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Downadup Worm: Autorun Security Risks Explained

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Discover the critical security challenge posed by the Downadup worm and why disabling Windows Autorun isn't enough to prevent infection, emphasizing the need for comprehensive protection.

The Autorun Security Conundrum: Understanding the Downadup Worm Threat

Recent confusion has emerged regarding proper protection methods against the widespread Downadup worm infection. The United States Computer Emergency Readiness Team (US-CERT) has issued an important clarification about Windows Autorun functionality that contradicts common advice.

According to the US-CERT alert, simply adjusting registry settings to disable Autorun—a frequently recommended defense against Downadup—provides insufficient protection. The alert specifically notes that setting the Autorun registry value to 0 fails to completely block code execution from autorun.inf files on newly connected devices.

This revelation is particularly concerning as the Downadup worm has reached mainstream awareness, with infections continuing to spread across various networks. The worm specifically exploits Autorun functionality, which has been a Windows feature since Windows 95, designed to automatically launch applications when storage media is connected.

The technical explanation from US-CERT highlights two key registry values that users might believe provide complete protection: Autorun and NoDriveTypeAutorun. Unfortunately, even setting NoDriveTypeAutorun to 0xFF (which Microsoft describes as disabling Autoplay on all drive types) leaves systems vulnerable when users click device icons in Windows Explorer.

Microsoft's response to this situation references Knowledge Base article 953252, published in May 2008, which addresses proper enforcement of the "disable Autorun registry key." While Windows Vista and Server 2008 users received this fix automatically through security update MS08-038, users of older systems including Windows 2000, XP, and Server 2003 must manually apply the update.

For complete protection against this attack vector, users should follow both the official Microsoft guidance on mitigating Autorun-based infection attempts and ensure they've installed the appropriate updates for their specific Windows version.

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