“Shortly after reports of the first virus for Mac OS X, a new security flaw has surfaced. The culprit is the option “Open ‘safe’ files after downloading” in Apple’s Safari web browser. This feature is activated by default. Its function is to automatically display images and movies after they are transmitted to the user’s computer, using the application assigned to that particular document format. Safari will also unpack ZIP archives and display the documents within if they are considered “safe”. If active content such as an application or shell script is found within the archive, a prompt requests user confirmation. So far, so good.” Full story on heise.de Luckily I use a different browser for mac
UPDATE: I’m not so lucky. This affects apple mail as well. Oh boy.