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We won t go through each record in detail, but we will point out several important types We see that for each entry we have an A record that denotes the IP address of the system name located to the right In addition, each host has an HINFO record that identifies the platform or type of operating system running (see RFC 952) HINFO records are
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not needed, but provide a wealth of information to attackers Since we saved the results of the zone transfer to an output file, we can easily manipulate the results with UNIX programs like grep, sed, awk, or perl Suppose we are experts in SunOS or Solaris We could programmatically find out the IP addresses that had an HINFO record associated with SPARC, Sun, or Solaris
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[bash]$ grep -i solaris zone_out |wc l 388
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We can see that we have 388 potential records that reference the word Solaris Obviously, we have plenty of targets Suppose we wanted to find test systems, which happen to be a favorite choice for attackers Why Simple they normally don t have many security features enabled, often have easily guessed passwords, and administrators tend not to notice or care who logs in to them They re a perfect home for any interloper Thus, we can search for test systems as follows:
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[bash]$ grep -i test /tmp/zone_out |wc l 96
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So we have approximately 96 entries in the zone file that contain the word test This should equate to a fair number of actual test systems These are just a few simple examples Most intruders will slice and dice this data to zero-in on specific system types with known vulnerabilities Keep a few points in mind The aforementioned method only queries one nameserver at a time This means that you would have to perform the same tasks for all nameservers that are authoritative for the target domain In addition, we only queried the Acmenet domain If there were subdomains, we would have to perform the same type of query for each subdomain (for example, greenhouseAcmenet) Finally, you may receive a message stating that you can t list the domain or that the query was refused This usually indicates that the server has been configured to disallow zone transfers from unauthorized users Thus, you will not be able to perform a zone transfer from this server However, if there are multiple DNS servers, you may be able to find one that will allow zone transfers Now that we have shown you the manual method, there are plenty of tools that speed the process, including, host, Sam Spade, axfr, and dig The host command comes with many flavors of UNIX Some simple ways of using host are as follows:
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host -l Acmenet
host -l -v -t any Acmenet
If you need just the IP addresses to feed into a shell script, you can just cut out the IP addresses from the host command:
host -l acmenet |cut -f 4 -d" " >> /tmp/ip_out
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Not all footprinting functions must be performed through UNIX commands A number of Windows products provide the same information, as shown in Figure 1-5 Finally, you can use one of the best tools for performing zone transfers, axfr (http:// ftpcditeducn/pub/linux/wwwtrinuxorg/src/netmap/axfr-052targz) by Gaius This
Figure 1-5
If you re Windows inclined, you could use the multifaceted Sam Spade to perform a zone transfer as well as other footprinting tasks
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utility will recursively transfer zone information and create a compressed database of zone and host files for each domain queried In addition, you can even pass top-level domains like com and edu to get all the domains associated with com and edu, respectively However, this is not recommended To run axfr, you would type the following:
[bash]$ axfr Acmenet axfr: Using default directory: /root/axfrdb Found 2 name servers for domain 'Acmenet': Text deleted Received XXX answers (XXX records)
To query the axfr database for the information you just obtained, you would type the following:
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