Software Update してますか。
By default, your Mac automatically checks for software updates every week, but you can change that setting in Software Update preferences. You can also run Software Update at any time to manually check for the latest updates.
後手に回りますが。

This Java security update removes the most common variants of the Flashback malware. If you do not use Java applets,it is recommended that you disable the Java web plug-in in your web browser.

This update is recommended for all Mac users with Java installed.

For more information on how to disable Java in your web browser see: http://support.apple.com/kb/HT5241

For details about this update see: http://support.apple.com/kb/HT5243

http://support.apple.com/kb/HT5241
http://support.apple.com/kb/HT5242
http://support.apple.com/kb/HT5243
http://support.apple.com/kb/HT5244

なにはともあれ
Apple Menu >> Software Updates...

topic: macosx
first posted: 2012-04-13 12:44:41
last modified: 2012-04-13 13:33:52