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Fierce: DNS reconnaissance tool

Fierce

Fierce is a DNS reconnaissance tool for locating non-contiguous IP space.

Useful links:

Overview

First, credit where credit is due, fierce was originally written by RSnake along with others at http://ha.ckers.org/ . This is simply a conversion to Python to simplify and modernize the codebase.

The original description was very apt, so I’ll include it here:

Fierce is a semi-lightweight scanner that helps locate non-contiguous IP space and hostnames against specified domains. It’s really meant as a pre-cursor to nmap, unicornscan, nessus, nikto, etc, since all of those require that you already know what IP space you are looking for. This does not perform exploitation and does not scan the whole internet indiscriminately. It is meant specifically to locate likely targets both inside and outside a corporate network. Because it uses DNS primarily you will often find mis-configured networks that leak internal address space. That’s especially useful in targeted malware.

Installing

$ pip install git+https://github.com/mschwager/fierce 

OR

$ git clone https://github.com/mschwager/fierce.git $ pip install -r requirements.txt 

Using

Let’s start with something basic:

$ fierce --domain google.com --subdomains accounts admin ads 

Traverse IPs near discovered domains to search for contigous blocks with the --traverse flag:

$ fierce --domain facebook.com --subdomains admin --traverse 10 

Limit nearby IP traversal to certain domains with the --search flag:

$ fierce --domain facebook.com --subdomains admin --search fb.com fb.net 

Attempt an HTTP connection on domains discovered with the --connect flag:

$ fierce --domain stackoverflow.com --subdomains mail --connect 

Exchange speed for breadth with the --wide flag, which looks for nearby domains on all IPs of the Class C of a discovered domain:

$ fierce --domain facebook.com --wide 

Zone transfers are rare these days, but they give us the keys to the DNS castle. zonetransfer.me is a very useful service for testing for and learning about zone transfers:

$ fierce --domain zonetransfer.me 

To save the results to a file for later use we can simply redirect output:

$ fierce --domain zonetransfer.me > output.txt 

Internal networks will often have large blocks of contiguous IP space assigned. We can scan those as well:

$ fierce --dns-servers 10.0.0.1 --range 10.0.0.0/24 

Check out --help for further information:

$ fierce --help 

TODO

  • Provide multiprocessing capabilities

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