A few months ago, when working on my slides for Insomni'hack, I had a few conversations with the Prezi security team. Among many defense-in-depth protections, they introduced some code forbidding access to private IP addresses. Their conversion backend (the one I exploited) was using Python urllib2, and the blacklist was implemented via the IPy library.
Given that I enjoy bypassing blacklists, I asked Prezi for this specific piece of code. And they gave it to me
more here...............http://www.agarri.fr/blog/
Given that I enjoy bypassing blacklists, I asked Prezi for this specific piece of code. And they gave it to me
more here...............http://www.agarri.fr/blog/