Google hacking is also referred to as “Google dorking”, It is a information gathering technique used by an attacker leave taking advanced Google searching techniques. Google hacking search queries can be mostly used to identify security vulnerabilities in the web applications, gather information for arbitrary (Random) or individual targets, discover error messages disclosing sensitive information to the users, discover files containing credentials, hidden files and other most sensitive data.

The advanced search string crafted by an attacker could be searching for the vulnerable version of a web application, or a specific file-type (.pwd, .sql…) in order to further narrow the search. The search can also be restricted to pages on a specific site, or it can search for specific information across all websites, giving a list of sites that contain the information.

For instance, the following search query will list SQL files (filetype:sql) available that have been indexed by Google on websites where directory listing is enabled (intitle:”index of”).

intitle:”index of” filetype:sql

Logical symbols and operators in Google Search

Attackers can take leverage of Google search logical operators such as AND, NOT and OR (They are case sensitive) and also operators such as ~, – and *. The following table provides us additional information on these operators.

Logical Operator Description Examples
AND or + Used to include keywords. All the keywords need to be found.
  • web AND application AND security
  • web +application +security
NOT or – Used to exclude keywords. All the keywords need to be found.
  • web application NOT security
  • web application security
OR or | Used to include keywords where either one keyword or another is matched. All the keywords need to be found.
  • web application OR security
  • web application |security
Tilde (~) Used to include synonyms and similar words.
  • web application ~security
Double quote (“) Used to include exact matches.
  • “web application security”
Period (.) Used to include single-character wildcards.
  • .eb application security
Asterisk (*) Used to include single-word wildcards.
  • web * security
Parenthesis (()) Used to group queries
  • (“web security” | websecurity)

Advanced search operators

The advanced Google operators assist the user in refining search results. The syntax of advanced operators is ” operator:search_string_text”

The syntax consists of 3 parts, the operator, the colon (:) and the desired keyword to be hunted. Spaces may be inserted by using double quotes (“).

Google search analyzes the above pattern and restricts the search using the information provided. For instance, using the previously mentioned search query, intitle:”index of” filetype:sql, Google will search for the string index of in the title (this is the default title used by Apache HTTP Server for directory listings) of a website and will restrict the search to SQL files that have been indexed by Google.

The below table lists some of the advanced operators that can be used to find vulnerable websites and information.

Advanced Operator Description Examples
site: Limit the search query to a specific domain or web site.
  • site:example.com
filetype: Limit the search to text found in a specific file type
  • mysqldump filetype:sql
link: Search for pages that link to the requested URL
  • link:www.example.com
cache: Search and display a version of a web page as it was shown when Google crawled it.
  • cache:example.com
intitle: Search for a string text within the title of a page.
  • intitle:”index of”
inurl: Search for a string within a URL
  • inurl:passwords.txt

How to prevent Google Hacking Attacks

Google Hacking is nothing more than a reconnaissance method for attackers to discover potential vulnerabilities and misconfigurations. Therefore, testing websites and web applications for vulnerabilities and misconfigurations and further proceeding to fix them, it not only removes the enumeration risk, but it also prevents exploitation.

Naturally, conventional manual testing of vulnerabilities that can be picked up by a Google search is sore and very much time consuming. On the other hand, this is the sort of task at which a comprehensive automated web vulnerability scanner excels. Identically you should restrict access to these pages by for example, making use of HTTP Authentication.

Thank You for your valuable time. I hope i was informative in this blog about the Google hacking.

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