9 Replies Latest reply: Apr 16, 2012 4:02 PM by eyrehead
eyrehead Level 1 (0 points)

I'm trying to decide if I should install this update, but I don't know if Java is installed on my Mac, or not:


"This Flashback malware removal tool removes the most common variants of the Flashback malware.

If the Flashback malware is found, a dialog will be presented notifying the user that malware was removed.

In some cases, the Flashback malware removal tool may need to restart your computer in order to completely remove the Flashback malware.

This update is recommended for all OS X Lion users without Java installed."

iMac (21.5-inch Mid 2011), Mac OS X (10.7.3)
  • John Galt Level 8 (45,968 points)

    The update will not appear unless you are running Java on your Mac.

  • leroydouglas Level 6 (17,777 points)

    In terminal.app copy and paste:


    sudo /usr/libexec/java_home


    enter your password and return (password will not be echoed.)




    Here is a good overview:


    http://reviews.cnet.com/8301-13727_7-57408841-263/how-to-check-for-and-disable-j ava-in-os-x/

  • thomas_r. Level 7 (30,727 points)

    As stated, this update only shows up in Software Update if you have Java installed.  But if you aren't sure whether you may have installed that already or just want to know if you have Java, try opening the Java Preferences app, found in /Applications/Utilities.  If it complains and asks you to install a Java runtime, you don't have Java.  If it opens up without complaint, you do.

  • R C-R Level 6 (17,400 points)

    Are you sure it only shows up in Software Update if Java is installed? This update "tool" is intended for Lion users that do not have Java installed, so it would be kind of stupid if it only showed up when it wasn't needed.

  • thomas_r. Level 7 (30,727 points)

    When I answered, I don't believe that the "Lion with no Java" update had shown up in Software Update yet.  At this point, though, every machine running 10.6 or 10.7 should see a Flashback-related update in Software Update...  unless it has already been installed.

  • John Galt Level 8 (45,968 points)

    Looks like this happened today, within the last 12 hours in fact:

    Screen Shot 2012-04-14 at 1.20.32 PM.png


    It appears in Software Update as "Flashback malware removal tool" version 1.0.


    I have no Java runtime installed, nor is it enabled in any browsers, and java_home results in this:


    Johns-iMac:SystemConfiguration john$ sudo /usr/libexec/java_home


    Unable to find any JVMs matching version "(null)".

    No Java runtime present, try --request to install.

    Johns-iMac:SystemConfiguration john$


    I was offered no other Java-related software updates until now.


    I can only conclude Apple released this update in an abundance of caution.

  • R C-R Level 6 (17,400 points)

    John Galt wrote:

    I can only conclude Apple released this update in an abundance of caution.

    Perhaps it is intended to protect Lion users that might install an unpatched version of Java in the future, like say from a saved, now out-of-date download?

  • John Galt Level 8 (45,968 points)

    Probably, but I imagine the dirtbags that wrote Flashback are already working on another.


    Version 1.0 of this "malware removal tool" is not likely to be the last

  • eyrehead Level 1 (0 points)

    I do not have any Java runtimes.