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You could disallow zone transfers entirely by simply unchecking the Allow Zone Transfers box, but it is probably more realistic to assume that backup DNS servers will need to be kept up to date, so we have shown a less restrictive option here

tifier (RID), and it is predefined for built-in NT/2000 users and groups like Administrator or Guest For example, the Administrator user s RID is always 500, and the Guest user s is 501 Armed with this tidbit, a hacker can use sid2user and the known SID string appended with an RID of 500 to find the name of the Administrator s account (even if it s been renamed):

3:

C:\>sid2user \\192168233 5 21 8915387 1645822062 18198280005 500 Name is godzilla Domain is WINDOWSNT Type of SID is SidTypeUser

Past versions of Windows (up to and including Windows 2000) came configured by default to allow zone transfers to any server However, thanks in part to the depiction of this issue in past editions of Hacking Exposed, Microsoft released its later server versions with a default DNS server setting that blocks zone transfers to unauthorized systems Hats off to Redmond! Blocking BIND versionbind Requests An excellent BIND hardening guide is available by Rob Thomas at wwwcymrucom/Documents/secure-bind-templatehtml This guide includes a number of different methods to secure BIND including how to change/disable queries for versionbind Disabling DNS Cache-Snooping Luis Grangeia has written a paper (wwwrootsecurenet/ content/downloads/pdf/dns_cache_snoopingpdf) that further describes DNS cache snooping and provides methods to protect against it

Note that the S-1 and hyphens are omitted Another interesting factoid is that the first account created on any NT/2000 local system or domain is assigned an RID of 1000, and each subsequent object gets the next sequential number after that (1001, 1002, 1003, and so on RIDs are not reused on the current installation) Thus, once the SID is known, a hacker can basically enumerate every user and group on an NT/2000 system, past and present Sid2user/user2sid will even work if RestrictAnonymous is enabled (see preceding), as long as port 139 is accessible Scary thought! See the sample in the section called Let Your Scripts Do the Walking to see what such a script might look like

Popularity: Simplicity: Impact: Risk Rating: 1 3 7 3

User Enumeration Countermeasures U NetBIOShave discussed the countermeasures for these techniques, we will spend little Since we

Trivial File Transfer Protocol (TFTP) is a UDP-based protocol for unauthenticated quick and dirty file transfers commonly run on UDP port 69 The premise of TFTP is that in order to pull a file from a server, you have to know the file name This can be a double-edged sword for an attacker because the results are not always guaranteed For instance, if the file has been renamed by even a single character, the attacker s request will fail Copying Files via a Linux TFTP Server Although it barely qualifies as an enumeration trick due to the severity of the information gathered, the granddaddy of all UNIX/Linux enumeration tricks is getting the /etc/passwd file, which we ll discuss at length in 5 However, it s worth mentioning here that one way to grab the passwd file is via TFTP It s trivial to grab a poorly secured /etc/passwd file via TFTP, as shown next:

time going over them again here Blocking queries directed against the NetBIOS name table, such as nbtstat and nbtscan dumps, is best accomplished by denying access to the NetBIOS-specific TCP and UDP ports 135 159 and 445 Without this precaution, the only way to prevent user data from appearing in NetBIOS name table dumps is to disable the Alerter and Messenger services on individual hosts The startup behavior for these services can be configured through the Services Control Panel Blocking null session information obtained through tools such as DumpSec is done by setting the appropriate value (either REG_DWORD 1 for NT4, or 2 for 2000) for the RestrictAnonymous Registry key, found under HKLM\SYSTEM\CurrentControlSet\ Control\LSA More information about RestrictAnonymous is found in the preceding section on null sessions There is no way to block sid2user/user2sid attacks unless access to TCP 139 and 445 is disabled

[root$]tftp 19216820234 tftp> connect 19216820234 tftp> get /etc/passwd /tmp/passwdcracklater tftp> quit

3:

Popularity: Simplicity: Impact: Risk Rating: 8 9 5 73