The UN site, www.un.org, was hacked on Sunday morning. Hackers took particular 
interest in defacing the Secretary-General Ban Ki-moon page, by replacing text and speeches with the hackers computer names, KEREM125 and GSY, and requesting for Israel and the US to “don’t kill children and other people…peace for ever…no war.”
You may view a sample of the hacked text viewing this Screenshot.
How did the UN site get hacked? By an SQL injection attack. This is an attack that exploits the SQL database used to host the website. These attacks are common with governmental agency websites. You may protect yourself from them by shoring up your security, passwords, and ports of your SQL server. For more info on SQL hacker prevention, you may check out Wikipedia.
The UN site is now up and running fine, but it did take hours before the problem was resolved. You may avoid embarassment and losing such control by locking up your SQL server vulnerabilities.