The Client/Server Run-time Subsystem (CSRSS) in Microsoft Windows Server 2008 R2 and R2 SP1 and Windows 7 Gold and SP1 does not properly handle objects in memory, which allows local users to gain privileges via a crafted application, aka "Reference Count Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16478
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2013/ms13-019