Quick: Time to Patch

A security hole has been discovered in QuickTime. This affects versions running on both Macs and PCs.

Mac users: Get the patch by running Software Update.

PC users: If you recently installed or upgraded iTunes/QuickTime on your PC, you probably also have a program installed called "Apple Software Update." (Do Start -> Programs or Start -> All Programs to see if you have it.) If you do, run that program.

If you don't have "Apple Software Update" installed, you may want to look into this -- it's being portrayed as a serious bug.

Further reading:

• Apple's page
• SANS advisory page
• Google News results for "quicktime bug"

Lemme know if you want more details.