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We have thus far detailed the steps an intruder might take to enumerate network, user, and application information using manual methods Understandably, many who have read to this point may be a little anxious to start checking the networks they manage for some of these holes However, this can be a daunting task on any network with more than a handful of servers Fortunately, many of the tools we have presented in this section can be run from the command line and are thus easily automated using simple batch scripts or other tools Here s a simple example using the user2sid/sid2user tool detailed earlier To set up this script, we first determine the SID for the target system using user2sid over a null session as shown previously Recalling that NT/2000 assigns new accounts an RID beginning with 1000, we then execute the following loop using the NT/2000 shell command FOR and the sid2user tool (see earlier) to enumerate up to 50 accounts on a target:
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C:\>for /L %i IN (1000,1,1050) DO sid2user \\acmepdc1 5 21 1915163094 1258472701648912389 %I >> userstxt C:\>cat userstxt Name is IUSR_ACMEPDC1 Domain is ACME Type of SID is SidTypeUser Name is MTS Trusted Impersonators Domain is ACME Type of SID is SidTypeAlias
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This raw output could be sanitized by piping it through a filter to leave just a list of usernames Of course, the scripting environment is not limited to the NT shell Perl, VBScript, or whatever is handy will do As one last reminder before we move on, realize that this example will successfully dump users as long as TCP port 139 or 445 is open on the target, RestrictAnonymous notwithstanding Using the information presented to this point, an attacker can now turn to active NT system penetration as we describe in 5, and Win 2000 attacks as we discuss in 6
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Hacking Exposed: Network Security Secrets and Solutions
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NOVELL ENUMERATION
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NT/2000 is not alone with its null session holes Novell s NetWare has a similar problem actually it s worse Novell practically gives up the information farm, all without authenticating to a single server or tree NetWare 3x and 4x servers (with Bindery context enabled) have what can be called the Attach vulnerability, allowing anyone to discover servers, trees, groups, printers, and usernames without logging in to a single server We ll show you how easily this is done, and then make recommendations for plugging up these information holes
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Browsing the Network Neighborhood
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The first step to enumerating a Novell network is to learn about the servers and trees available on the wire This can be done a number of ways, but none more simply than through Windows 95/98/NT s Network Neighborhood This handy network browsing utility will query for all Novell servers and NDS trees on the wire (see Figure 3-7), although you cannot drill down into the Novell NDS tree without logging in to the tree it-
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Figure 3-7
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The Windows Network Neighborhood enumerates Novell servers and trees, respectively, on the wire
3:
Enumeration
self While this by itself is not threatening information, it represents the baby steps leading to marathon racing
Novell Client32 Connections
Popularity: Simplicity: Impact: Risk Rating: 7 10 1 6
Novell s NetWare Services program runs in the system tray and allows for managing your NetWare connections through the NetWare Connections option, as shown next
This capability can be incredibly valuable in managing your attachments and logins More importantly, however, once an attachment has been created, you can retrieve the NDS tree the server is contained in, the connection number, and the complete network address, including network number and node address, as shown in Figure 3-8
Hacking Exposed: Network Security Secrets and Solutions
Figure 3-8
Novell s NetWare Connections utility displays the NDS tree the server is contained in, the connection number, and the complete network address, including network number and node address
This can be helpful in later connecting to the server and gaining administrative privilege (see 7)
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