ImageMagick(TM) is an image display and manipulation tool for the X Window System which can read and write multiple image formats.
A format string bug was found in the way ImageMagick handles filenames. An attacker could execute arbitrary code on a victim's machine if they were able to trick the victim into opening a file with a specially crafted name. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2005-0397 to this issue.
Additionally, a bug was fixed which caused ImageMagick(TM) to occasionally segfault when writing TIFF images to standard output.
Users of ImageMagick should upgrade to these updated packages, which contain a backported patch, and are not vulnerable to these issues.