Before I want to start I want to say that as a language I like Java and all animosity I ever express towards Java is likely really meant for Oracle.
Oracle is officially promoting Java 7 (u4) to users now. It offers no real security benefits in terms of system compromise but it does depreciate a few broken hash methods like md4. There’s some performance improvements as well but it’s Java so, yeah.
And, once again, they’re not removing old versions of Java when they update users to 7. Yep, Java 7 installs to the side of Java 6. That’ll work out well.
Java already makes up the vast majority of exploits used against Windows systems and now users will likely have two versions installed without realizing it. Not only is that two versions of software that’s exploited daily, they probably won’t even realize the first version wasn’t overwritten so they’ll likely not patch it either. The Java Updater is pretty broken, requires you give it UAC (task scheduler wtf) permissions when it runs, and it’s on like… a 1-week schedule or 1-month by default agh it’s actually painful to talk about.
Incidentally Adobe Flash Player 13 for Firefox is going to be sandboxed by default similar to what Chrome does. It’s not a super strong sandbox but unlike Oracle Adobe actually gives a damn about security (I know, I know) and they’re made really big progress with improved ASLR and this new sandbox, which has involved serious cooperation with vendors.
So, Flash, which is the most exploited software after Java, is now going to be significantly more secure on ~20-30% of computers. Attackers could break the relatively weak sandbox given enough time but why the hell bother? You’ve now got two Java versions sitting on systems ready to be exploited.
And, because it’s Java, exploit once – run anywhere! In a study by (I believe) Sophos they actually found quite a few pieces of Windows malware on OSX machines. The OSX users weren’t infected but they’d run into an exploit that had dropped a Windows payload. I’m betting you can guess which program was dropping them.
I’d say EMET + Java = enough but that’s a lie. JIT and EMET don’t go together, it’s irrelevant really for a lot of the exploits. DEP/ASLR/EAF helps only because it’s the JVM that’s so broken and I absolutely still recommend running EMET with your Java (see my guide) but your best bet is to just uninstall it. Seriously, you can’t rely on EMET here – uninstall it.
Linux users just AppArmor Java (see my guide) and you’ll be fine. Updates are handled by the OS so patching isn’t an issue anyways. Feels good.