ZDI-18-1293: Trend Micro Anti-Virus UrlfWTPPagePtr KERedirect Use-After-Free Privilege Escalation Vulnerability

This vulnerability allows local attackers to escalate privileges on vulnerable installations of Trend Micro Anti-Virus. 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 UrlfWTPPagePtr variable in the KERedirect kext. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to execute code in the context of the kernel.