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2 Once the connection is made, you authenticate as your compromised Guest user This is done by selecting Connections | Bind, making sure the Domain check box is selected with the proper domain name, and entering Guest s credentials, as shown next:
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3 Now that an authenticated LDAP session is established, you can actually enumerate users and groups Open View | Tree and enter the root context in the ensuing dialog box For example, DC=labfarce2, DC=org is shown here:
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4 A node appears in the left pane Click the plus symbol to unfold it to reveal the base objects under the root of the directory 5 Double-click the CN=Users and CN=Builtin containers They will unfold to enumerate all the users and all the built-in groups on the server, respectively The Users container is displayed in Figure 3-10 How is this possible with a simple guest connection Certain legacy NT4 services (such as Remote Access Service and SQL Server) must be able to query user and group objects within AD The Windows 2000 AD installation routine (dcpromo) prompts whether the user wants to relax access permissions on the directory to allow legacy servers to perform these lookups, as shown in Figure 3-10 If the relaxed permissions are selected at installation, user and group objects are accessible to enumeration via LDAP Performing LDAP enumeration in Linux is equally as simple, using either LUMA (http://lumasourceforgenet/) or the Java-based JXplorer (wwwjxplorerorg/) Both of these tools are graphical, so you ll have to be within X Windows to use them Alternatively, there is ldapenum (http://sourceforgenet/projects/ldapenum), a command-line Perl script which can be used in both Linux and Windows
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Figure 3-10 The Active Directory Administration Tool, ldpexe, enumerates Active Directory users
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First and foremost, you should filter access to ports 389 and 3268 at the network border Unless you plan on exporting AD to the world, no one should have unauthenticated access to the directory To prevent this information from leaking out to unauthorized parties on internal semitrusted networks, permissions on AD will need to be restricted The difference between legacy-compatible mode (read less secure ) and native Windows 2000 essentially boils down to the membership of the built-in local group Pre-Windows 2000 Compatible Access The Pre-Windows 2000 Compatible Access group has the default access permission to the directory shown in Table 3-4
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Enumeration
Object Directory root User objects Group objects
Permission List Contents List Contents, Read All Properties, Read Permissions List Contents, Read All Properties, Read Permissions
Applies To This object and all children User objects Group objects
Table 3-4 Permissions on Active Directory User and Group Objects for the Pre-Windows 2000 Compatible Access Group
The Active Directory Installation Wizard automatically adds Everyone to the PreWindows 2000 Compatible Access group if you select the Permissions Compatible with Pre-Windows 2000 Servers option on the screen shown in Figure 3-11 The special Everyone group includes authenticated sessions with any user By removing the Everyone group from Pre-Windows 2000 Compatible Access (and then rebooting the domain controllers), the domain operates with the greater security provided by native Windows 2000 If you need to downgrade security again for some reason, the Everyone group can be re-added by running the following command at a command prompt:
net localgroup "Pre-Windows 2000 Compatible Access" everyone /add
For more information, find KB Article Q240855 at http://supportmicrosoftcom/ kb/240855 The access control dictated by membership in the Pre-Windows 2000 Compatible Access group also applies to queries run over NetBIOS null sessions To illustrate this point, consider the two uses of the enum tool (described previously) in the following example The first time, it is run against a Windows 2000 Advanced Server machine with Everyone as a member of the Pre-Windows 2000 Compatible Access group:
C:\>enum -U corp-dc server: corp-dc setting up session success getting user list (pass 1, index 0) success, got 7 Administrator Guest IUSR_CORP-DC IWAM_CORP-DC krbtgt NetShowServices TsInternetUser cleaning up success
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