Microsoft Windows contains a vulnerability (CVE-2013-3660) that could allow an local attacker to gain elevated privileges on a targeted system. The vulnerability classified as critical has been found in Microsoft Windows XP/Vista/7/2000/Server 2003/2008. This affects the function win32k!EPATHOBJ::pprFlattenRec of the component Kernel. The vulnerability is due to improper handling of certain objects in kernel memory by the affected software. A local attacker with access to a targeted system could exploit this vulnerability by running a malicious program that is designed to cause the Windows kernel to perform improper memory operations on certain objects. If successful, the attacker could execute arbitrary code on the system with the privileges of the kernel, resulting in a complete system compromise. Proof of concept code that exploits this vulnerability is publicly available.