Some users reported that they billed for thousands of U.S. dollars due to fraud. Claims are charged at iTunes account via PayPal.

An Apple spokeswoman said the San Jose Mercury News that his company was aware of the problem.

"Among a number of security fixes on iTunes, users now need to do several times the entry of credit card security code," said the spokesman, as quoted by Apple Insider, August 24, 2010.

However, the spokesman said, if the credit card or iTunes user account passwords stolen and used in iTunes, Apple advises users to contact relevant financial institutions to block credit card. "We also recommend the user to instantly change his iTunes account password,"

Middle of this year, iTunes was attacked by the developer and the fraudsters account. A number of application developers take advantage of a gap that was there to boost their sales ranking. At that time, Apple said, there are 400 accounts that was hijacked from about 150 million active users of iTunes.

This week, Apple also strengthen their Apple ID account security is also used in iTunes. Now users must verify their account information when they log into the new device, and a new iTunes account password must be at least 8 characters that have a combination of capital letters.