[tor-bugs] #22971 [Applications/Tor Browser]: The XPI signing mechanism needs to use different hash functions.

Wed Jul 19 08:46:47 UTC 2017

#22971: The XPI signing mechanism needs to use different hash functions.
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 Reporter:  yawning                   |          Owner:  tbb-team
     Type:  defect                    |         Status:  new
 Priority:  High                      |      Milestone:
Component:  Applications/Tor Browser  |        Version:
 Severity:  Major                     |     Resolution:
 Keywords:  tbb-security              |  Actual Points:
Parent ID:                            |         Points:
 Reviewer:                            |        Sponsor:
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Comment (by yawning):

 If I were to try to mitigate this without breaking things for lots of
 users, I would replace the SHA1 implementation used for XPI verification
 with the hardened variant that came out of the shattered.io research.

 https://github.com/cr-marcstevens/sha1collisiondetection

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22971#comment:5>
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