Flashback Mac OS X malware exploiting (old) Java security holes

If a Mac OS X user visits a web page, and their Java is not up to date, the malware infection will occur without their intervention.

A new variant of the Flashback trojan is now exploiting a security hole in Java to silently infect Mac OS X machines, according to a warning from Intego.

While previous versions of Flashback presented users with an installer, Intego is reporting that a new version is now exploiting a pair of old (and already patched) Java vulnerabilities to plant malware on Mac OS X systems.

[ SEE: Ten little things to secure your online presence ]

"If a user visits a web page, and their Java is not up to date, the installation will occur without their intervention," Intego said in an advisory.

"If their Java is up to date, they will only see the certificate alert (image above): they will never be asked for a password, and won’t have to launch any other software to allow the installation to take place," the company added.


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