Possible Arbitrary Code Execution in Image Processing

Image processing, e.g. for generating thumbnails, is actually delegated to ImageMagick (or GraphicsMagick) for the low-level processing. Whenever ImageMagick is invoked in order to convert data the mime-type of the source is identified for invoking according coders when reading data. In case an attacker manages to upload an image file containing PostScript code it will be executed on the server system when generating according visual previews or thumbnails.