Sony have released a statement notifying users that another attempt against their network, including PlayStation Network, Sony Online Entertainment and Sony Entertainment Network, has been detected. Sony Chief Information Security Officer Philip Reitinger explained that the perpetrators had attempted to test a "massive set of sign-in IDs and passwords against [their] network database."
It appears that the list IDs and passwords were obtained from other companies and sources. Sony assures users that only 0.1 percent of Sony's networks have been affected. Read the full statement below for details:
We want to let you know that we have detected attempts on Sony Entertainment Network, PlayStation Network and Sony Online Entertainment ("Networks") services to test a massive set of sign-in IDs and passwords against our network database. These attempts appear to include a large amount of data obtained from one or more compromised lists from other companies, sites or other sources. In this case, given that the data tested against our network consisted of sign-in ID-password pairs, and that the overwhelming majority of the pairs resulted in failed matching attempts, it is likely the data came from another source and not from our Networks. We have taken steps to mitigate the activity.
Less than one tenth of one percent (0.1%) of our PSN, SEN and SOE audience may have been affected. There were approximately 93,000 accounts globally (PSN/SEN: approximately 60,000 accounts; SOE: approximately 33,000) where the attempts succeeded in verifying those accounts' valid sign-in IDs and passwords, and we have temporarily locked these accounts. Only a small fraction of these 93,000 accounts showed additional activity prior to being locked. We are currently reviewing those accounts for unauthorized access, and will provide more updates as we have them. Please note, if you have a credit card associated with your account, your credit card number is not at risk. We will work with any users whom we confirm have had unauthorized purchases made to restore amounts in the PSN/SEN or SOE wallet.
As a preventative measure, we are requiring secure password resets for those PSN/SEN accounts that had both a sign-in ID and password match through this attempt. If you are in the small group of PSN/SEN users who may have been affected, you will receive an email from us at the address associated with your account that will prompt you to reset your password.
Similarly, the SOE accounts that were matched have been temporarily turned off. If you are among the small group of affected SOE customers, you will receive an email from us at the address associated with your account that will advise you on next steps in order to validate your account credentials and have your account turned back on.
We want to take this opportunity to remind our consumers about the increasingly common threat of fraudulent activity online, as well as the importance of having a strong password and having a username/password combination that is not associated with other online services or sites. We encourage you to choose unique, hard-to-guess passwords and always look for unusual activity in your account.
Since the huge PSN blackout of 2011 that struck Sony's network earlier this year, it looks like the company is quickly taking action against anymore attempts against their network and customers. Hopefully, users will never have to experience that again.
Source: PlayStation Blog