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The account specified by the /u: switch can be confusing Recall that accounts under NT/2000 are identified by SIDs, which are comprised of MACHINE\account or DOMAIN\account tuples If logging in as just Administrator fails, try using the DOMAIN\account syntax Attackers may try guessing passwords for known local accounts on stand-alone NT Servers or Workstations, rather than the global accounts on NT domain controllers Local accounts more closely reflect the security peccadilloes of individual system administrators and users, rather than the more restrictive password requirements of a central IT organization (such attempts may also be logged on the domain controller) Additionally, NT Workstation allows any user the right to log on interactively (that is, Everyone can Log on locally ), making it easier to remotely execute commands Of course, if you crack the Administrator or a Domain Admin account on the Primary Domain Controller (PDC), you have the entire domain (and any trusting domains) at your mercy Generally, it s worthwhile to identify the PDC, begin automated guessing using low-impact methods (that is, avoiding account lockout, see next), and then simultaneously scan an entire domain for easy marks (that is, systems with NULL Administrator passwords) If you intend to use the following techniques to audit systems in your company (with permission, of course), beware of account lockout when guessing at passwords using manual or automated means There s nothing like a company full of locked-out users to dissuade management from further supporting your security initiatives! To test account lockout, tools like enum ( 3) can dump the remote password policy over null session We also like to verify that the Guest account is disabled and then try guessing passwords against it Yep, even when disabled, the Guest account will indicate when lockout is attained

Table 3-6

5:

Popularity: Simplicity: Impact: Risk Rating: 7 10 1 6

ome feel drugs are about the only thing more addicting than obtaining root access on a UNIX system The pursuit of root access dates back to the early days of UNIX, so we need to provide some historical background on its evolution

The UNIX utility showmount is useful for enumerating NFS-exported file systems on a network For example, say that a previous scan indicated that port 2049 (NFS) is listening on a potential target showmount can then be used to see exactly what directories are being shared:

In 1969, Ken Thompson, and later Dennis Ritchie, of AT&T decided that the MULTICS (Multiplexed Information and Computing System) project wasn t progressing as fast as they would have liked Their decision to hack up a new operating system called UNIX forever changed the landscape of computing UNIX was intended to be a powerful, robust, multiuser operating system that excelled at running programs, specifically, small programs called tools Security was not one of UNIX s primary design characteristics, although UNIX does have a great deal of security if implemented properly UNIX s promiscuity was a result of the open nature of developing and enhancing the operating system kernel, as well as the small tools that made this operating system so powerful The early UNIX environments were usually located inside Bell Labs or in a university setting where security was controlled primarily by physical means Thus, any user who had physical access to a UNIX system was considered authorized In many cases, implementing root-level passwords was considered a hindrance and dismissed While UNIX and UNIX-derived operating systems have evolved considerably over the past 30 years, the passion for UNIX and UNIX security has not subsided Many ardent developers and code hackers scour source code for potential vulnerabilities Furthermore, it is a badge of honor to post newly discovered vulnerabilities to security mailing lists such as Bugtraq In this chapter, we will explore this fervor to determine how and why the coveted root access is obtained Throughout this chapter, remember that in UNIX there are two levels of access: the all-powerful root and everything else There is no substitute for root!

The e switch shows the NFS server s export list For Windows users, Windows Services for Unix (mentioned previously) also supports the showmount command