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[tor-bugs] #22300 [Applications/Tor Browser]: DNSstuff (http://www.dnsstuff.com/) occasionally indicates a different IP address from the exit node IP address indicated in the Torbutton menu



#22300: DNSstuff (http://www.dnsstuff.com/) occasionally indicates a different IP
address from the exit node IP address indicated in the Torbutton menu
------------------------------------------+----------------------
     Reporter:  cypherpunks               |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
------------------------------------------+----------------------
 Configuration: Tor Browser 6.5.2 for Linux (32-bit.) Tor Browser is being
 used under Xubuntu Linux 16.04.2 LTS. Under the Torbutton menu item
 "Security Settings...", the Security Level slider is set to "Low
 (default)". In NoScript, scripts are globally enabled. HTTPS Everywhere
 has been updated to 5.2.16.

 The main DNSstuff page (http://www.dnsstuff.com/) has an area near the top
 of the page where the page shows the user's IP address and the location
 (as determined by DNSstuff) for the IP address. When connecting to this
 DNSstuff page with Tor Browser, one would expect the indicated IP address
 on the DNSstuff page to be the same as the IP address for the Tor exit
 node used.

 When the Torbutton (green onion) icon in Tor Browser is clicked, the
 browser displays a menu that shows, among other things, the current Tor
 circuit under the "Tor circuit for this site" heading. In the Tor circuit
 information, three IP addresses are listed, each with a location, and from
 what one understands, the third IP address is the IP address for the exit
 node.

 In almost all instances, the DNSstuff page shows the same IP address as
 that indicated for the exit node in the Torbutton menu.

 On occasion, however, it appears that the DNSstuff page will indicate an
 IP address that is different from the one for the Tor exit node that is
 indicated in the Torbutton menu. It may be possible to reproduce this
 issue by doing the following:

 1. Load Tor Browser
 2. Go to http://www.dnsstuff.com/
 3. Once the IP address information is displayed at the top of the page,
 click the Torbutton (green onion) icon in the browser and compare the
 third IP address (that of the exit node) to the IP address that is
 displayed at the top of the DNSstuff page.
 4. If the two IP addresses match, choose "New Tor Circuit for this Site"
 from the Torbutton menu, which should cause the page to reload via a new
 Tor circuit. Then go to step 3.

 To reproduce the issue, it may be necessary to repeat the steps may times,
 i.e. more than 20 times.

 For example, in one case, the Torbutton menu indicated an exit node IP of
 193.90.12.90 and the location Norway, whereas the DNSstuff page indicated
 an IP address of 209.133.66.214 and the location Chicago, Illinois (US).
 According to a Tor node checker at https://www.dan.me.uk/torcheck, both IP
 addresses are for Tor nodes.

 As a second example, the situation happened where the Torbutton menu
 indicated an exit node IP of 185.170.41.8 and the location Panama, whereas
 the DNSstuff page indicated an IP address of 37.187.129.166 and the
 location Roubaix, Hauts-de-France (FR). According to a Tor node checker at
 https://www.dan.me.uk/torcheck, the IP address 185.170.41.8 is a Tor node,
 but 37.187.129.166 is not a Tor node.

 As a third example, the situation happened where the Torbutton menu
 indicated an exit node IP of 193.15.16.4 and the location Sweden, whereas
 the DNSstuff page indicated an IP address of 178.239.50.48 and the
 location Spijkenisse, Zuid-Holland (NL). According to a Tor node checker
 at https://www.dan.me.uk/torcheck, the IP address 193.15.16.4 is a Tor
 node, but 178.239.50.48 is not a Tor node.

 As a fourth example, the situation happened where the Torbutton menu
 indicated an exit node IP of 173.254.216.67 and the United States, whereas
 the DNSstuff page indicated an IP address of 173.254.216.66 and the
 location Los Angeles, California (US). According to a Tor node checker at
 https://www.dan.me.uk/torcheck, the IP address, both IP addresses are for
 Tor nodes.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22300>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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