TLDR: on Oct 2, 333 exits (~10% of Tor exits) started redirecting port 22 to 12 interception servers running a paramiko-based MITM that stole passwords and tried to drop Ebury on the target.
On Friday Oct 2, 09:35am, 333 infected exit nodes started a coordinated campaign to intercept SSH connections and gather as much unencrypted data as possible.
To give you a sense of scale, all of Tor has around 3000 exit relays, so roughly 10% were under their control.
SSH MitM attacks are nothing new, and very easy to pull off. To secure yourself, use key authentication instead of passwords, and don’t ignore the warning that SSH will give you saying “WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED”.
If you are using something like Tails, you will need to make sure to persist the ssh hosts key file (~/.ssh/known_hosts), or else you will not not be warned when a MitM attack is being performed.
More discussion here: https://news.ycombinator.com/item?id=50166257
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If your remote host changes and you don’t know why, and login anyway, it’s on you.
Dirty trick tho, could definitely have caught me if I was in a lazy mood.
Side note, why ssh over 22 anyway? It’s so easy to change just to avoid lazy bots.