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THE WHOLE ENCHILADA: AUTOMATED DISCOVERY TOOLS
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There are many other tools available, and more written every day, that will aid in network discovery While we cannot list every conceivable tool, we wanted to highlight two additional utilities that will augment the tools already discussed Cheops (http://wwwmarkonet/cheops/), pronounced (KEE-ops), depicted in Figure 2-8, is a graphical utility designed to be the all-inclusive network-mapping tool Cheops integrates ping, traceroute, port scanning capabilities, and operating system detection (via queso) into a single package Cheops provides a simple interface that visually depicts systems and related networks, making it easy to understand the terrain Tkined is part of the Scotty package found at http://wwwhomecsutwentenl/ ~schoenw/scotty/ Tkined is a network editor written in Tcl that integrates various network management tools, allowing you to discover IP networks Tkined is quite extensible and enables you to perform network reconnaissance activities graphically depicting the
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Figure 2-8
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Cheops provides many network-mapping utilities in one graphical package
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U Automated Discovery Tools Countermeasures of all the techniques alSince tools like Scotty, tkined, and cheops use a combination
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We have covered the requisite tools and techniques to perform ping sweeps, both TCP and ICMP, port scanning, and operating system detection By using ping sweep tools, you can identify systems that are alive and pinpoint potential targets By using a myriad
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results While it does not perform operating system detection, it will perform many of the tasks mentioned earlier and in 1 In addition to tkined, there are several other discovery scripts provided with Scotty that are worth exploring
ready discussed, the same techniques for detecting those attacks apply to detecting automated tool discoveries
2:
Scanning
of TCP and UDP scanning tools and techniques, you can identify potential services that are listening and make some assumptions about the level of exposure associated with each system Finally, we demonstrated how attackers could use operating system detection software to determine with fine precision the specific operating system used by the target system As we continue, we will see that the information collected thus far is critical to mounting a focused attack
Enu tion era m
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Hacking Exposed: Network Security Secrets and Solutions
ssuming that initial target acquisition and non-intrusive probing haven t turned up any immediate avenues of conquest, an attacker will next turn to identifying valid user accounts or poorly protected resource shares There are many ways to extract valid account or exported resource names from systems, a process we call enumeration This chapter will detail the most prevalent methods The key difference between previously discussed information-gathering techniques and enumeration is in the level of intrusiveness enumeration involves active connections to systems and directed queries As such, they may (should!) be logged or otherwise noticed We will show you what to look for and how to block it, if possible Much of the information garnered through enumeration may appear harmless at first glance However, the information that leaks from the following holes can be your undoing, as we will try to illustrate throughout this chapter In general, once a valid username or share is enumerated, it s usually only a matter of time before the intruder guesses the corresponding password or identifies some weakness associated with the resource sharing protocol By closing these easily fixed loopholes, you eliminate the first foothold of the hacker The type of information enumerated by intruders can be loosely grouped into the following categories:
M I L
Network resources and shares Users and groups Applications and banners
Enumeration techniques are also mostly operating-system specific and thus targeted using information gathered in 2 (port scans and OS detection) By knowing what types of information hackers are after, and how your specific system divulges it, you can take steps to seal these leaks This chapter is divided into three sections based on operating system Windows NT/2000, Novell NetWare, and UNIX We have omitted direct mention of Win 9x because the user and application enumeration techniques referenced here are not relevant to its single-user operational architecture; many of the file share enumeration techniques used for Win NT/2000 work just fine against Win 9x, however Each section describes the preceding techniques in detail, how to detect them, and how to eliminate the vulnerability if possible
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