Sudo rm -rf "/Library/PreferencePanes/JavaControlPanel.prefpane" Sudo rm -rf "/Library/Internet Plug-Ins/ugin" My conclusion has changed: You are at risk now. When I wrote about the the Flashback attacks at the end of August, I said, “although you likely aren’t at risk today, it is clear that Java still represents one of the biggest, most persistent security problems facing users of all operating systems.” Since the exploit was unknown, antivirus software wouldn’t necessarily be able to spot and disable it. This is known as a “watering hole” attack, because the bad guys targeted a place that the desired victims visited regularly and voluntarily. The attackers compromised a site known to be used by mobile developers, and then used a previously unknown (or “zero-day”) Java vulnerability to exploit computers through their browsers. This is exactly what happened in the attack against Apple’s employees, and possibly in the attacks against Twitter and Facebook as well.
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Only the sandbox stands between you and any random attacker with a Java program on the Internet and when that sandbox ceases to be impervious, simply browsing a webpage could enable bad guys to take full control of your computer. What makes environments like Java and Flash so problematic is that, when enabled in your browser, they run such programs without asking your permission to do so. The problem arises when a flaw exists in this sandbox (or in other aspects of the JVM), and someone writes malicious code that takes advantage of the flaw to break out and gain additional access to your computer. (Practically speaking, getting something to work across platforms is rarely easy.) The JVM handles memory management and anything else that the application needs, and runs it inside a sandbox that isolates the Java application from your operating system. Theoretically, a developer can write a Java program to run inside the virtual machine, and it will run without modification on any platform-Mac, Windows, Linux, or whatever is running a valid JVM. That means that Java applications are designed to run inside a Java Virtual Machine installed on your Mac. It’s a complete application runtime environment.
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(I also have some advice on isolating Flash.) If you plan to keep Java, make sure that you update it as soon as possible. But I can’t overstate the risk: Nearly all recent Mac malware attacks rely on exploiting Java or Flash in your Web browser. Removing Java will be problematic for some people, especially those who use Macs at work and isolating it isn’t simple.
I don’t make this recommendation lightly.
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