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Password guessing is the most surgical when it leverages age-old user password selection errors These are outlined as follows: M Users tend to choose the easiest password possible that is, no password By far, the biggest hole on any network is the null or trivially guessed password, and that should be a priority when checking your systems for security problems They will choose something that is easy to remember, like their username or their first name, or some fairly obvious term like user_name, company_name, guest, test, admin, or password Comment fields (visible in DumpACL/ DumpSec enumeration output, for example) associated with user accounts are also famous places for hints at password composition A lot of popular software runs under the context of an NT user account These account names generally become public knowledge over time, and even worse, are generally set to something memorable Identifying known accounts like this during the enumeration phase can provide intruders with a serious leg up when it comes to password guessing

.

Some examples of these common user/password pairs which we call high probability combinations are shown in Table 5-1 Also, you can find a huge list of default passwords at http://wwwsecurityparadigmcom/defaultpwhtm

exists However, using the basic concepts outlined here, you should at least have a start on sealing the lips of the loose-talking software on your network, including: Fundamental OS architectures The Windows NT Family s SMB underpinnings make it extremely easy to elicit user credentials, le system exports, and application info Lock down NT and its progeny by disabling or restricting access to TCP 139 and 445 and setting RestrictAnonymous (or the related Network Access settings in Windows XP/Server 2003) as suggested earlier in this chapter Also, remember that newer Windows OSes haven t totally vanquished these problems, either, and they come with a few new attack points in Active Directory, such as LDAP and DNS Novell NetWare will divulge similar information that requires due diligence to keep private SNMP Designed to yield as much information as possible to enterprise management suites, improperly con gured SNMP agents that use default community strings such as public can give out this data to unauthorized users Leaky OS services Finger and rpcbind are good examples of programs that give away too much information Additionally, most built-in OS services eagerly present banners containing the version number and vendor at the slightest tickle Disable programs such as nger, use secure implementations of RPC or TCP Wrappers, and nd out from vendors how to turn off those darn banners! Custom applications Although we haven t discussed it much in this chapter, the rise of built-from-scratch web applications has resulted in a concomitant rise in the information given out by poorly conceived customized app code Test your own apps, audit their design and implementation, and keep up to date with the newest web app hacks in Hacking Exposed Web Applications, Second Edition (McGraw-Hill Professional, 2006; wwwwebhackingexposedcom) Firewalls Many of the sources of these leaks can be screened at the rewall This isn t an excuse for not patching the holes directly on the machine in question, but it goes a long way toward reducing the risk of exploitation Finally, be sure to audit yourself Wondering what ports are open for enumeration on your machines There are plenty of Internet sites that will scan your systems remotely One free one we like to use is located at https://wwwgrccom/x/nedll bh0bkyd2, which will run a simple nmap scan of a single system or a Class C sized network (the system requesting the scan must be within this range) For a list of ports and what they are, see wwwianaorg/assignments/port-numbers.

Password NULL, password, administrator arcserve, backup test, password lab, password username, company_name backup tivoli symbiator, as400 backup

.

Table 5-1