- From: Gareth Heyes <gazheyes@gmail.com>
- Date: Sat, 29 Jan 2011 21:26:42 +0000
- To: "sird@rckc.at" <sird@rckc.at>
- Cc: Adam Barth <w3c@adambarth.com>, Devdatta Akhawe <dev.akhawe@gmail.com>, Michal Zalewski <lcamtuf@coredump.cx>, Brandon Sterne <bsterne@mozilla.com>, "public-web-security@w3.org" <public-web-security@w3.org>
Well have we not learnt anything, srcdoc takes over src and includes a unlimited amount of encoded html that renders, I can see why a lot of people thought it was a bad idea. I remember your attribute reader point but I didnt realize that attributes could be used for html. Sent from my secret lair On 29 Jan 2011, at 20:28, "sird@rckc.at" <sird@rckc.at> wrote: > If there's srcdoc and src, then srcdoc takes precedence. > > I do agree seamless iframes are kinda shady, and, for example, are > useful for CSS attribute reading, but well.. there was a thread about > this before. > > Greetings > -- Eduardo > > > > > On Sat, Jan 29, 2011 at 3:18 AM, gaz Heyes <gazheyes@gmail.com> wrote: >> Haha this is hilarious if seamless iframes are allowed in seamless iframes >> we have a HTML inception vector :D >> >> <iframe sandbox=allow-same-origin seamless=seamless >> srcdoc="<iframe sandbox=allow-same-origin seamless=seamless srcdoc='&#60;&#105;&#102;&#114;&#97;&#109;&#101;&#32;&#115;&#97;&#110;&#100;&#98;&#111;&#120;&#61;&#97;&#108;&#108;&#111;&#119;&#45;&#115;&#97;&#109;&#101;&#45;&#111;&#114;&#105;&#103;&#105;&#110;&#32;&#115;&#101;&#97;&#109;&#108;&#101;&#115;&#115;&#61;&#115;&#101;&#97;&#109;&#108;&#101;&#115;&#115;&#32;&#115;&#114;&#99;&#100;&#111;&#99;&#61;&#84;&#105;&#109;&#101;&#95;&#105;&#115;&#95;&#115;&#108;&#111;&#119;&#101;&#114;&#95;&#104;&#101;&#114;&#101;&#62;&#60;&#47;&#105;&#102;&#114;&#97;&#109;&#101;&#62;'></iframe>"></iframe> >> >> What would be interesting is what happens when there's src and srcdoc, >> because if we find an injection in src attribute we can inject this. >> >> On 28 January 2011 17:55, sird@rckc.at <sird@rckc.at> wrote: >>> >>> Hey! >>> >>> So, yes that's correct :P but you obviously html entify stuff inside >>> the attribute. >>> >>> <iframe sandbox seamless srcdoc="<?php echo >>> >>> strtr($user_input,Array("&"=>"&","\""=>""","<"=>"<",">"=>">")); >>> ?>"> >>> >>> >>> -- Eduardo >>> >>> >>> >>> >>> On Fri, Jan 28, 2011 at 11:16 AM, gaz Heyes <gazheyes@gmail.com> wrote: >>>> On 28 January 2011 16:56, sird@rckc.at <sird@rckc.at> wrote: >>>>> >>>>> Hi! >>>>> >>>>> The attribute "seamless" will do: >>>>> >>>>> 1. If you have b{color:blue} in the doc >>>>> 2. You have: >>>>> <iframe sandbox="allow-same-origin" seamless="seamless" >>>>> srcdoc="<b>xD</b>"></iframe> >>>>> 3. You get, a blue bold "xD". >>>> >>>> So it puts HTML content inside an attribute! How would it handle >>>> entities? I >>>> mean if an attribute is rendering as HTML then does ' become '? Who >>>> thought putting HTML in attributes was a good idea? Does that mean stuff >>>> like <a href=javascript&#58;alert(1)>test</a> I like the idea of >>>> externally included sandboxed HTML but not inline. >>>> >> >>
Received on Saturday, 29 January 2011 21:28:12 UTC