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[tor-bugs] #21413 [Core Tor/Tor]: Exits can get the Exit flag without having any ports in their microdescriptor port summary



#21413: Exits can get the Exit flag without having any ports in their
microdescriptor port summary
------------------------------+------------------------------
     Reporter:  teor          |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: unspecified
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:  1             |   Reviewer:
      Sponsor:                |
------------------------------+------------------------------
 Almost all clients, relays, and authorities use microdescriptors by
 default.

 Microdescriptor port summaries include a port if it exits to almost all
 IPv4 addresses (blocks no more than an IPv4 /7).

 But the Exit flag is given if at least two of ports 80, 443, 6667 exit to
 at least an IPv4 /8.

 This means an Exit can get the Exit flag, without having any of these
 ports in its IPv4 exit policy summary.

 I suggest we only award the Exit flag if an Exit has at least two of ports
 80, 443, 6667 in its IPv4 Exit policy summary.

 This also requires a spec change for the Exit flag.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21413>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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