Hello Julius, I appreciate your interest to learn more. OWASP is quite credible, and has gained some international recognition. It is a benchmark for many vendors. I suggest you to read on OSI/7-Layer Model. A website may disallow uploads of certain file types for security reasons, and let's assume at the application layer. If we manage to get past the security controls, that means we can write unrestrictedly any type of file to the remote network. That also means that we get past their firewall, since the communication is through HTTP (port 80). CDN nodes are deployed to multiple colocation (thousands of nodes and thousands of servers across the world). The files (let's say a self-executing encrypted virus like Cryptolocker? ) are cached deeply in the network across thousands of servers.
On Thu, Mar 13, 2014 at 5:07 PM, Nicholas Lemonias. < lem.niko...@googlemail.com> wrote: > Hello Julius, > > I appreciate your interest to learn more. OWASP is quite credible, and has > gained some international recognition. It is a benchmark for many vendors. > I suggest you to read on OSI/7-Layer Model. A website may disallow uploads > of certain file types for security reasons, and let's assume at the > application layer. If we manage to get past the security controls, that > means we can write unrestrictedly any type of file to the remote network. > That also means that we get past their firewall, since the communication is > through HTTP (port 80). CDN nodes are deployed to multiple colocation > (thousands of nodes and thousands of servers across the world). The files > are cached deep in the network structures to thousands of servers. > > > On Thu, Mar 13, 2014 at 4:20 PM, Julius Kivimäki < > julius.kivim...@gmail.com> wrote: > >> OWASP is recognized worldwide, so is CEH and a bunch of other morons. >> That doesn't mean their publications are worth anything. Now tell me, why >> would arbitrary file upload on a CDN lead to code execution (Besides for >> HTML, which you have been unable to confirm)? >> >> >> 2014-03-13 18:16 GMT+02:00 Nicholas Lemonias. <lem.niko...@googlemail.com >> >: >> >> *You are wrong about accessing the files. What has not been confirmed is >>> remote code execution. We are working on it.* >>> *And please, OWASP is recognised worldwide... * >>> >>> *Files can be accessed through Google Take out with a little bit of >>> skills.* >>> >>> *https://www.google.com/settings/takeout >>> <https://www.google.com/settings/takeout> * >>> >>> >>> >>> >>> On Thu, Mar 13, 2014 at 4:09 PM, Julius Kivimäki < >>> julius.kivim...@gmail.com> wrote: >>> >>>> Did you even read that article? (Not that OWASP has any sort of >>>> credibility anyways). From what I saw in your previous post you are both >>>> unable to execute the files or even access them and thus unable to >>>> manipulate the content-type the files are returned with, therefore there is >>>> no vulnerability (According to the article you linked.). >>>> >>>> BTW, you should look for more cool vulnerabilities in amazons EC2, I'm >>>> sure you will find some "Unrestricted File Upload" holes. >>>> >>>> >>>> 2014-03-13 16:18 GMT+02:00 Nicholas Lemonias. < >>>> lem.niko...@googlemail.com>: >>>> >>>> Here is your answer. >>>>> https://www.owasp.org/index.php/Unrestricted_File_Upload >>>>> >>>>> >>>>> On Thu, Mar 13, 2014 at 1:39 PM, Julius Kivimäki < >>>>> julius.kivim...@gmail.com> wrote: >>>>> >>>>>> When did the ability to upload files of arbitrary types become a >>>>>> security issue? If the file doesn't get executed, it's really not a >>>>>> problem. (Besides from potentially breaking site layout standpoint.) >>>>>> >>>>>> >>>>>> 2014-03-13 12:43 GMT+02:00 Nicholas Lemonias. < >>>>>> lem.niko...@googlemail.com>: >>>>>> >>>>>>> Google vulnerabilities uncovered... >>>>>>> >>>>>>> >>>>>>> >>>>>>> http://news.softpedia.com/news/Expert-Finds-File-Upload-Vulnerability-in-YouTube-Google-Denies-It-s-a-Security-Issue-431489.shtml >>>>>>> >>>>>>> _______________________________________________ >>>>>>> Full-Disclosure - We believe in it. >>>>>>> Charter: http://lists.grok.org.uk/full-disclosure-charter.html >>>>>>> Hosted and sponsored by Secunia - http://secunia.com/ >>>>>>> >>>>>> >>>>>> >>>>> >>>> >>> >> >
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