[tor-bugs] #22753 [Core Tor/Tor]: Resolve TROVE-2017-006: Regression in guard family avoidance in 0.3.0 series (was: Resolve TROVE-2017-006)

Tor Bug Tracker & Wiki blackhole at torproject.org
Thu Jun 29 13:47:42 UTC 2017


#22753: Resolve TROVE-2017-006: Regression in guard family avoidance in 0.3.0
series
-------------------------------------------------+-------------------------
 Reporter:  nickm                                |          Owner:
     Type:  defect                               |         Status:  new
 Priority:  High                                 |      Milestone:  Tor:
                                                 |  0.3.2.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Major                                |     Resolution:
 Keywords:  030-backport 031-backport tor-       |  Actual Points:
  client guard-selection                         |
Parent ID:                                       |         Points:  1
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by nickm):

 * priority:  Medium => High
 * points:   => 1
 * keywords:  030-backport 031-backport => 030-backport 031-backport tor-
     client guard-selection
 * severity:  Normal => Major


Old description:



New description:

 In 0.3.0, when I revised the guard selection code, I got the "don't use
 your exit as first-hop if even if it's your  guard" logic right, but I
 accidentally omitted "don't use anything in the exit's family as a guard."

 The impact here is that some circuits will still use a guard on the same
 circuit as an exit even when the two are in the same family.

 (Putting this issue up on the tracker now because knowing about it does
 not (much) help an attacker exploit it.)

 This is TROVE-2017-006 and CVE-2017-0377.

--

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22753#comment:3>
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