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As you can see here, a number of DNS entries have come back that indicate multiple MX, NS, and A records present in the name server MX records are the DNS entries that map the domain name to a particular mail server NS records are the name servers that are authoritative for that domain (examplecom) And A records are Address records that map a DNS name (such as mx1examplecom) to a particular IP address (such as 17232457) What this tells us is that various DNS names and IP addresses are associated with this domain (examplecom) and they can be targeted for attack If the hacker goes after the mail server, he can affect mail traffic If the hacker goes after the name server, he can affect name resolution services And in so targeting these systems, the hacker can affect the availability of vital functions within a company To do this, the attacker could alter the DNS records in the name server and effectively re-route traffic from one IP address to an IP address under his control, thereby redirecting queries for popular websites (such as Microsoft s Windowsupdatemicrosoftcom or CNNcom) to his own malicious servers instead

.

As we noted in 1, the best countermeasures for DNS inquiries like those performed by dig include securing your DNS infrastructure, such as blocking or restricting zone transfers Beyond these simple steps, there is little else to do to prevent this information from disclosure, as the designed intent of DNS is to provide it broadly in response to network queries If you don t want information about a specific host propagated in this way, it probably shouldn t be in your DNS

systems were identified is to include Appendix A: All Responses From Target Modems in the final report, and to examine the list manually Besides the standard carrier detection, PhoneSweep will launch a dictionary attack against identified modems The bruteforcetxt file in the application directory is a simple tab-delimited file of usernames and passwords that is fed to answering modems If the system hangs up, PhoneSweep redials and continues through the list until it reaches the end (beware of account lockout features on the target system if using this to test security on your remote access servers) This feature alone is worth the price of admission for PhoneSweep because it automates a great deal of poking and prodding that would otherwise have to be done manually or with other software (see Carrier Exploitation Techniques next) PhoneSweep s built-in SQL database for logging call results across all available modems is another useful feature This eliminates manual hunting through text files, or merging and importing data from multiple formats into spreadsheets and the like, as is common with freeware tools There is only one report template available, but it is a thing of beauty, containing introductory information that is actually useful, executive and technical summaries of activities and results, statistics in tabular format, raw terminal responses from identified modems (optionally specified as Appendix A), and an entire listing of the phone number taxonomy (also optional, specified as Appendix B), all generated as a single Microsoft Rich Text Format file A portion of a sample PhoneSweep report is shown in Figure 9-6 Of course, the biggest difference between PhoneSweep and freeware tools is cost As of this writing, two versions of PhoneSweep are available: PhoneSweep Basic, which supports up to one modem and 800 numbers per profile, for US $980 (one additional year of support for Basic costs US $196); and PhoneSweep Plus, supporting up to four modems and 10,000 numbers per profile for US $2,800 (an additional year of support for Plus.

Popularity: Simplicity: Impact: Risk Rating: 10 10 3 8

9:

Figure 9-6

Using the traceroute or tracertexe utility included in UNIX or Microsoft Windows, respectively, you can view routers between yourself and a destination host This provides a good start for targeting a large part of the networking infrastructure routers and is

This small portion of a sample PhoneSweep report shows the simultaneous level of summarization and detail in the single built-in report template

7:

costs US $560) These licensing restrictions are enforced with a hardware dongle that attaches to the parallel port the software will not install if the dongle is not present Depending on the cost of hourly labor to set up, configure, and manage the output of freeware tools, $2,800 can seem like a reasonable amount Some interesting thoughts on PhoneSweep versus THC-Scan from an admittedly biased source, Simson L Garfinkel of Sandstorm Enterprises, Inc, can be found at http://geek-girlcom/bugtraq/1998_4/0770html It s a good read for those on the fence; so are the responses Whatever tools you choose, it s important to understand what you re looking for in the output We ll discuss that next