[tbb-bugs] #16775 [Tor Browser]: about:preferences is broken with security slider set to "High"

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#16775: about:preferences is broken with security slider set to "High"
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     Reporter:  gk         |      Owner:  tbb-team
         Type:  defect     |     Status:  new
     Priority:  normal     |  Milestone:
    Component:  Tor        |    Version:
  Browser                  |   Keywords:  tbb-usability, tbb-5.0-regression
   Resolution:             |  Parent ID:
Actual Points:             |
       Points:             |
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Changes (by mcs):

 * cc: gk, mikeperry (added)


Comment:

 Kathy and I have concluded that a whitelisting mechanism is needed.  The
 most straightforward solution is to enable SVG when the URI associated
 with a document has one of the following schemes:
  about: chrome: resource:

 Doing so will fix this ticket as well as #16607.  The only downside is
 that chrome: and resource: URIs can be loaded by remote web pages, which
 means they would be able to trigger execution of SVG code in a limited
 way.  Maybe we should have another ticket to disallow that kind of load,
 but overall the risk seems acceptable.

 Before we proceed with a fix, Kathy and I would like opinions from other
 people as to whether whitelisting is safe.  gk?  mikeperry?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16775#comment:5>
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