Msg#: 10492 posted 1:37 am on Dec 15, 2005 (gmt 0)
virii exist also in jpegs..as do many other things such as directions to illegal pron ..or images of the same or data or links to info data or sites that is /are illegal where you are ..( investigate "stenography" if you really want to understand the basics )
the only way you can be reasonably safe is to allow uploads to a sandbox ..you scan the contents with at least 3 different Av's..( and learn to read hidden / imbedded / encrypted data traces )
you then if they are shown "clean" imbed them in your pages ..
and even then you are not certain ..
there are other issues concerning your or others security involved with allowing the uploading of any data in any form to your space ..
Msg#: 10492 posted 3:32 am on Dec 18, 2005 (gmt 0)
Maybe running some rendering filters on the newly uploaded images (using a library like ImageMagick or GD), which only slightly modify the image if at all, would verify that it's actually a valid image (otherwise the rendering library would stop with an error) and break any virus code which they might contain.