this post was submitted on 04 May 2025
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    This week on "ancient unix hacks that are still somehow a core part of linux": Setuid (infosec.pub)
    submitted 2 weeks ago by renzev@lemmy.world to c/linuxmemes@lemmy.world
    40 comments fedilink hide all child comments
     

    Explanation for newbies: setuid is a special permission bit that makes an executable run with the permissions of its owner rather than the user executing it. This is often used to let a user run a specific program as root without having sudo access.

    If this sounds like a security nightmare, that's because it is.

    In linux, setuid is slowly being phased out by Capabilities. An example of this is the ping command which used to need setuid in order to create raw sockets, but now just needs the cap_net_raw capability. More info: https://unix.stackexchange.com/questions/382771/why-does-ping-need-setuid-permission. Nevertheless, many linux distros still ship with setuid executables, for example passwd from the shadow-utils package.

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    [–] unhrpetby@sh.itjust.works 10 points 2 weeks ago* (last edited 2 weeks ago) (8 children)

    The nosuid mount option disables this behavior per mount. Just be sure you don't use suid binaries.

    Example: sudo or doas. I replaced those with switching to a tty with an already open root account on startup. Generally faster and (for me) more secure (you need physical access to get to the tty).

    [–] uranibaba@lemmy.world 3 points 2 weeks ago (1 children)

    How do you set up the tty method?

    [–] unhrpetby@sh.itjust.works 5 points 2 weeks ago* (last edited 2 weeks ago)

    All I do is have agetty --autologin root tty2 linux run as a service. It launches on startup, and I just hit CTRL + ALT + F2 if I ever need a root shell.

    All its doing is just auto logging-in as root on TTY2.

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