The Graphics Device Interface (GDI) in win32k.sys in the kernel-mode drivers in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 does not properly validate user-mode input, which allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via crafted data, as demonstrated by a large height attribute of an IFRAME element rendered by Safari, aka "GDI Access Violation Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14603
https://exchange.xforce.ibmcloud.com/vulnerabilities/71873
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-008
http://www.us-cert.gov/cas/techalerts/TA12-045A.html
http://www.securitytracker.com/id?1026450
http://twitter.com/w3bd3vil/statuses/148454992989261824