[tor-bugs] #13893 [Tor Browser]: Torbrowser crashes on start when using MS EMET 5.x

Tor Bug Tracker & Wiki blackhole at torproject.org
Mon Jan 18 22:46:46 UTC 2016

#13893: Torbrowser crashes on start when using MS EMET 5.x
 Reporter:  Diapolo                              |          Owner:  gk
     Type:  defect                               |         Status:
 Priority:  High                                 |  needs_revision
Component:  Tor Browser                          |      Milestone:
 Severity:  Blocker                              |        Version:
 Keywords:  tbb-security, TorBrowserTeam201601,  |     Resolution:
  GeorgKoppen201601                              |  Actual Points:
Parent ID:                                       |         Points:
  Sponsor:  SponsorU                             |
Changes (by bugzilla):

 * keywords:
     tbb-crash, tbb-usability-stoppoint-app, TorBrowserTeam201601,
     => tbb-security, TorBrowserTeam201601, GeorgKoppen201601
 * severity:  Normal => Blocker


 Sorry for spam, but Mozilla fixed its bug, stated in comment:16, in FF 44b
 and later: https://hg.mozilla.org/releases/mozilla-beta/rev/71d087ecddc0
 So, disabling IOInterposer was right solution.
 But, as stated in comment:19, AvailableMemoryTracker is another bad stuff
 from Mozilla and can be disabled too - proof:
 Only two craps from all the FF code use WindowsDllInterceptor, which is an
 interceptor (by name too :) that means "hacking" technique is used. This
 is unacceptable by any security mitigation tool, such as EMET.
 EMET closes Tor Browser when detects security hole in it that can be
 exploited by SimExecFlow technique. So, it is not a crash, but security
 Usability of Tor Browser = zero in secured environments (protected by EMET
 or else), so severity is set to blocker (because EMET blocks unsecured TBB
 and this blocks TBB from using).

Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13893#comment:31>
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