Difference between revisions of "Testing: Conduct search engine discovery/reconnaissance for information leakage (OTG-INFO-001)"

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{{Template:OWASP Testing Guide v3}}
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{{Template:OWASP Testing Guide v4}}
  
'''This is a draft of a section of the new Testing Guide v3'''
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== Summary ==
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There are direct and indirect elements to Search engine discovery and reconnaissance. Direct methods relate to searching the Google Index and remove the associated web content from the Google Cache. Indirect methods relate to gleaning sensitive design and configuration information by searching forums, newsgroups and tendering websites.
  
== Brief Summary ==
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Once the GoogleBot has completed crawling, it commences indexing the web page based on tags and associated attributes, such as <TITLE>, in order to return the relevant search results. [1]
<br>
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This section describes how to search the Google Index and remove the associated web content from the Google Cache.
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<br>
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== Description of the Issue ==
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If the robots.txt file is not updated during the lifetime of the web site, then it is possible for web content not intended to be included in Google's Search Results to be returned.
<br>
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When web content is indexed by Google their Crawler referred to as "Googlebot" refers to the robots.txt file in the web root directory.
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If the robots.txt file is not revised during changes to web content, then it is possible for web content not intended to be included in Google's Search Results to be indexed by Google.
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Therefore, it must be removed from the Google Cache.
  
Therefore, this web content must be removed from the Google Cache.
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== Test Objectives ==
<br>
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== Black Box Testing==
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To understand what sensitive design and configuration information is exposed of the application/system/organisation both directly (on the organisation's website) or indirectly (on a third party website)
The Advanced "site:" Search Operator of Google restricts its Search Results to a specific domain.
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Google provides the Advanced "cache:" Search Operator but this is the equivalent of clicking the "Cached" link of individual Google Search Results.  Hence, the use of the Advanced "site:" Search Operator is advocated.
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== How to Test ==
  
== Example ==
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Using a search engine, search for:
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* Network diagrams and configurations
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* Archived posts and emails by administrators and other key staff
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* Logon procedures and username formats
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* Usernames and passwords
  
To find the web content of http://www.owasp.org indexed by Google Cache the following Google Search Query is issued:
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=== Black Box Testing ===
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Using the advanced "site:" search operator, it is possible to restrict Search Results to a specific domain [2].
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Google provides the Advanced "cache:" search operator [2], but this is the equivalent to clicking the "Cached" next to each Google Search Result.  Hence, the use of the Advanced "site:" Search Operator and then clicking "Cached" is preferred.
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The Google SOAP Search API supports the doGetCachedPage and the associated doGetCachedPageResponse SOAP Messages [3] to assist with retrieving cached pages. An implementation of this is under development by the [[::Category:OWASP_Google_Hacking_Project |OWASP "Google Hacking" Project]].
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==== Example ====
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To find the web content of owasp.org indexed by Google Cache the following Google Search Query is issued:
 
<pre>
 
<pre>
 
site:owasp.org
 
site:owasp.org
 
</pre>
 
</pre>
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[[Image:Google_site_Operator_Search_Results_Example_20121219.jpg]]
  
== Remediation ==
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To display the index.html of owasp.org as cached by Google the following Google Search Query is issued:
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<pre>
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cache:owasp.org
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</pre>
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[[Image:Google_cache_Operator_Search_Results_Example_20121219.jpg]]
  
If the removal is not urgent then simply modifying the robots.txt file to "Disallow:" this content will result in its removal from the index once Googlebot has completed crawling the web site.
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=== Gray Box testing and example ===
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Grey Box testing is the same as Black Box testing above.
  
For urgent removal, Google provide the "URL Removal" function as part of their "Google Webmaster Tools" service.
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== Tools ==
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[1] FoundStone SiteDigger - http://www.mcafee.com/uk/downloads/free-tools/sitedigger.aspx <br>
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[2] Google Hacker - http://yehg.net/lab/pr0js/files.php/googlehacker.zip<br>
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[3] Stach & Liu's Google Hacking Diggity Project - http://www.stachliu.com/resources/tools/google-hacking-diggity-project/ <br>
  
== Gray Box testing and example ==  
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== Vulnerability References ==
Grey Box testing is the same as Black Box testing above
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'''Web'''<br>
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[1] "Google Basics: Learn how Google Discovers, Crawls, and Serves Web Pages" - http://www.google.com/support/webmasters/bin/answer.py?answer=70897 <br>
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[2] "Operators and More Search Help" - http://support.google.com/websearch/bin/answer.py?hl=en&answer=136861 <br>
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== Remediation ==
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Carefully consider the sensitivity of design and configuration information before it is posted online.
  
== References ==
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Periodically review the sensitivity of existing design and configuration information that is posted online.
[1] "Advanced Google Search Operators" - http://www.google.com/help/operators.html <br>
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[2] "Preventing content from appearing in Google search results" - http://www.google.com/support/webmasters/bin/topic.py?topic=8459
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Revision as of 07:18, 21 July 2013

This article is part of the new OWASP Testing Guide v4. 
At the moment the project is in the REVIEW phase.

Back to the OWASP Testing Guide v4 ToC: https://www.owasp.org/index.php/OWASP_Testing_Guide_v4_Table_of_Contents Back to the OWASP Testing Guide Project: http://www.owasp.org/index.php/OWASP_Testing_Project

Contents


Summary

There are direct and indirect elements to Search engine discovery and reconnaissance. Direct methods relate to searching the Google Index and remove the associated web content from the Google Cache. Indirect methods relate to gleaning sensitive design and configuration information by searching forums, newsgroups and tendering websites.

Once the GoogleBot has completed crawling, it commences indexing the web page based on tags and associated attributes, such as <TITLE>, in order to return the relevant search results. [1]

If the robots.txt file is not updated during the lifetime of the web site, then it is possible for web content not intended to be included in Google's Search Results to be returned.

Therefore, it must be removed from the Google Cache.

Test Objectives

To understand what sensitive design and configuration information is exposed of the application/system/organisation both directly (on the organisation's website) or indirectly (on a third party website)

How to Test

Using a search engine, search for:

  • Network diagrams and configurations
  • Archived posts and emails by administrators and other key staff
  • Logon procedures and username formats
  • Usernames and passwords

Black Box Testing

Using the advanced "site:" search operator, it is possible to restrict Search Results to a specific domain [2].

Google provides the Advanced "cache:" search operator [2], but this is the equivalent to clicking the "Cached" next to each Google Search Result. Hence, the use of the Advanced "site:" Search Operator and then clicking "Cached" is preferred.

The Google SOAP Search API supports the doGetCachedPage and the associated doGetCachedPageResponse SOAP Messages [3] to assist with retrieving cached pages. An implementation of this is under development by the OWASP "Google Hacking" Project.

Example

To find the web content of owasp.org indexed by Google Cache the following Google Search Query is issued:

site:owasp.org

Google site Operator Search Results Example 20121219.jpg

To display the index.html of owasp.org as cached by Google the following Google Search Query is issued:

cache:owasp.org

Google cache Operator Search Results Example 20121219.jpg

Gray Box testing and example

Grey Box testing is the same as Black Box testing above.

Tools

[1] FoundStone SiteDigger - http://www.mcafee.com/uk/downloads/free-tools/sitedigger.aspx
[2] Google Hacker - http://yehg.net/lab/pr0js/files.php/googlehacker.zip
[3] Stach & Liu's Google Hacking Diggity Project - http://www.stachliu.com/resources/tools/google-hacking-diggity-project/

Vulnerability References

Web
[1] "Google Basics: Learn how Google Discovers, Crawls, and Serves Web Pages" - http://www.google.com/support/webmasters/bin/answer.py?answer=70897
[2] "Operators and More Search Help" - http://support.google.com/websearch/bin/answer.py?hl=en&answer=136861

Remediation

Carefully consider the sensitivity of design and configuration information before it is posted online.

Periodically review the sensitivity of existing design and configuration information that is posted online.