Techworld has an article here, detailing security flaws in both Apple iTunes, and Microsoft media player. The iTunes flaw affects both Windows and OSX versions and involves downloading malicious playlists. The MS Media player flaw involves the DRM (Digital Rights Management) subsystem that Microsoft created to force you to comply with the recording and movie industries draconian policies. So now it can not only stop you from backing up your legally own digital media, it can also give you Trojan horse that can totally compromise your PC, or even worse, your online banking.
Be sure to load any updates provided by both Apple and Microsoft if you do not wish to be affected by this.