Apple have released iLIfe support version 8.3.1 which addresses three security issues with the ImageIO component.

These addresses issues in Mac OSX releases 10.4.9 through 10.4.11 and can be found on the Apple support site.

The following CVE's are covered:

CVE-2008-2327 : Viewing a maliciously crafted TIFF image may lead to an unexpected application termination or arbitrary code execution

CVE-2008-2332 : Viewing a maliciously crafted TIFF image may lead to an unexpected application termination or arbitrary code execution

CVE-2008-3608 : Viewing a large maliciously crafted JPEG image may lead to an unexpected application termination or arbitrary code execution

Apple indicate that if your on Leopard version 10.5.5 this is already fixed, so it would appear that if your not at 10.5.5 you should upgrade for these issues too.