Some security analysts are claiming that Apple only partially fixed a flaw in Mac OS X that allows applications to run automatically after they are downloaded by Safari, Mail, or iChat. According to ZDNet UK, Apple added a new fail safe called "download validation" to the applications to warn users that downloaded files may be malicious, but does not prevent users from launching applications that are masquerading as something else.
The issue that still remains is commonly referred to as a "trojan horse," or an application that is disguised to seem like a safe file or program, but actually hides a malicious application.
In this case, the problem is that Mac OS X looks to file name extensions for the proper icon to display, but it looks at the fileis metadata to determine what to do if the file is opened. This allows someone to create an application that at first glance appears to be something innocent, like a JPEG image, but in reality is a script that executes commands without your knowledge. When the file is downloaded, it remains inactive, but when a user double-clicks it, the hidden application launches.
Although this is an issue, itis not as big a deal as some media outlets are implying. Cybertrust analyst, Kevin Long, commented "Itis true that this security update does not translate into Macs that are invulnerable. However, Apple has put some things in place to assist users in detecting questionable files... thereis no need to freak out about this."
Apple is aware of the problem with file extensions and metadata, and is actively taking feedback from users, and is looking into the possibility of adding protection for trojan horse-type files at a deeper level in the operating system.
Phil Schiller, Appleis senior vice president of world wide marketing, stated "We always try to make this better and stronger."