Microsoft Windows NtGdiExtTextOutW Out-Of-Bounds Write 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 kernel-mode routines that output text to a device context. The issue results from the lack of proper validation of user-supplied data, which can result in a memory access past the end of an allocated buffer. An attacker can leverage this vulnerability to escalate privilege to the level of SYSTEM.