ImageMagick is "a suite of image manipulation tools (animate, composite, conjure, convert, display, identify, import, mogrify and montage) that are sometimes used by other applications for processing image files". Remote exploitation of multiple integer overflow vulnerabilities in ImageMagick, as included in various vendors' operating system distributions, allows attackers to crash applications using the ImageMagick library, and in some cases, execute arbitrary code.
http://www.securiteam.com/unixfocus/5KP0N1FMKM.html
