Spoiled onions and Tor exit relays [LWN.net]

Spoiled onions and Tor exit relays

Posted Jan 30, 2014 15:45 UTC (Thu) by raven667 (subscriber, #5198)
In reply to: Spoiled onions and Tor exit relays by johill
Parent article: Spoiled onions and Tor exit relays

And they can only forge certs very very rarely, like what was done for Stuxnet, so this could only be used against pretty high-value targets. And certificate pinning could detect it, once detected the whole thing is kind of blown and you can't do it anymore.

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Spoiled onions and Tor exit relays

Posted Jan 30, 2014 16:36 UTC (Thu) by njwhite (guest, #51848) [Link]

Exactly, and as the exit relay can't tell who it's relaying data for (at least without controlling a significant portion of the Tor network), it won't work. It's too high value a technique to use unless you're confident of your target.

I suppose if the exit monitored the traffic looking for e.g. a specific username being entered in plaintext on a certain site it could MITM, but even then you'd struggle, as IIRC tor switches circuits every 10 minutes anyway.