What is Google hacking?
Google hacking is the term used when a hacker tries to find exploitable targets and sensitive data by using search engines. The Google Hacking Database (GHDB) is a database of queries that identify sensitive data. Although Google blocks some of the better known Google hacking queries, nothing stops a hacker from crawling your site and launching the Google Hacking Database queries directly onto the crawled content.
The Google Hacking Database is located at http://johnny.ihackstuff.com. More information about Google hacking can be found on: http://www.informit.com/articles/article.asp?p=170880&rl=1.
What a hacker can do if your site is vulnerable
Information that the Google Hacking Database identifies:
How to check for Google hacking vulnerabilities
The easiest way to check whether your web site & applications have Google hacking vulnerabilities, is to use a Web Vulnerability Scanner. A Web Vulnerability Scanner scans your entire website and automatically checks for pages that are identified by Google hacking queries. (Note: Your web vulnerability scanner must be able to launch Google hacking queries).
Preventing Google hacking attacks