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Suggested Practices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349

4

Take a Practice Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349

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Don t change default security settings on system directories and registry keys without thorough knowledge. For example, the HKLM system registry subtree is protected because, by default, only members of the Administrators group in the Builtin folder and local system account have Full Control of this subtree. This is appropriate. Providing privileged access to other groups reduces the security. If this subtree is compromised, some resource might fail to start or some other problem might occur. Use software restriction policies. Software restriction policies can prevent the use of tools and other files, or they can specify explicitly who can use them.

Server Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351

Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 352

Secure the Use of Specific Tools In addition to commonsense security restrictions, the requirements for securing many administrative tools are well documented Exam ples of securing primary administration tools, as well as some other administration tools, are documented in this section However, all administrative tools should be examined to find ways to secure their use In addition to developing security around specific tools, consider designating the type of tool that can be used or developing guidelines around how a tool is used, such as determining use based on where a tool is used from For example, the use of Microsoft Management Console tools across a firewall would require opening up multiple ports on the firewall and therefore reducing overall network security.

There are two scenarios in which severing the default file associations is useful to IT professionals The first is when you're concerned about users accidentally running scripts that they receive as mail attachments If you don't have a virus filter on your mail server and you're not using a mail client like Outlook 2002, which blocks dangerous attachments, you can break the associations between the script files' extensions and the program class that opens them Appendix A, "File Associations," describes how Windows XP associates file extensions with program classes In the first scenario, you'd break the file association between the vbs and js file extensions and Windows Script Host To do that, clear the default values of HKCR\vbs and HKCR\js This isn't foolproof, however, because you can't break other dangerous file associations without affecting users' ability to use the operating system.

Lesson 1: Enabling and Referencing WSE 3.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354

An argument can even be made for not using these tools on the LAN and to administer sensitive servers, because doing so requires that more services be enabled on a server and the server can be better secured if these services are not running Possible alternatives to MMC use might be using terminal services when working remotely, or to require the use of VPNs when administering servers remotely Using VPNs would obviate the need to open up extensive ports on the firewall Secure Administrative Tools That Use MMCs Many Windows Server 2003 administra tion tools use the Microsoft Management Console The most effective way of securing these tools is by limiting access to them Then, to assist administrators, instead of using default Administrative tools for all administration, develop custom MMCs for use by specific administrative roles.

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