• 1 Post
  • 405 Comments
Joined 3 years ago
Cake day: June 30th, 2023
  • InnerScientist@lemmy.worldtoTechnology@lemmy.world•Microsoft’s Secure Boot has been broken for a decade and no one noticed until nowEnglish
    30·
    2 months ago

    There exists shims that are signed by Microsoft and were not revoked. Normally this would be fine but these shims had weaknesses that allowes hackers to load any code using them. Normally the shims should only run other signed/trusted code. These vulnerable shims can be used to bypass secure boot by replacing your existing bootloader with the shim and then running rootkits/hackerOS/whatever and bypass bitlocker using TPM or just running a level 0 virus that can’t be detected by the OS on any PC which trusts Microsoft’s keys (99% of all PCs)

    To prevent this you’d have to not trust the vulnerable shims by either adding them manually to the exclusions list or using your own secure boot keys which would only trust the few bootloader files your pc uses and no other files.

    Worst case: it behaves as if secure boot wasn’t on. Without secure boot you wouldn’t need this exploit cause then you can replace the bootloader with whatever you want anyways. With or without secure boot you need administrative permission to replace the bootloader so this is only an issue after your PC is already compromised or if someone had physical access to your PC.

  • InnerScientist@lemmy.worldtoSelfhosted@lemmy.world•Managing podman quadlets, users subids and suchEnglish
    2·
    2 months ago

    I have a Server with ~16 podman services, each their own user, network namespace and uids. This is managed using NixOS and Home manager (which supports quadlets) but I am changing my setup to a single node k3s cluster with user namespaces because that seems simpler to manage. Here a snippet for how the subuids/subuids are defined:

    users.users.<username> = {
        subUidRanges = [{
            startUid = 100000+65536*( config.users.users.<username>.uid - 999);
            count = 65536;
        }];
        subGidRanges = [{
            startGid = 100000+65536*( config.users.users.<username>.uid - 999);
            count = 65536;
        }];
        home = "[...]";
        isNormalUser = true;
        linger = true;
        group = "users";
        openssh.authorizedKeys.keys = config.users.users.root.openssh.authorizedKeys.keys;
    };