Other New SCM Features in .NET framework

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Other New SCM Features
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Prior to Windows Vista and Windows Server 2008, the only way for a client to determine whether a service had changed its status, or been created or deleted, was to use the service query application programming interface (API), QueryServiceStatusEx function, and poll the status of the service. Having to constantly poll for changed status was not efficient. Windows Vista introduced a new API, NotifyServiceStatusChange, which allows the SCM to notify registered clients when a specific service changes status. This means that applications that monitor services can now receive notifications when services change status, making it far easier to write management tools. Services can also register to get preshutdown notifications to give them a longer time to prepare for a system shutdown. And shutdown can take into account each service s dependencies and shut them down (if configured) in a more orderly manner. SCM was also enhanced to detect and recover from nonfatal errors better. In early versions of Windows, it took a complete crash of the service to kick off a recovery event. Now, memory leaks, slow processing, and other issues can initiate a recovery event. Microsoft has spent significant effort to make Windows services more secure. While no software as complex as Windows will ever be without security bugs, Windows Vista has already proven to be more resistant to newly announced security vulnerabilities. Check out the security blog of Microsoft s Jeff Jones (http://blogs.technet.com/security/archive/tags/Studies/default.aspx) to see what I mean. We should expect Windows Server 2008 to be similarly more resilient.
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Part I:
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Windows Security Fundamentals
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Microsoft understands the security risk with each running service. To that end, the development team has analyzed and improved the security of all included Windows services beyond the levels in previous Windows operating systems. Still, you as the administrator should do some things that can improve the situation even further. Administrators should take the following steps to minimize the risk of malicious exploitation. These steps should be implemented in security policies and guidelines.
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To begin to secure services, an administrator must understand and document what services should be running on each of their computers or types of computers. Without a service list and an explanation of what that service does, it is difficult to remove unneeded services. Many built-in and third-party tools can provide you with a list of services per computer. The easiest program to query a single computer is the Service Controller (Sc.exe) tool. It can be used to query local and remote services and return all sorts of individual service information, along with allowing the administrator to modify service information (privileges, status, start-up type, and so on). The Windows Management Instrumentation (WMI) and Windows Management Instrumentation Command-line (WMIC) allow service querying and scripting. For example, to retrieve services information for a server called Server1, type the following at a command prompt:
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wmic /output:c:\services.htm /node:server1 service list full / format:htable
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Use Microsoft Internet Explorer to examine the resulting C:\services.htm file. Other tools, such as Microsoft System Management Server (SMS) or System Center Configuration Manager (http://www.microsoft.com/smserver/default.mspx) are excellent choices for returning detailed and summarized list of services. Service inventories should be run on a periodic basis, according to the risk-acceptance level of the organization. If you cannot inventory all computer systems, start with the highest risk and most valuable systems first, and the systems that connect to them.
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Minimize Running Services
The next step is to decide what services are really needed, and remove or disable the rest. This is the single biggest step you can take to minimize malicious risk from services. Every disabled and remove service is one less attack vector. 11, Securing Server Roles, goes into depth on how to configure services using server roles and the Security Configuration Wizard (SCW). In general, be cautious in disabling or modifying Windows default services outside of the Server Manager and SCW. In most instances, Microsoft has determined what services are most likely to be needed in most environments for particular roles, and configured them to start or not start accordingly. What is enabled has been relatively well protected using the mechanisms discussed here. What you should be looking for are services that are obviously not needed or used, or against company policy. A common example of the former is the DHCP Cli-
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