All of this means that DBA's and site security managers need to take database security seriously and also learn the techniques of google hacking and apply them against their own Oracle databases so that they do not fall prey to one of the newest database (and in general) hacking techniques.
Aaron’s paper is excellent and covers the subject very well. Aaron starts off by talking about database security in general and the sad fact that a lot of companies do not protect the data at source but instead use perimeter security techniques such as firewalls. he then talks about search engine hacking and moves on to talk in detail about how to find Oracle databases exposed to the Internet. Aaron goes through some examples of how to use google to search for the web based version of SQL*Plus, iSQL*Plus showing some sample results from a google search and also a Yahoo! search.
He then details how iSQL*Plus can be used to hack a 184.108.40.206 database patched for alert #68 by using a common default username and password DBSNMP/DBSNMP. Aaron gives a link to the CIRT Oracle default password list but I should point out that the Oracle default password list is much larger than the CIRT list and my list contains 600 default usernames and passwords. I also have an Oracle default password check script on my site. Aaron then goes on to show how a list of usernames and password hashes can be obtained for offline cracking.
Aaron then goes on to talk about looking for web pages that are vulnerable to SQL Injection attempts (I have written a three part paper on SQL Injection in Oracle a while ago). Aaron shows some results and then goes on to show an actual attack. He then talks about SQL Buffer overflows and JDBC as well as error strings. The paper moves on to talk about directory listings being revealed and closes with thoughts on how to militate against the issue.
This is a superb paper introducing the subject of google hacking and search engine hacking in general to the Oracle community and in particular to those interested in securing their data. All DBA's owe it to themselves to read this paper and learn about how simply exposing files to the Internet can have disastrous results. The paper "Search Engines Used to Attack Databases is here".