this post was submitted on 20 Dec 2023
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SSH protects the world’s most sensitive networks. It just got a lot weaker (arstechnica.com)
submitted 11 months ago by KarnaSubarna@lemmy.ml to c/linux@lemmy.ml
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[–] charonn0@startrek.website 68 points 11 months ago (2 children)

Even the researcher who reported this doesn't go as far as this headline.

"I am an admin, should I drop everything and fix this?"

Probably not.

The attack requires an active Man-in-the-Middle attacker that can intercept and modify the connection's traffic at the TCP/IP layer. Additionally, we require the negotiation of either ChaCha20-Poly1305, or any CBC cipher in combination with Encrypt-then-MAC as the connection's encryption mode.

[...]

"So how practical is the attack?"

The Terrapin attack requires an active Man-in-the-Middle attacker, that means some way for an attacker to intercept and modify the data sent from the client or server to the remote peer. This is difficult on the Internet, but can be a plausible attacker model on the local network.

https://terrapin-attack.com/

[–] Waluigis_Talking_Buttplug@lemmy.world 19 points 11 months ago (1 children)

If someone can gain physical access to your network, you're already fucked.

[–] Ramenator@lemmy.world 5 points 11 months ago

Yeah, if the attacker is in a position to do a MitM attack you have much larger problems than a ssh vulnerability that so far can at most downgrade the encryption of your connection in nearly all cases

[–] Chewy7324@discuss.tchncs.de 2 points 11 months ago* (last edited 11 months ago)

It definitely receives more clicks. I've posted this link here a day ago, but arstechnicas title is more engaging. My first thought was whether there's been another vulnerability found.

That said, the headline isn't as bad as it could've been.