A new piece of Mac OS X-focused malware has been identified by F-Secure researchers, while a federal US computer security watchdog warns on another recently disclosed bug in the system.

Public broadcaster the BBC today published a flawed report on the federal warning of a security bug.

The report warns of the DMG bug that was revealed by Secunia last week.

The BBC report reveals all the risks of the bug, but fails to let Mac users know just how easily they can protect themselves against it.

The BBC report does say that no cases of this bug being used by hackers have been revealed in the wild, but doesn't say that prevention against the bug's effects is as simple as disabling the opening of safe files after downloading, a setting that can be adjusted in Safari Preferences.

Instead the BBC writes: "Apple has yet to provide a fix for the DMG bug though a workaround is known which should stop computers falling victim."

Mac users are annoyed at the BBC's omission of the exact workaround.

Meanwhile, F-Secure warns that it has recently received a proof-of-concept sample of an adware application that can affect Mac OS X. The adware will launch the Mac's browser when any other application is launched.

"In theory, this application could be silently installed to your User account and hooked to each application you use, and doesn't require Administrator rights to do so," the security analysts warn on their blog.

They observe that Apple should take steps to prevent applications installing a System Library without prompting the user.