This indicates an attempt to exploit a vulnerability in Apple Quicktime versions earlier than 7.2 on Mac OS X 10.3.9 and 10.4.9. It is possible to cause an integer overflow because the software fails to check the width field in the "smil" file. This may allow a remote attacker to cause a denial of service by sending a crafted "smil" file.
Apple QuickTime versions prior to 7.2
Denial of service.
Apply patch, available from the Web site.
Upgrade to Apple QuickTime version 7.2 for Mac:
Upgrade to Apple QuickTime version 7.2 for Windows: