Resolve TROVE-2020-002

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.