Yet another 0 day exploit in Java. If you have not disabled Java in your browser, do so now. It's pretty straight forward to do in Safari, and pretty painful in Chrome. Best thing to do is to Google for instructions.
Go to Java.com to see if Java is running.
Last month the US Department of Homeland Security advised users to uninstall Java after another 0 day exploit.
Oracle has run Java into the ground, their security updates even try to trick you into installing the Ask toolbar.
If you don't need it, uninstall it. Almost no one need to have Java running in the browser, so everyone should disable it there. It is Java in the browser that poses the greatest risk, as you can get infected by visiting a website. If Apple and Facebook developers can get infected what chance do the rest of us stand?