Re: File Upload with changed extension

[Robin Wood <robin@digi.ninja>]

No one has mentioned the ability to use the server as a warez server,
that could be a problem if the max upload file size is large enough.

On 4 December 2014 at 01:25, Michal Zalewski <lcamtuf () coredump cx> wrote:
> I can't say I'm convinced about other attacks discussed in this
> thread, but if you have a web server that allows arbitrary file
> uploads and then serves them back from a sensitive origin without
> taking *a lot* of additional precautions (the list of which is long
> and ever-changing), then you probably have a problem.
>
> For one, you can load the content via <embed> / <object> on evil.com,
> and have it interpreted as Flash, Silverlight, Java, or something of
> that sort - with permissions derived from the hosting origin and with
> no regard for file extensions or Content-Type. So, you get a form of
> XSS.
>
> The safest / simples approach to user-supplied non-HTML documents is
> to serve them in a separate domain, away from any sensitive UIs, etc.
>
>
> On Tue, Dec 2, 2014 at 10:44 AM, Jyotiranjan Acharya
> <jyotiranjan121 () gmail com> wrote:
> > If you are able to upload a file with a changed extension, then will
> > that be a problem?
> > For example, you can not ,in any way, upload a .exe  or .php/.jsp/.asp
> > file directly into a web App, but you can by changing their extension
> > to .JPG. What is the risk in such a case?
> >
> >
> >
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