(Pwn2Own) Apple macOS speechsynthesisd Unsigned Dylib Loading Privilege Escalation Vulnerability

This vulnerability allows local attackers to escalate privileges on vulnerable installations of Apple macOS. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the speechsynthesisd service. The issue results from the lack of proper validation of a library prior to loading it. An attacker can leverage this vulnerability to escalate privileges under the context of the current service.