[tbb-bugs] #20772 [Applications/Tor Browser]: src="data:< ; base64 images rendered when "Show images"="Blocked"

Tor Bug Tracker & Wiki blackhole at torproject.org
Fri Nov 25 23:13:49 UTC 2016

#20772: src="data:<;base64 images rendered when "Show images"="Blocked"
     Reporter:  cypherpunks               |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Immediate                 |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Blocker                   |   Keywords:
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
 Any webpages (e.g. ht tp://defensivepatentlicense.org/) that use base64
 encoding thwart people's disabling of images.
 Due to there not being enough software writers to go around, TBB and its
 derivatives e.f. Orfox(ht tps://dev.guardianproject.info/issues/8039)
 often leave remote code execution vulnerabilities in the image parser.
 Disabling images would protect against this vector of infection, but they
 can't be disabled. Due to the almost identical codebase for everything but
 the menus and window borders, I think that this is likely a bug in the TBb
 source code rather than in the tiny delta that is Orfox.

Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20772>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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