this post was submitted on 29 Jul 2025
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SSH backdoor infection (lemmy.world)
submitted 3 days ago by IronJumbo@lemmy.world to c/linux@lemmy.world
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https://blog.thc.org/infecting-ssh-public-keys-with-backdoors

I am not a security expert and I wonder:

  1. Does the described method infect the remote or local machine (from which I connect)?
  2. Can this method be prevented? For example, correctly configuring your etc/ssh/ssh_config

It seems that every VPS supplier can hack you? The description shows that AWS does "harmless", but what if my hosting is a bad actor?

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[–] Shadow@lemmy.ca 1 points 2 days ago* (last edited 2 days ago)

Most don't create new keys per server machine but that's not the issue. I don't bother, I create a key per client machine on my side.

Server gets compromised once, admin logs in and fixes it, admin logs in next time and the backdoor compromises it again.

That's all this is. If you can get in once, it's a spot you can leave a backdoor that many admins will miss. That's it.

Admins don't generally copy that whole file around, they usually copy and paste the lines they want. Also I generally copy and paste it from my workstation, not another server.