CVE-2013-3154 (windows_7, windows_defender, windows_server_2008)

The signature-update functionality in Windows Defender on Microsoft Windows 7 and Windows Server 2008 R2 relies on an incorrect pathname, which allows local users to gain privileges via a Trojan horse application in the %SYSTEMDRIVE% top-level directory, aka "Microsoft Windows 7 Defender Improper Pathname Vulnerability."

Source: CVE-2013-3154 (windows_7, windows_defender, windows_server_2008)