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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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[-] fraksken@infosec.pub 10 points 11 months ago

you missed this part:

For Terrapin to be viable, the connection it interferes with also must be secured by either "ChaCha20-Poly1305" or "CBC with Encrypt-then-MAC," both of which are cipher modes added to the SSH protocol (in 2013 and 2012, respectively). A scan performed by the researchers found that 77 percent of SSH servers exposed to the Internet support at least one of the vulnerable encryption modes, while 57 percent of them list a vulnerable encryption mode as the preferred choice.

[-] steventhedev@lemmy.world 5 points 11 months ago* (last edited 11 months ago)

Also that in order to exploit this it requires an active man in the middle. Which requires any of the following:

  • Reverse proxy hijack/NAT hijack - from a compromised machine near the server
  • BGP hijack - stealing traffic to the real IP
  • DNS hijack - stealing traffic to send to a different IP
  • Malicious/compromised network transit
  • Local network gateway control
  • WAP poisoning - wifi roaming is designed really well so this is actually easier than it sounds.

Almost all of those have decent mitigations like 801.x and BGP monitoring. The best mitigation is that you can just change your client config to disable those ciphersuites though.

this post was submitted on 20 Dec 2023
73 points (66.4% liked)

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