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Re: [tor-bugs] #6217 [Tor Browser]: Mozilla updates queries happen at regular intervals
#6217: Mozilla updates queries happen at regular intervals
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Reporter: cypherpunks | Owner: tbb-team
Type: defect | Status: new
Priority: Medium | Milestone:
Component: Tor Browser | Version:
Severity: Major | Resolution:
Keywords: tbb-linkability, tbb-firefox-patch | Actual Points:
Parent ID: | Points:
Sponsor: |
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Changes (by cypherpunks):
* priority: Low => Medium
* severity: Normal => Major
Comment:
Besides the browser update queries to torproject.org and queries to
blocklist.addons.mozilla.org, there are addon update queries to
versioncheck-bg.addons.mozilla.org and www.eff.org (presumably for https
everywhere).
Those queries use the same circuit with socks user "--unknown--" and same
socks password. The versioncheck queries use separate streams with a
potentially unique transmission size for each. E.g.:
Stream 1: received: 4135 sent: 1057
Stream 2: received: 4136 sent: 1055
Stream 3: received: 4133 sent: 1053
Stream 4: received: 4125 sent: 1054
Users that have a few extra addons installed can be uniquely identified.
TBB should use separate circuits.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/6217#comment:7>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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