Valve CEO Gabe Newell has just sent a notice to all Steam users warning that last week’s attack on the Steam forums may have also pulled information from their accounts database.
We learned that intruders obtained access to a Steam database in addition to the forums. This database contained information including user names, hashed and salted passwords, game purchases, email addresses, billing addresses and encrypted credit card information. We do not have evidence that encrypted credit card numbers or personally identifying information were taken by the intruders, or that the protection on credit card numbers or passwords was cracked. We are still investigating.
If you use the Steam service, it might be a good time to update your password. You may also want to keep an eye on your credit card statement, just to be sure.