Microsoft Windows NtUserfnINOUTNCCALCSIZE Information Leak Vulnerability

This vulnerability allows local attackers to leak sensitive information on vulnerable installations of Microsoft Windows. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the handling of NtUserfnINOUTNCCALCSIZE function. The issue lies in the failure to sanitize a buffer before calling a userland function resulting in the leak of an address on the kernel trap frame. An attacker can leverage this in concert with another vulnerability to achieve code execution at SYSTEM.