Understanding the Mysterious Inetpub Folder in Windows 11

Windows 11 users discovered a new 'inetpub' folder after a recent update. While its purpose is unclear, deleting it can create security vulnerabilities. Microsoft advises against removal, as the folder is part of a security enhancement. If deleted, users can restore it by enabling Internet Information Services. This action helps prevent potential exploitation and ensures system security.

Windows 11 users recently encountered an unexpected addition to their file system: a new folder named 'inetpub'. This folder, although empty, has sparked curiosity and confusion among users, leading some to delete it. However, this seemingly innocuous action has significant implications for system security.

The 'inetpub' folder is traditionally associated with managing logs for Internet Information Services (IIS). Surprisingly, this folder appeared even on systems where IIS was not activated. Microsoft has clarified that the presence of this folder is part of a security update designed to enhance protection against potential vulnerabilities. Specifically, deleting the folder could expose the system to a 'link following flaw', a security vulnerability that could be exploited by attackers.

Microsoft's security advisory emphasizes that the 'inetpub' folder should not be removed, regardless of whether IIS is active. This update is part of broader changes aimed at bolstering system security without requiring any action from IT administrators or end users.

For those who have already deleted the folder, Microsoft recommends restoring it by enabling Internet Information Services. This can be done by navigating to the Control Panel, selecting 'Programs and Features', and turning on Windows features. By checking the box next to Internet Information Services and clicking OK, users can reinstate the folder. Once restored, IIS can be uninstalled, and the folder will remain intact, ensuring the system's security is not compromised.

Satnam Narang, a senior staff research engineer at Tenable, advises users to heed Microsoft's guidance, even if the rationale behind the folder's necessity is not immediately clear. The update to Microsoft's security advisories underscores the importance of maintaining the folder to prevent exploitation.

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