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Understanding Window Server Updates and Cumulative Updates
Windows Updates vs. Cumulative Updates
- Windows Updates: These include both security and non-security updates, typically delivered through Windows Update or WSUS. They may be individual fixes for issues, including driver updates, performance improvements, or critical updates.
- Cumulative Updates: Starting with Windows 10 and Windows Server 2016, Microsoft adopted a model of cumulative updates. This means that each monthly update (Patch Tuesday) includes all previous fixes and improvements for the OS, including security patches. In other words, you don't need to install previous updates if you install the most recent cumulative update, as it includes everything from earlier updates.
For example:
- A Cumulative Update (CU) in August might include the fixes for vulnerabilities from earlier months, plus new fixes released in that same month.
- Security-only updates (which are available for certain versions) only include security patches and are released in addition to the cumulative updates.
In your case, the update KB5041578 that addresses CVE-2024-38193 is likely part of a cumulative update package. That means it might not show up as a standalone update if you've already installed the cumulative update that includes it.
How Cumulative Updates are Packaged
Each cumulative update contains all of the patches released previously for that version of Windows Server. So, if your server is running build 17763.6414 (a Windows Server 2019 build), then the update you're looking for (KB5041578) could already be included in a subsequent cumulative update.
- Windows Update History: If you don't see KB5041578 listed, it could be that it is embedded in a cumulative update package, and it isn't listed separately in the update history.
- Installed Updates via PowerShell or CMD: Similarly, running commands like wmic qfe list or Get-HotFix may not list cumulative updates separately unless you filter specifically for the KB number.
3. Finding Which Update Was Installed
If you want to check whether a specific update, such as KB5041578, has been installed, follow these steps:
Method 1: Using PowerShell
You can list all installed updates and filter by the KB number:
Get-HotFix | Where-Object {$_.Description -like "*KB5041578*"}
Method 2: Using Command Prompt (WMIC)
To list all installed updates:
wmic qfe list full
Then search for the relevant KB number in the list.
Method 3: Checking the Update History
The update history can be accessed via:
- Settings > Update & Security > Windows Update > View update history
- You can also check Control Panel > Programs > View installed updates to find installed updates, but cumulative updates might not be listed individually.
4. Verify if a Cumulative Update Includes the Patch
To ensure that KB5041578 (which addresses CVE-2024-38193) is included, you'll need to check which Cumulative Update includes this specific fix.
You can do this by searching the Microsoft Security Update Guide or release notes for Windows Server 2019 for each cumulative update after August 2024 (when KB5041578 was released). Here's the process:
- Visit Windows Server Update History and identify the Cumulative Updates released after August 2024.
- For example, if you see a Cumulative Update released in September 2024, check the release notes to confirm if it includes KB5041578.
Conclusion
- Yes, it's safe to assume that the update related to CVE-2024-38193 (KB5041578) is likely included in a later Cumulative Update for Windows Server 2019, especially if the update doesn't show up separately in your update history.
- To prove the update has been installed, you can check the update history, use PowerShell commands to list installed updates, or verify the presence of the fix by looking for the cumulative update released after August 2024.