High Sierra 10.13 is now available and addresses denial of service, insecure transit, and various other vulnerabilities.