Microsoft has confirmed the presence of a zero-day vulnerability in Windows, following reports of sophisticated malware-based hacking attacks on industrial control systems that take advantage of the security flaw.
Security shortcomings in the Windows shortcut (.lnk files) are being exploited by the Stuxnet rootlet, an information stealing threat that targets industrial and power plant control systems. The malware – which has been detected in the wild – executes automatically if an infected USB stick is accessed in Windows Explorer.
All versions of Windows – including Win XP SP2, widely used despite the discontinuation of further security updates earlier this month – are vulnerable. Disabling Windows AutoPlay and AutoRun – the normal defense against malware on USB sticks – has no effect.
The vulnerability exists because Windows incorrectly parses shortcuts in such a way that malicious code may be executed when the user clicks the displayed icon of a specially crafted shortcut. This vulnerability is most likely to be exploited through removable drives.
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