In April, Microsoft released a critical update addressing CVE-2025-21204, a vulnerability affecting the Windows Update Stack. As part of this patch, users may have noticed the creation of a new folder called inetpub on their devices. This update has raised concerns among users, especially since this folder is typically associated with Microsoft’s Internet Information Services (IIS) web server platform. The presence of this folder has sparked questions, with many wondering about its purpose and whether it can be safely deleted.
Microsoft clarified the situation in their official update, reassuring users that the folder is necessary for enhanced security and should not be deleted. In this article, we’ll break down what the inetpub folder is, why it’s now part of Windows systems, and what users need to know about the CVE-2025-21204 vulnerability.
What is the Inetpub Folder and Why is it Important?
Microsoft’s April Patch Tuesday updates included a fix for CVE-2025-21204, a vulnerability in the Windows Update Stack that could potentially allow an authenticated attacker to elevate their privileges locally on the system. As part of this fix, a new folder called %systemdrive%\inetpub is created on Windows devices.
This folder, which is often linked to the Internet Information Services (IIS) web server platform, is normally used to host websites, web applications, and services on Windows. Although most home users will not have IIS installed or active, the inetpub folder has a specific purpose in the context of this security patch.
What Exactly Does CVE-2025-21204 Do?
When exploited, CVE-2025-21204 allows an authenticated attacker to gain elevated privileges on a system. Specifically, an attacker can manipulate file management operations, potentially compromising sensitive files or executing malicious code with the highest possible system-level privileges (NT AUTHORITY\SYSTEM).
The vulnerability itself stems from a link following flaw, which allows an attacker to manipulate filenames that point to unintended resources. In simpler terms, this flaw can let attackers replace legitimate files with malicious links that could take control of the system.
Microsoft’s solution involves creating the inetpub folder as a way to deny access to certain files that could otherwise be vulnerable to exploitation. By setting folder permissions correctly, the system ensures attackers cannot replace files with harmful links.
What Should Users Do?
According to Microsoft, the new inetpub folder should not be deleted, regardless of whether IIS is running on the device. The folder is a necessary part of the update that enhances protection against the CVE-2025-21204 vulnerability. It’s important to note that this folder takes up very little space and does not affect system performance. Therefore, it’s best to leave it alone and allow the update to function as intended.
What Undercode Say:
The release of the inetpub folder might initially seem like a cause for concern, especially when users see it on their devices without understanding its purpose. However, Microsoft’s decision to create this folder as part of the patch for CVE-2025-21204 is a solid move toward increasing security. By preventing attackers from exploiting the vulnerability through file manipulation and link following, this simple addition significantly strengthens the system’s defenses.
For most users, the presence of this folder is largely invisible and does not affect their day-to-day activities. The inetpub folder is essentially a protective measure, designed to safeguard your system from potential attackers seeking to exploit vulnerabilities in the Windows Update Stack.
Additionally, it’s important to remember that these kinds of changes are part of ongoing efforts to improve system security, especially in an age where cyberattacks are increasingly sophisticated. The relatively low impact on system resources makes it a smart move for Microsoft to implement this update, even if it initially raises eyebrows.
From an operational standpoint, this patch highlights the ongoing tension between system security and user experience. While most users may never interact with the inetpub folder, it is an essential part of the protective framework that helps mitigate potential threats. The fact that Microsoft has clarified its purpose reassures users, but as always, regular updates and patches are vital to maintaining system security.
Fact Checker Results:
- Folder Creation: The inetpub folder is introduced as part of a critical patch for CVE-2025-21204, a privilege escalation vulnerability in the Windows Update Stack.
- Impact on Users: Users should not delete the folder as it’s integral to the patch’s security features.
- Security Benefit: The folder is a safeguard to prevent attackers from exploiting the link-following flaw, ensuring stronger system defenses.
References:
Reported By: www.malwarebytes.com
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