(Pwn2Own) Microsoft Windows PlgBlt Integer Overflow Privilege Escalation Vulnerability

This vulnerability allows local attackers to escalate privileges on vulnerable installations of Microsoft Windows. 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 implementation of PlgBlt, an operation that writes bitmap graphics to parallelogram-shaped destination areas. The issue results from the lack of proper validation of user-supplied data, which can result in an integer overflow before writing to memory. An attacker can leverage this vulnerability to escalate privilege to the level of SYSTEM.