cross-posted from: https://lemmy.pt/post/5733711
A severe vulnerability in OpenSSH, dubbed “regreSSHion” (CVE-2024-6387), has been discovered by the Qualys Threat Research Unit, potentially exposing
musl isn’t vulnerable, as per https://fosstodon.org/@musl/112711796005712271
The exploit isn’t that practicable, since it takes a very long time on 32 bit systems, which are ever rarer to see.
They could get RasPis below 4th gen running outdated software, I guess. I think I read elsewhere that Debian already had a patch out some time ago, so that number is also likely diminishingly small.
I have no idea when I last updated my RasPi 0s (none of which is exposed to the public).
Most images and distros are just Raspbian at their core and as such are pretty easy to upgrade.
I upgraded my homebridge/pihole from Bullseye to Bookworm just a few days ago and it went off without a hitch.
But it isn’t musl based? And I never heard it had anything except for the rolling release?
Question if I update my server and it has the new SSH (patched) package. Is that enough or do I have to restart the server as well? How can I check if the old SSH is in use currently?
Some package managers have a command to see if anything is in need of restart. Zypper has ps -s for example. I’d restart to be sure though.
My server tells me a restart would be required because of:
linux-base linux-image-6.1.0-22-amd64
Does that have anything to do with the SSH package?
It sounds like it’s the kernel but whether it has anything to do with ssh, I really don’t know. Sometimes parts work together in surprising ways, as I learned with the recent sshd/systemd/xz exploit.
You might be fine and this was the most alarming exploit since it’s very inconvenient, but personally I’d restart just to be sure.
No - it’s the kernel image - the actual operating system, rather than a service that runs on top of it.
If you just want to restart your ssh service after updating the packages, then “systemctl restart sshd” is all that’s needed, although you should probably reboot whenever the package manager suggests as a general good habit.
The packages in most distros will also restart the server for you. Any existing SSH sessions will technically be running in vulnerable versions, but if I’m understanding the vulnerability correctly this isn’t a problem, as they won’t be trying to authenticate a user.
If you want to be sure, you can manually restart the ssh server yourself. On most distros sudo systemctl restart sshd should do it.
Worth noting this only affects the portable release of OpenSSH, so OpenBSD (or anyone else using the native release) are unaffected.
