The Bash bug or the Shellshock bug has recently appeared in the press as the latest threat to computer security (remember the Heartbleed bug!) This is the article from the New York Times.
Apple reports that it’s desktop products are safe from this bug (unless you have changed some very advanced settings which the vast majority of people do not do. These settings are mostly for developers.) Apple Servers are not safe. It is important that your Mac be password protected.
Windows users, for once, are not vulnerable because Windows is not built on Unix.
These types of problems are not going to go away. Protecting your computer and managing your passwords will continue to be required to protect your identity and your data.