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A new zero-day flaw has hit Windows, and it seems capable of slipping past user account controls, security researchers have said.
"This is a serious flaw because it resides in win32k.sys, the kernel mode part of the Windows subsystem," said malware technology specialist Marco Giuliani on the Prevx blog. "It is a privilege escalation exploit which allows even limited user accounts to execute arbitrary code in kernel mode."
Giuliani warned that 32 and 64 bit versions of Windows XP, Vista and 7 were vulnerable. "Being a privilege escalation exploit, it bypasses by design even the protection given by the User Account Control and Limited User Account technology implemented in Windows Vista and Windows 7," he said.