LastPass Security Notification
We noticed an issue yesterday and wanted to alert you to it. As a precaution, we're also forcing you to change your master password. We take a close look at our logs and try to explain every anomaly we see. Tuesday morning we saw a network traffic anomaly for a few minutes from one of our non-critical machines...In this case, we couldn't find that root cause. After delving into the anomaly we found a similar but smaller matching traffic anomaly from one of our databases in the opposite direction (more traffic was sent from the database compared to what was received on the server). Because we can't account for this anomaly either, we're going to be paranoid and assume the worst: that the data we stored in the database was somehow accessed. We know roughly the amount of data transfered and that it's big enough to have transfered people's email addresses, the server salt and their salted password hashes from the database. We also know that the amount of data taken isn't remotely enough to have pulled many users encrypted data blobs...
LastPass's decision to reset passwords as a precaution has made it difficult for some legitimate users to log onto the service again. Tips on re-enabling accounts can be found in a blog post by Chris Boyd, a security researcher at GFI Software, here.