Apple released a Quicktime upgrade to version 7.1 that fixes a number of vulnerabilities in the Quicktime viewer.
Normally I'd like suggest to read the release notes for details, but they are typically thin in explaining what's been fixed and/or otherwise changed.
Basically viewing crafted images:
The fixed version is available for both OS X and Windows. The best about it all is that at least we don't get the implicit insults we should only visit trusted websites.
Without more information the only option is not to use quicktime or upgrade.
Swa Frantzen - Section 66
May 12th 2006
1 decade ago