An issue was discovered in certain Apple products. macOS before 10.12.5 is affected. The issue involves the "DiskArbitration" component. A race condition allows attackers to execute arbitrary code in a privileged context via a crafted app.
https://www.exploit-db.com/exploits/42146/
https://support.apple.com/HT207797
https://phoenhex.re/2017-06-09/pwn2own-diskarbitrationd-privesc