[tor-bugs] #33120 [Core Tor/Tor]: Resolve TROVE-2020-002

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#33120: Resolve TROVE-2020-002
-------------------------------------------------+-------------------------
 Reporter:  nickm                                |          Owner:  nickm
     Type:  defect                               |         Status:  closed
 Priority:  High                                 |      Milestone:  Tor:
                                                 |  0.4.3.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:  fixed
 Keywords:  043-must 035-backport 041-backport   |  Actual Points:  3
  042-backport                                   |
Parent ID:                                       |         Points:  1
 Reviewer:  ahf, asn, catalyst                   |        Sponsor:
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Changes (by nickm):

 * keywords:  043-must => 043-must 035-backport 041-backport 042-backport
 * status:  needs_review => closed
 * resolution:   => fixed
 * actualpoints:   => 3


Old description:



New description:

 This is the description I posted in the changelog:
 {{{
   TROVE-2020-002 is a vulnerability affecting
   all released Tor instances since 0.2.1.5-alpha. Using this
   vulnerability, an attacker could cause Tor instances to consume a huge
   amount of CPU, disrupting their operations for several seconds or
   minutes. This attack could be launched by anybody against a relay, or
   by a directory cache against any client that had connected to it. The
   attacker could launch this attack as much as they wanted, thereby
   disrupting service or creating patterns that could aid in traffic
   analysis. This issue was found by OSS-Fuzz, and is also tracked
   as CVE-2020-10592.
 }}}

 I will post a more detailed analysis in a week or so.

 This issue is fixed in today's Tor releases: 0.3.5.10, 0.4.1.9, 0.4.2.7,
 and 0.4.3.3-alpha.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33120#comment:6>
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