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-----------------------------------------------------------------------------NETLOGON Disk Logon server share Test Disk Public access The command completed successfully
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Three other good share-enumeration tools from the NTRK are rmtshare, srvcheck, and srvinfo (using the s switch) Rmtshare generates output similar to net view Srvcheck displays shares and authorized users, including hidden shares, but it requires privileged access to the remote system to enumerate users and hidden shares Srvinfo s s parameter lists shares along with a lot of other potentially revealing information Enumerating NetBIOS Shares with DumpSec (Formerly DumpACL) One of the best tools for enumerating NT shares (and a whole lot more) is DumpSec (formerly DumpACL), shown in Figure 3-1 It is available free from Somarsoft (http://wwwsomarsoftcom) Few tools deserve their place in the NT security administrator s toolbox more than DumpSec it audits everything from file system permissions to services available on remote systems Basic user information can be obtained even over an innocuous null connection, and it can be run from the command line, making for easy automation and scripting In Figure 3-1, we show DumpSec being used to dump share information from a remote computer
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Hacking Exposed: Network Security Secrets and Solutions
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DumpSec reveals shares over a null session with the target computer
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Scanning for Shares with Legion and NAT Opening null connections and using the preceding tools manually is great for directed attacks, but most hackers will commonly employ a NetBIOS scanner to check entire networks rapidly for exposed shares One of the more popular ones is called Legion (available on many Internet archives), shown next
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Enumeration
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Legion can chew through a Class C IP network and reveal all available shares in its graphical interface Version 21 includes a brute-force tool that tries to connect to a given share by using a list of passwords supplied by the user For more on brute-force cracking of Windows 9x and NT, see s 4 and 5, respectively Another popular Windows share scanner is the NetBIOS Auditing Tool (NAT), based on code written by Andrew Tridgell (NAT is available through the Hacking Exposed web site, http://wwwhackingexposedcom) Neon Surge and Chameleon of the now-defunct Rhino9 Security Team wrote a graphical interface for NAT for the command-line challenged, as shown in Figure 3-2 NAT not only finds shares, but also attempts forced entry using user-defined username and password lists
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Miscellaneous NT/2000 Network Enumeration Tools
A few other NT network information enumerators bear mention here: epdump from Microsoft (epdump can be found at http://wwwntshopnet/security/tools/defhtm), getmac and netdom (from the NTRK), and netviewx by Jesper Lauritsen (see http://wwwibtkudk/jesper/NTtools/) Epdump queries the RPC endpoint mapper and shows services bound to IP addresses and port numbers (albeit in a very crude form) Using a null session, getmac displays the MAC addresses and device names of network interface cards on remote machines This can yield useful network information to an attacker casing a system with multiple network interfaces Netdom is more useful, enumerating key information about NT domains on a wire, including domain membership and the identities of
Figure 3-2
The NetBIOS Auditing Tool (NAT) with graphical interface and command-line output
Hacking Exposed: Network Security Secrets and Solutions
Backup Domain Controllers Netviewx is a similarly powerful tool for listing nodes in a domain and the services they are running We often use netviewx to probe for the NT Remote Access Service (RAS) to get an idea of the number of dial-in servers that exist on a network, as shown in the following example The D syntax specifies the domain to enumerate, while the T specifies the type of machine or service to look for
C:\>netviewx -D CORLEONE -T dialin_server VITO,4,0,500,nt%workstation%server%domain_ctrl%time_source%dialin_server% backup_browser%master_browser," Make him an offer he can't refuse "
The services running on this system are listed between the % characters Netviewx is also a good tool for choosing non-domain controller targets that may be poorly secured Winfo from Arne Vidstrom at http://wwwntsecuritynu extracts user accounts, shares, and interdomain, server, and workstation trust accounts it ll even automate the creation of a null session if you want by using the n switch Nbtdump from David Litchfield of Cerberus Information Security (http://www cerberus-infoseccouk/toolsnshtml) creates null sessions, performs share and user account enumeration, and spits the output into a nice HTML report The Whole Enumeration Enchilada: enum It took the Razor team from Bindview to throw just about every NetBIOS enumeration feature into one tool, and then some They called it enum fittingly enough for this chapter and it s available from http://razor bind- viewcom The following listing of the available command-line switches for this tool demonstrates how comprehensive it is:
D:\Toolbox>enum usage: enum [switches] [hostname|ip] -U: get userlist -M: get machine list -N: get namelist dump (different from -U|-M) -S: get sharelist -P: get password policy information -G: get group and member list -L: get LSA policy information -D: dictionary crack, needs -u and -f -d: be detailed, applies to -U and -S -c: don't cancel sessions -u: specify username to use (default "") -p: specify password to use (default "") -f: specify dictfile to use (wants -D)
Enum even automates the setup and teardown of null sessions Of particular note is the password policy enumeration switch, -P, which tells remote attackers whether they can remotely guess user account passwords (using D, -u, and f) until they find a weak one We ll talk some more about enum in the next section on enumerating NT/2000 user accounts
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