Tools for Auditing Software Updates
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On the Which Computers Do You Want To Scan page, type the domain or workgroup name or the IP address range you want to scan . To speed up the scanning process, clear all check boxes except for Check For Security Updates . If you have a WSUS server on your network, you can further speed up the process by selecting the Advanced Update Services Options check box and the Scan Using Assigned Update Services Servers Only option to prevent unmanaged computers from being scanned . Figure 23-4 shows MBSA configured to scan the contoso .com domain for security updates .
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FIgURE 23-4 MBSA configured to scan a subnet
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Click Start Scan . While MBSA performs the scan, it will keep you updated on the progress . After the scan is completed, the View Security Report page appears, listing the computers that were scanned .
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If you do not have sufficient credentials on a computer, MBSa will display the Ip
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address of the computer with the following message: User Is Not an administrator On The Scanned Machine.
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Missing security updates are marked by a red X, and missing service packs or update rollups are marked with a yellow X . A green check mark denotes a scan that was completed successfully with no missing updates found . Scan reports are stored on the computer from which you ran MBSA in the %UserProfile%\SecurityScans folder . An individual security report is created for each computer that is scanned .
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CHapTER 23 Managing Software Updates
During the scanning process, MBSA uses NetBIOS over Transmission Control Protocol/ Internet Protocol (TCP/IP) and Common Internet File System (CIFS) protocols to connect to computers, which requires TCP ports 135, 139, and 445 and User Datagram Protocol (UDP) ports 137 and 139 . If a firewall blocks these ports between you and the target computers or if the computers have Internet Connection Firewall enabled and these ports have not been opened, you will not be able to scan the computers . At the beginning of the scan, MBSA must retrieve an updated MBSA detection catalog (Wsusscan .cab) that provides information about updates and security vulnerabilities . By default, this file is retrieved from the Microsoft Web site at http://go.microsoft.com/fwlink/ LinkId=39043 and includes every current update available from Microsoft . If the computer is configured as a WSUS client, it will retrieve the file from your WSUS server instead .
Scanning a large network should be done on a regular basis to find computers that have not been properly updated . However, scanning a large network is a time-consuming process . Although the MBSA console is the most efficient way to scan a network interactively, the MBSACLI command-line tool provides a way to script an analysis . By using scripts, you can schedule scanning to occur automatically, without your intervention . This way, you can have MBSACLI generate a report that you can refer to on demand .
t s convenient to schedule MBSaCLI scans after business hours so that you don t consume network resources during working hours; however, if you do this, you
won t be able to scan computers that users take home. It s a good idea to schedule scans at various times during the day. another good reason to schedule scans by using MBSaCLI is that you can scan from multiple points on your network. For example, if your organization has five remote offices, it is more efficient to scan each remote office by using a computer located in that office. This improves performance, reduces the bandwidth used on your WaN, and allows you to scan computers even if a perimeter firewall blocks the ports that MBSaCLI uses to scan.
As with the MBSA graphical console, you need administrative access to use MBSACLI to scan a computer . In a domain environment, simply log on to your computer using an account that has sufficient privileges . Otherwise, you can provide credentials at the command line by using the /u and /p parameters . However, you should avoid typing credentials in a script because the script can be compromised, allowing an attacker to gain privileges on remote computers .