W3C home > Mailing lists > Public > whatwg@whatwg.org > July 2010

[whatwg] More YouTube response

From: John Harding <jharding@google.com>
Date: Wed, 7 Jul 2010 13:54:26 -0700
Message-ID: <AANLkTikkyHlzH_ke71UXKtMKjJ27yT3A-mSGSYfAPJIU@mail.gmail.com>
MySpace is my canonical example - they allow arbitrary SWFs to be embedded
in profiles, but not <iframe>s.  Flash added support a while back that
allows containing pages to block SWFs from executing script or accessing the
contents of the page, which MySpace enforces by rewriting the <embed> tag
that users post.  Before that, yes, allowing arbitrary SWFs to be posted by
users was a huge security hole.

Regardless, I think we're all agreed on the path forward (Use <iframe>s to
embed content instead of naked <embed> tags) and just need to start moving
on it, and the ball is largely in YouTube's court on this point.

-John

On Fri, Jul 2, 2010 at 6:20 PM, Maciej Stachowiak <mjs at apple.com> wrote:

>
> On Jul 2, 2010, at 6:04 PM, Maciej Stachowiak wrote:
>
> >
> > Any site which does that has a giant security hole, since Flash can be
> used to arbitrarily script the embedding page. It's about as safe as
> allowing embedding of arbitrary off-site <script>. If you are aware of sites
> that allow embedding of arbitrary off-site Flash, you should alert them to
> the potential security risks. For example a social network site that allowed
> this would be vulnerable to a self-propagating worm.
> >
> > What I have heard before is that sites whitelist specific SWFs or Flash
> from specific domains. I'm don't have any first-hand knowledge of how sites
> actually do it.
>
> With testing I found at least one site where I can apparently embed
> arbitrary SWFs. However, this site has per-user domains, so it might be
> relatively safe. This site also allows me to embed arbitrary content in an
> <iframe>.
>
> Regards,
> Maciej
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.whatwg.org/pipermail/whatwg-whatwg.org/attachments/20100707/4fc8dfb1/attachment.htm>
Received on Wednesday, 7 July 2010 13:54:26 UTC

This archive was generated by hypermail 2.4.0 : Wednesday, 22 January 2020 16:59:24 UTC