A severe vulnerability in OpenSSH, dubbed "regreSSHion" (CVE-2024-6387), has been discovered by the Qualys Threat Research Unit, potentially exposing

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

  • dino@discuss.tchncs.deEnglish
    16·
    5 months ago

    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?

    • Skull giver@popplesburger.hilciferous.nl
      17·
      5 months ago

      Restart your ssh server to be sure (probably sudo systemctl restart sshd). No need to reboot your server for this.

      I don’t know how reliable this is, but I usually go into htop to check if stuff needs to be restarted. Processes in red have been replaced or removed since starting.

      That said, regular server reboots are a good idea to make sure kernel patches are applied. Can’t go wrong with a reboot just in case.

    • Kusimulkku@lemm.ee
      6·
      5 months ago

      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.

      • dino@discuss.tchncs.deEnglish
        2·
        5 months ago

        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?

        • Kusimulkku@lemm.ee
          2·
          5 months ago

          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.

        • DigitalDilemma@lemmy.mlEnglish
          1·
          5 months ago

          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.

    • fakeaustinfloyd@ttrpg.network
      3·
      5 months ago

      For anyone in RHEL / Fedora land (or using dnf somewhere else), try dnf needs-restarting to list executables that have mismatched files on disk vs memory. The -r flag will hint if a reboot is needed (due to things like kernel or glibc changes)

    • lengau@midwest.social
      1·
      5 months ago

      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.