Linux

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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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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 (1 children)

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.