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The most fundamental of enumeration techniques is banner grabbing, which was mentioned briefly in 2 Banner grabbing can be simply defined as connecting to remote applications and observing the output, and it can be surprisingly informative to remote attackers At the very least, they may have identified the make and model of the running service, which in many cases is enough to set the vulnerability research process in motion As also noted in 2, many port-scanning tools can perform banner grabbing in parallel with their main function of identifying open ports (the harbinger of an exploitable remote service) This section will briefly catalog the most common manual techniques for banner grabbing, of which no self-respecting hacker should be ignorant (no matter how automated port scanners become)

Enumeration Countermeasures U NetBIOSof the preceding techniques operate over the NetBIOS transports discussed so Nearly all

Popularity: Simplicity: Impact: Risk Rating: 5 9 1 5

frequently by this point, so by denying access to TCP and UDP 135 through 139, none of these activities will be successful The best way to do this is by blocking access to these ports using a router, firewall, or other network gatekeeper For stand-alone hosts, we discussed how to disable NetBIOS over TCP/IP in the previous section on null sessions, where we also described configuring the RestrictAnonymous Registry key This will prevent sensitive information from being downloaded over an anonymous connection RestrictAnonymous will not block net view and nbtstat queries, however Also, remember that Win 2000 provides some of this information via TCP/UDP 445, so it should be blocked as well

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

The tried-and-true manual mechanism for enumerating banners and application info has traditionally been based on telnet (a remote communications tool built into most operating systems) Using telnet to grab banners is as easy as opening a telnet connection to a known port on the target server, pressing enter a few times, if necessary, and seeing what comes back:

Even if you have tightly secured access to NetBIOS services, your NT/2000 systems may still cough up similar information if they are running the Simple Network Management Protocol (SNMP) agent accessible via default community strings like public Enumerating NT users via SNMP is a cakewalk using the NTRK snmputil SNMP browser:

C:\>telnet wwwexamplecom 80 HTTP/11 400 Bad Request Server: Microsoft-IIS/50 Date: Tue, 15 Jul 2008 21:33:04 GMT Content-Type: text/html Content-Length: 87 <html><head><title>Error</title> </head><body>The parameter is incorrect </body> </html>

C:\>snmputil walk 19216820233 public 136141771225 Variable = isoorgdodinternetprivateenterpriseslanmanager lanmgr-2serversvUserTablesvUserEntrysvUserName5 71117101115116 Value = OCTET STRING - Guest Variable = isoorgdodinternetprivateenterpriseslanmanager lanmgr-2server svUserTablesvUserEntrysvUserName13 6510010910511010511511611497116111114 Value = OCTET STRING - Administrator End of MIB subtree

This is a generic technique that works with many common applications that respond on a standard port, such as HTTP port 80, SMTP port 25, or FTP port 21 For a slightly more surgical probing tool, rely on netcat, the TCP/IP Swiss Army knife Netcat was written by Hobbit and ported to the Windows NT Family by Weld Pond while he was with the L0pht security research group As you will see throughout this book, netcat belongs in the permanent System Administrators Hall of Fame for its

The last variable in the preceding snmputil syntax 136141771225 is the object identifier (OID) that specifies a specific branch of the Microsoft enterprise Management Information Base (MIB), as defined in the SNMP protocol The MIB is a hierarchical namespace, so walking up the tree (that is, using a less-specific number like 13614177) will dump larger and larger amounts of info Remembering all those numbers is clunky, so

elegant flexibility When employed by the enemy, it is simply devastating Here, we will examine one of its more simplistic uses, connecting to a remote TCP/IP port and enumerating the service banner:

an intruder will use the text string equivalent The following table lists some segments of the MIB that yield the juicy stuff: SNMP MIB (append this to isoorgdodinternetprivateenterpriseslanmanagerlanmgr2) serversvSvcTablesvSvcEntrysvSvcName serversvShareTablesvShareEntrysvShareName serversvShareTablesvShareEntrysvSharePath serversvShareTablesvShareEntrysvShareComment serversvUserTablesvUserEntrysvUserName domaindomPrimaryDomain

A bit of input here usually generates some sort of a response In this case, pressing enter causes the following:

Enumerated Information Running services Share names Share paths Comments on shares Usernames Domain name

HTTP/11 400 Bad Request Server: Microsoft-IIS/50 Date: Tue, 15 Jul 2008 00:55:22 GMT Content-Type: text/html Content-Length: 87 <html><head><title>Error</title> </head><body>The parameter is incorrect </body> </html>

Of course, to avoid all this typing, you could just download the excellent graphical SNMP browser called IP Network Browser from http://wwwsolarwindsnet and see all this information displayed in living color Figure 3-3 shows IP Network Browser examining a network for SNMP-aware systems

Enumeration Countermeasures U NT/2000 SNMPto prevent such activity is to remove the SNMP agent or to turn off the The simplest way