Story : http://arstechnica.com/security/2013/04/java-users-beware-exploit-circulating-fo
If you haven't installed last week's patch from Oracle that plugs dozens of critical holes in its Java software framework, now would be a good time. As in immediately. As in, really, right now.
In the past few days, attack code targeting one of the many remote-code-execution vulnerabilities fixed in Java 7 Update 21 was folded into either the folded into the RedKit or CrimeBoss exploit kit. By Sunday, that attack code was being actively unleashed on unsuspecting end users, according to a short blog post published by a researcher from antivirus provider F-Secure.
The post doesn't say where the attacks were being hosted or precisely how attackers are using them. Still, Oracle describes the vulnerability as allowing remote code execution without authentication. And that means you should install the patch before you do anything else today. The track record of malware purveyors of abusing advertising networks, compromised Apache servers, and other legitimate enterprises means readers could encounter attacks even when they're browsing a site they know and trust.