SQL Injection Attack: What is it, and how to prevent it. The way that Yahoo! was hacked, SQL Injection attack, is the same method as many other hacks in the news recently: SQL Injection.

Tools are available that allow attackers to quickly check home-grown and third-party Web applications for SQL injection vulnerabilities, Wysopal said.

SQL Injection SQL injection (SQLi) is a technique that allows an attacker to execute SQL statements in an entry field. This technique was used with great success by the Lulzsec hackers.