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Network access: Table 3-3 shows the new XP/Server 2003 and later settings and our recommended configurations Looking at Table 3-3, it s clear that the main additional advantage gained by Windows XP/Server 2003 and later is more granular control over resources that are accessible via null sessions Providing more options is always better, but we still liked the elegant simplicity of Windows 2000 s RestrictAnonymous = 2 because null sessions simply were not possible Of course, compatibility suffered, but hey, we re security guys, okay Microsoft would do well to revive the harshest option for those who want to be hardcore At any rate, we were unable to penetrate the settings outlined in Table 3-3 using current tools Urity of SecurityFridaycom published a research article in August 2004 noting that even under Windows XP SP2, the \pipe\browser named pipe remains accessible via null session, and that subsequently, the lanmanserver and lanmanworkstation interfaces can be enumerated via the NetrSessionEnum and NetrWkstaUserEnum MSRPC calls, enabling remote listing of local and remote logon usernames This is reportedly blocked on Windows XP SP3, Windows Server 2003, and Windows 2008

rwho 19216820234 root localhost:ttyp0 jack beanstalk:ttyp1 jimbo 19216820277:ttyp2 Apr 11 09:21 Apr 10 15:01 Apr 10 17:40

XP/Server 2003 Setting Network access: Allow anonymous SID/ name translation Network access: Do not allow anonymous enumeration of SAM accounts Network access: Do not allow anonymous enumeration of SAM accounts and shares Network access: Let Everyone permissions apply to anonymous users Network access: Named pipes that can be accessed anonymously

3:

Rusers returns similar output with a little more information by using the l switch, including the amount of time since the user has typed at the keyboard:

Recommended Con guration Disabled Blocks user2sid and similar tools Enabled Blocks tools that bypass RestrictAnonymous = 1 Enabled Blocks tools that bypass RestrictAnonymous = 1 Disabled Although this looks like RestrictAnonymous = 2, null sessions are still possible Depends on the system role You may consider removing SQL\QUERY and EPMAPPER to block SQL and MSRPC enumeration, respectively Depends on the system role Most secure is to leave this empty Depends on the system role Empty is most secure; the default is COMCFG, DFS$

rusers l 19216820234 root 19216820234:tty1 root 19216820234:ttyp0 Apr 10 18:58 Apr 10 18:59 :51 :02 (:00)

Network access: Remotely accessible Registry paths Network access: Shares that can be accessed anonymously

Another classic user-enumeration technique takes advantage of the lingua franca of Internet mail delivery, the Simple Mail Transfer Protocol (SMTP) SMTP provides two built-in commands that allow enumeration of users: VRFY, which confirms names of valid users, and EXPN, which reveals the actual delivery addresses of aliases and mailing lists Although most companies give out email addresses quite freely these days, allowing this activity on your mail server can provide intruders with valuable user information and opens the possibility of forged mail

Table 3-3

Outlet devices: Lampholders Any Permitted Type Receptacle 15 Max A Rating Maximum load Permissible load

telnet 19216820234 25 Trying 19216820234 Connected to 19216820234 Escape character is '^]' 220 mailbigcorpcom ESMTP Sendmail 887/887; Sun, 11 Apr 1999 10:08:49 -0700 vrfy root 250 root <root@bigcorpcom> expn adm 250 adm <adm@bigcorpcom> quit 221 mailbigcorpcom closing connection

Ensure the Registry Is Locked Down Anonymous access settings do not apply to remote Registry access (although as you have seen, there is a separate setting for this in Windows XP/Server 2003 s Security Policy) Make sure your Registry is locked down and is not accessible remotely The appropriate key to check for remote access to the Registry is HKLM\System\CurrentControlSet\Control\SecurePipeServer\Winreg and its associated subkeys If this key is present, remote access to the Registry is restricted to administrators It is present by default on Windows NT Server products The optional AllowedPaths subkey defines specific paths into the Registry that are allowed access, regardless of the security on the Winreg Registry key It should be checked as well For further reading, find Microsoft Knowledge Base Article Q153183 at http://supportmicrosoftcom/ kb/153183 Also, use great tools such as DumpSec to audit yourself, and make sure there are no leaks

This is another one of those oldies but goodies that should just be turned off versions of the popular SMTP server software sendmail (http://wwwsendmailorg) greater than 8 offer syntax that can be embedded in the mailcf file to disable these commands or require authentication Other SMTP server implementations should offer similar functionality if they don t, consider switching vendors! Of course, the granddaddy of all UNIX enumeration tricks is getting the /etc/passwd file, which we ll discuss at length in 8 However, it s worth mentioning here that one of the most popular ways to grab the passwd file is via TFTP (Trivial File Transfer Protocol):

Popularity: Simplicity: Impact: Risk Rating: 7 9 3 6

Besides the fact that our attackers now have the passwd file to crack at their leisure, they can read the users directly from the file Solution: Don t run TFTP, and if you do, wrap it to restrict access, limit access to the /tftpboot directory, and make sure it s blocked at the border firewall