Apple has released an upgrade for its GarageBand audio editing application that includes a security patch not mentioned in the update announcement.
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According to Apple's support web site, GarageBand 5.1 "addresses general compatibility issues, improves overall stability, and fixes a number of other minor issues".
But a security advisory reveals that the update includes a fix for a security flaw in GarageBand that allows Safari browser users' web activity to be tracked by third parties and advertisers.
The advisory says that when GarageBand is opened, Safari's preferences are changed to always accept cookies. The default preference is to accept cookies only for the sites being visited.
Apple warns that the altered setting may allow third parties and advertisers to track a user's web activity.
GarageBand 5.1 addresses the issue by not changing the preference setting.
"Users who have run previous versions of GarageBand should confirm that their Safari preferences are set as desired," said Apple.