After 8 security fixes last year (according to Secunia) the Danish security company CSIS named Apple Quicktime as the biggest isolated security risk of 2007. Today Apple announces its third major fix this year.

The main 5 is listed below (source: Secunia):

1. A boundary error when parsing packed scanlines from a PixData structure in a PICT file can be exploited to cause a heap-based buffer overflow via a specially crafted PICT file.
2. An error in the processing of AAC-encoded media content can be exploited to cause a memory corruption via a specially crafted media file.
3. A boundary error in the processing of PICT files can be exploited to cause a heap-based buffer overflow via a specially crafted PICT file.
4. A boundary error in the processing of Indeo video codec content can be exploited to cause a stack-based buffer overflow via a specially crafted movie file with Indeo video codec content.
5. An error in the handling of “file:” URLs can be exploited to e.g. execute arbitrary programs when playing specially crafted QuickTIme content in QuickTime Player.

As the “trend” seems to continue I’ll use alternative media players (as I’ve always done), and it appears you should do it too…