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Hacking Windows 2000
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As this edition went to press, a Win 2000-compatible SSH server was just released at http:// marvincriadvantagecom/caspian/Software/SSHD-NT/defaultphp Secure Shell (SSH) has been a mainstay of secure remote management on UNIX-based systems for many years, and it will be interesting to see if this new distribution will prove a robust command-line alternative to Terminal Server for remote management of Win 2000 (see The Secure Shell FAQ at http://wwwemployeesorg/ ~satch/ssh/faq/ssh-faqhtml for general information on SSH)
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NetBus keystroke logger works fine under Win 2000, as does the Invisible Keylogger Stealth (IKS), both discussed in 5
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Win 2000 provides new security management tools that centralize much of the disparate functionality found in NT 4 These utilities are excellent for hardening a system or just for general configuration management to keep entire environments tuned to avoid holes
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One of the most powerful new tools available under Win 2000 is Group Policy, which we have touched upon several times in this chapter Group Policy Objects (GPOs) can be stored in the AD or on a local computer to define certain configuration parameters on a domainwide or local scale GPOs can be applied to sites, domains, or organizational units (OUs) and are inherited by the users or computers they contain (called members of that GPO) GPOs can be viewed and edited in any MMC console window (Administrator privilege is required) The GPOs that ship with Win 2000 are Local Computer, Default Domain, and Default Domain Controller Policies By simply running Start | gpeditmsc, the Local Computer GPO is called up Another way to view GPOs is to view the Properties of a specific directory object (domain, OU, or site), and then select the Group Policy tab, as shown in the next illustration This screen displays the particular GPO that applies to the selected object (listed by priority) and whether inheritance is blocked, and allows the GPO to be edited
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Editing a GPO reveals a plethora of security configurations that can be applied to directory objects Of particular interest is the Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options node in the GPO There are more than 30 different parameters here that can be configured to improve security for any computer objects to which the GPO is applied These parameters include Additional Restrictions For Anonymous Connections (the RestrictAnonymous setting), LanManager Authentication Level, and Rename Administrator Account, three important settings that were only accessible via several disparate interfaces under NT 4 The Security Settings node is also where Account Policies, Audit Policies, and Event Log, Public Key, and IPSec policies can be set By allowing these best practices to be set at the site, domain, or OU level, the task of managing security in large environments is greatly reduced The Default Domain Policy GPO is shown in Figure 6-2 GPOs seem like the ultimate way to securely configure large Win 2000 domains However, you can experience erratic results when enabling combinations of local and domain-level policies, and the delay before Group Policy settings take effect can also be frustrating Using the secedit tool to refresh policy immediately is one way to address this delay (secedit is discussed in more detail in the next section) To refresh policy using secedit, open the Run dialog box and enter
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secedit /refreshpolicy MACHINE_POLICY
To refresh policies under the User Configuration node, type
secedit /refreshpolicy USER_POLICY
6:
Hacking Windows 2000
Figure 6-2
The Default Domain Policy GPO
Security Configuration Tools
Related to the Group Policy feature is the security configuration toolset, which consists of the Security Configuration and Analysis and Security Templates utilities The Security Configuration and Analysis tool allows administrators to audit local system configurations for compliance with a defined template and to reconfigure any settings that don t comply It is available as an MMC snap-in, or there is a command-line version (secedit) This is a powerful mechanism for quickly determining if a system meets baseline security requirements Unfortunately, the analysis and configuration is only applicable to local systems and does not have domainwide scope The secedit utility can be used in logon batch scripts to distribute configuration and analysis to remote systems, but this is still not as smooth as the Group Policy feature in distributed environments Fortunately, security templates can be imported into a Group Policy Thus, any domain, OU, or site to which the GPO is applied will receive the security template settings To import a security template into a Group Policy, simply right-click on the Computer Configuration\Windows Settings\Security Settings node and select Import from the context menu The Import function defaults to the %windir%\security\templates directory where the standard set of 11 security templates is stored In fact, these 11 templates comprise the Security Templates tool itself The template files come in varying security levels that can be used in conjunction with the Security
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