Password Manager Service LastPass is forcing users of the password manager service to change master passwords. The move comes in response to the company’s discovery of unusual network activity around one of its databases. LastPass says it detected a “network traffic anomaly” in a noncritical server that led to the discovery of a similar problem with its database that houses email addresses and salted password hashes. The biggest threat is an attacker brute-force hacking master passwords and then using that to get to users’ data.”]