The VBoxDrvNtDeviceControl function in VBoxDrv.sys in Sun xVM VirtualBox before 1.6.4 uses the METHOD_NEITHER communication method for IOCTLs and does not properly validate a buffer associated with the Irp object, which allows local users to gain privileges by opening the \\.\VBoxDrv device and calling DeviceIoControl to send a crafted kernel address.
https://www.exploit-db.com/exploits/6218
https://exchange.xforce.ibmcloud.com/vulnerabilities/44202
http://www.vupen.com/english/advisories/2008/2293
http://www.securityfocus.com/archive/1/495095/100/0/threaded
http://www.coresecurity.com/content/virtualbox-privilege-escalation-vulnerability
http://virtualbox.org/wiki/Changelog
http://sunsolve.sun.com/search/document.do?assetkey=1-66-240095-1
http://securitytracker.com/id?1020625