Dec 12, 2019 How to perform an offline scan using WUA and PowerShell. MBSA, WUA, offline scan. Q and A (7) Verified on the following platforms. MBSA 2.1.1 is a minor upgrade to add support for Windows 7 and Windows Server 2008 R2.
Windows Update Agent (WUA) can be used to scan computers for security updates without connecting to Windows Update or to a Windows Server Update Services (WSUS) server, which enables computers that are not connected to the Internet to be scanned for security updates.
- Customers using the offline catalog (WSUSSCN2.CAB file) will no longer need to place the catalog file in a version-specific path since the “2.1” cache directory has been removed. The file should now be placed into C: Documents and Settings Local Settings Application Data Microsoft MBSA Cache.
- The offline catalog must be a.cab file signed by Microsoft. The default offline catalog is Wsusscan.cab, which is downloaded from the Microsoft Web site. When this parameter is not used, Wsusscan.cab is downloaded from the Microsoft Web site if it is different from the locally cached version. Using this parameter prevents a newer file from.
- The solution is to use mbsa as a standalone software. Despite Microsoft forces you to install a full version of the software, msba can work just using three components: Mbsacli.exe (the executable itself) wsusscn2.dll; wsusscn2.cab (the file containing the offline updates catalog).
Offline scanning for updates requires the download of a signed file, WsusScan.cab, from Windows Update. Offline scanning for security updates that use Windows Installer require that Windows Installer 3.1 be installed on the computer.
The WsusScan.cab file is a cabinet file that is signed by Microsoft. This file contains security updates. Computers that are not connected to the Internet can be scanned and then updated for the updates in the WsusScan.cab file.
The WsusScan.cab file contains the security updates, update rollups, and service packs that are available from Microsoft Update. The WsusScan.cab file is automatically updated when a security update, update rollup, or service pack is added, removed, or revised on the Microsoft Updates site. The latest WsusScan.cab is available for download at the following location: Download WsusScan.cab
After you download the latest WsusScan.cab, the file can be provided to the AddScanPackageService method, and the WUA API can be used to search the offline computer for security updates. WUA validates that the WsusScan.cab is signed by a valid Microsoft certificate before running an offline scan.
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Windows Installer version 3.1 must be installed to search for security updates that use Windows Installer technology. If Windows Installer version 3.1 is not installed, WUA may not return the entire set of updates that are applicable to an offline computer system.
Example
The following example uses the WsusScan.cab file to scan a computer and displays updates that are missing.
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