Urgent Fix for Zero-Day Mac Java Flaw

If you run a Mac or know someone who does, please patch your Mac or tell them to patch theirs!

Urgent Fix for Zero-Day Mac Java Flaw — Krebs on Security

Apple on Monday released a critical update to its version of Java for Mac OS X that plugs at least a dozen security holes in the program. More importantly, the patch mends a flaw that attackers have recently pounced on to broadly deploy malicious software, both on Windows and Mac systems.

The update, Java for OS X Lion 2012-001 and Java for Mac OS X 10.6 Update 7, sews up an extremely serious security vulnerability (CVE-2012-0507) that miscreants recently rolled into automated exploit kits designed to deploy malware to Windows users. But in the past few days, information has surfaced to suggest that the same flaw has been used with great success by the Flashback Trojan to infect large numbers of Mac computers with malware.

The revelations come from Russian security firm Dr.Web, which reports that the Flashback Trojan has successfully infected more than 550,000 Macs, most which it said were U.S. based systems (hat tip to Adrian Sanabria).

Flashback is an increasingly sophisticated malware strain that sniffs network traffic in search of user names and passwords. Early versions of it prompted Mac users to enter their password before it would run, but the most recent strains will happily infect vulnerable Mac systems without requiring a password, writes Ars Technica, among others. F-Secure has additional useful information on this Trojan attack here.

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I can’t stress this point strongly enough: If you don’t need Java, remove it from your system, whether you are a Mac or Windows user. If you need further convincing of my reasons for this recommendation, I’d encourage you to browse through some of my past Java-related posts.

Apple maintains its own version of Java, and as with this release, it has typically fallen unacceptably far behind Oracle in patching critical flaws in this heavily-targeted and cross-platform application. In 2009, I examined Apple’s patch delays on Java and found that the company patched Java flaws on average about six months after official releases were made available by then-Java maintainer Sun. The current custodian of Java – Oracle Corp. – first issued an update to plug this flaw and others back on Feb. 17.

The article continues with more details at the Krebs-on-Security site and has an informative world map showing the distribution of infections on Macs.