[whatwg] <base> in <body>
callow_mark at hicorp.co.jp
Thu Jul 21 20:51:46 PDT 2011
> On Wed, 20 Jul 2011 05:07:05 +0200, Boris Zbarsky <bzbarsky at mit.edu>
>> That said, I'm not sure I understand the security concern. What kind
>> of whitelist-based filter would let through <script>s whose URIs it
>> does not control, exactly? Can the security concern be mitigated by
>> only allowing <base> outside <head> if the base URI it sets is
>> same-origin with the document?
> The <script> is from the page itself and uses a relative URL. The
> <base> is inserted by the attacker and causes the script to be
> requested from a server under the attacker's control.
Seems like a bug in the whitelist filter to me. Shouldn't the filter be
checking requests using the full URL just before they are dispatched?
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