What's Parsero?

Parsero is a free script written in Python which reads the Robots.txt file of a web server and looks at the Disallow entries. The Disallow entries tell the search engines what directories or files hosted on a web server mustn't be indexed. For example, "Disallow: /portal/login" means that the content on www.example.com/portal/login it's not allowed to be indexed by crawlers like Google, Bing, Yahoo... This is the way the administrator have to not share sensitive or private information with the search engines.

But sometimes these paths typed in the Disallows entries are directly accessible by the users without using a search engine, just visiting the URL and the Path, and sometimes they are not available to be visited by anybody. Because it is really common that the administrators write a lot of Disallows and some of them are available and some of them are not, you can use Parsero in order to check the HTTP status code of each Disallow entry in order to check automatically if these directories are available or not.

Also, the fact the administrator write a robots.txt, it doesn't mean that the files or directories typed in the Dissallow entries will not be indexed by Bing, Google, Yahoo, etc. For this reason, Parsero is capable of searching in Bing to locate content indexed without the web administrator authorization. Parsero will check the HTTP status code in the same way for each Bing result.

When you execute Parsero, you can see the HTTP status codes. For example, the codes bellow:

200 OK          The request has succeeded.
403 Forbidden   The server understood the request, but is refusing to fulfill it.
404 Not Found   The server hasn't found anything matching the Request-URI.
302 Found       The requested resource resides temporarily under a different URI.
...

You can get all the latest info about Parsero from http://www.behindthefirewalls.com/search/?q=parsero

Installing

There are three ways to install Parsero easily.

By using setup.py script

sudo setup.py install

By using pip3

sudo apt-get install python3-pip
sudo pip3 install parsero

In Kali Linux

sudo apt-get update
sudo apt-get install parsero

Usage

$ parsero -h
    
usage: parsero.py [-h] [-u URL] [-o] [-sb]

optional arguments:
-h, --help  show this help message and exit
-u URL      Type the URL which will be analyzed
-o          Show only the "HTTP 200" status code
-sb         Search in Bing indexed Disallows
-f FILE     Scan a list of domains from a list

Example

root@kali:~# parsero -u www.example.com -sb

     ____                               
    |  _ \ __ _ _ __ ___  ___ _ __ ___  
    | |_) / _` | '__/ __|/ _ \ '__/ _ \ 
    |  __/ (_| | |  \__ \  __/ | | (_) |
    |_|   \__,_|_|  |___/\___|_|  \___/ 

Starting Parsero v0.75 (https://github.com/behindthefirewalls/Parsero) at 05/22/14 11:12:55
Parsero scan report for example.com
http://example.com/download.php 302 Moved Temporarily
http://example.com/raw.php 302 Moved Temporarily
http://example.com/embed_js.php 200 OK
http://example.com/embed.php 200 OK
http://example.com/print.php 302 Moved Temporarily
http://example.com/diff.php 302 Moved Temporarily
http://example.com/share.php 404 Not Found
http://example.com/report.php 302 Moved Temporarily
http://example.com/embed_iframe.php 200 OK
                                         
[+] 9 links have been analyzed and 3 of them are available!!!
                                         
Searching the Disallows entries in Bing
                                         
http://www.bing.com/search?q=site:http://example.com/download.php
http://www.bing.com/search?q=site:http://example.com/raw.php
- example.com/raw.php/contact?i=KR9c2erd 200 OK
- example.com/raw.php/legal.aspx 302 Moved Temporarily
- example.com/raw.php/points?i=KR9c2erd 200 OK
- example.com/raw.php/image/sqrn11sp3C/zayn-tshirt-one-direction?i=... 302 Moved Temporarily
http://www.bing.com/search?q=site:http://example.com/embed_js.php
http://www.bing.com/search?q=site:http://example.com/embed.php
http://www.bing.com/search?q=site:http://example.com/print.php
http://www.bing.com/search?q=site:http://example.com/diff.php
http://www.bing.com/search?q=site:http://example.com/share.php
http://www.bing.com/search?q=site:http://example.com/report.php
http://www.bing.com/search?q=site:http://example.com/embed_iframe.php
                                         
Finished in 7.290362596511841 seconds

Disclaimer

The use of this tool is your responsability. Use parsero to audit your own servers or servers you are allowed to scan. I hereby disclaim any responsibility for actions taken with this tool.

Author

Javier Nieto <javier.nieto at behindthefirewalls.com>
Twitter: @behindfirewalls
Web: http://www.behindthefirewalls.com

Credits

I'd like thank to @cor3dump3d from http://www.devconsole.info for his support and help.

behindthefirewalls / Parsero