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Re: making Debian secure by default

From Andy Smith <andy@strugglers.net>
Newsgroups linux.debian.user
Subject Re: making Debian secure by default
Date 2024-03-28 17:40 +0100
Message-ID <In0Xf-2jAv-7@gated-at.bofh.it> (permalink)
References <ImJa1-27aa-1@gated-at.bofh.it> <ImVNT-2fvh-15@gated-at.bofh.it> <In0Nz-2juy-7@gated-at.bofh.it>
Organization linux.* mail to news gateway

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Hi,

On Thu, Mar 28, 2024 at 05:21:21PM +0100, Michel Verdier wrote:
> On 2024-03-28, Marc SCHAEFER wrote:
> >> Apparently the root of the security issue is that wall is a setguid program?
> >
> > a) wall must be able to write to your tty, which is not possible
> >    if wall is not installed setguid OR if people have sane permissions
> >    on their terminals (e.g. set to mesg n)
> 
> Found in /etc/login.defs :

Is login.defs actually used by modern Debian with PAM? I seem to
recall lots of things in there are controlled by PAM instead now.

Looking at all of my sessions, the terminal file for all of them is
group writeable despite "TTYPERM 0600" being in /etc/login.defs.

$ ls -la $(tty)
crw--w---- 1 andy tty 136, 0 Mar 28 16:33 /dev/pts/0
$ mesg
is y
$ mesg n
$ ls -la $(tty)
crw------- 1 andy tty 136, 0 Mar 28 16:34 /dev/pts/0

Thanks,
Andy

-- 
https://bitfolk.com/ -- No-nonsense VPS hosting

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Thread

making Debian secure by default Lee <ler762@gmail.com> - 2024-03-27 22:40 +0100
  Re: making Debian secure by default Andy Smith <andy@strugglers.net> - 2024-03-28 00:10 +0100
    Re: making Debian secure by default Lee <ler762@gmail.com> - 2024-03-28 05:30 +0100
      Re: making Debian secure by default Andy Smith <andy@strugglers.net> - 2024-03-28 14:40 +0100
        Re: making Debian secure by default Greg Wooledge <greg@wooledge.org> - 2024-03-28 16:30 +0100
          Re: making Debian secure by default Hans <hans.ullrich@loop.de> - 2024-03-28 16:50 +0100
            Re: making Debian secure by default Lee <ler762@gmail.com> - 2024-03-28 19:20 +0100
              Re: making Debian secure by default Ralph Aichinger <ra@h5.or.at> - 2024-03-29 08:50 +0100
              Re: making Debian secure by default Stefan Monnier <monnier@iro.umontreal.ca> - 2024-03-29 20:10 +0100
              Re: making Debian secure by default Jeffrey Walton <noloader@gmail.com> - 2024-03-29 20:40 +0100
          Re: making Debian secure by default Andy Smith <andy@strugglers.net> - 2024-03-28 17:00 +0100
            Re: making Debian secure by default Lee <ler762@gmail.com> - 2024-03-28 21:20 +0100
          Re: making Debian secure by default Curt <curty@free.fr> - 2024-03-28 18:50 +0100
            Re: making Debian secure by default Lee <ler762@gmail.com> - 2024-03-28 20:40 +0100
            Re: making Debian secure by default Andy Smith <andy@strugglers.net> - 2024-03-29 18:00 +0100
              Re: making Debian secure by default Joe <joe@jretrading.com> - 2024-03-29 18:30 +0100
                Re: making Debian secure by default Curt <curty@free.fr> - 2024-03-29 18:50 +0100
                Re: making Debian secure by default Nicholas Geovanis <nickgeovanis@gmail.com> - 2024-04-01 02:30 +0200
                Re: making Debian secure by default Andy Smith <andy@strugglers.net> - 2024-04-01 03:50 +0200
                Re: making Debian secure by default Roberto C. Sánchez <roberto@debian.org> - 2024-04-01 05:00 +0200
                Re: making Debian secure by default Nate Bargmann <n0nb@n0nb.us> - 2024-04-01 10:40 +0200
                Re: making Debian secure by default <tomas@tuxteam.de> - 2024-04-06 09:50 +0200
                Re: making Debian secure by default Nate Bargmann <n0nb@n0nb.us> - 2024-04-06 09:50 +0200
                Re: making Debian secure by default <tomas@tuxteam.de> - 2024-04-06 09:51 +0200
                Re: making Debian secure by default <tomas@tuxteam.de> - 2024-04-06 09:50 +0200
                Re: making Debian secure by default Andy Smith <andy@strugglers.net> - 2024-04-06 09:50 +0200
                Re: making Debian secure by default Nate Bargmann <n0nb@n0nb.us> - 2024-04-06 09:51 +0200
                Re: making Debian secure by default Andy Smith <andy@strugglers.net> - 2024-04-06 09:51 +0200
                Re: making Debian secure by default Jeffrey Walton <noloader@gmail.com> - 2024-04-06 09:51 +0200
                Re: making Debian secure by default Nate Bargmann <n0nb@n0nb.us> - 2024-04-06 09:52 +0200
                Re: making Debian secure by default Charles Curley <charlescurley@charlescurley.com> - 2024-04-06 09:52 +0200
                Re: making Debian secure by default Jeffrey Walton <noloader@gmail.com> - 2024-04-06 09:51 +0200
                Re: making Debian secure by default John Hasler <john@sugarbit.com> - 2024-04-06 09:51 +0200
                Re: making Debian secure by default Joe <joe@jretrading.com> - 2024-04-06 09:52 +0200
                Re: making Debian secure by default John Hasler <john@sugarbit.com> - 2024-04-06 09:52 +0200
                Re: making Debian secure by default Joe <joe@jretrading.com> - 2024-04-06 09:52 +0200
              Re: making Debian secure by default Curt <curty@free.fr> - 2024-03-29 18:50 +0100
                Re: making Debian secure by default Andy Smith <andy@strugglers.net> - 2024-03-29 21:00 +0100
                Re: making Debian secure by default Curt <curty@free.fr> - 2024-03-30 17:10 +0100
          Re: making Debian secure by default Lee <ler762@gmail.com> - 2024-03-28 19:10 +0100
            Re: making Debian secure by default Jeffrey Walton <noloader@gmail.com> - 2024-03-28 23:20 +0100
    Re: making Debian secure by default Florent Rougon <f.rougon@free.fr> - 2024-03-28 17:30 +0100
      Re: making Debian secure by default Florent Rougon <f.rougon@free.fr> - 2024-03-28 18:10 +0100
      Re: making Debian secure by default Greg Wooledge <greg@wooledge.org> - 2024-03-28 18:10 +0100
        Re: making Debian secure by default Florent Rougon <f.rougon@free.fr> - 2024-03-28 18:10 +0100
  Re: making Debian secure by default jeremy ardley <jeremy.ardley@gmail.com> - 2024-03-28 00:40 +0100
    Re: making Debian secure by default Andy Smith <andy@strugglers.net> - 2024-03-28 00:50 +0100
      Re: making Debian secure by default Lee <ler762@gmail.com> - 2024-03-28 05:50 +0100
  Re: making Debian secure by default <tomas@tuxteam.de> - 2024-03-28 06:20 +0100
    Re: making Debian secure by default Emanuel Berg <incal@dataswamp.org> - 2024-03-28 06:30 +0100
      Re: making Debian secure by default <tomas@tuxteam.de> - 2024-03-28 08:20 +0100
      Re: making Debian secure by default Michael Kjörling <2695bd53d63c@ewoof.net> - 2024-03-28 12:20 +0100
        Re: making Debian secure by default Emanuel Berg <incal@dataswamp.org> - 2024-03-28 12:40 +0100
          Re: making Debian secure by default David Wright <deblis@lionunicorn.co.uk> - 2024-03-28 21:40 +0100
            Re: making Debian secure by default Emanuel Berg <incal@dataswamp.org> - 2024-03-29 10:40 +0100
              Re: making Debian secure by default David Wright <deblis@lionunicorn.co.uk> - 2024-03-30 04:00 +0100
    Re: making Debian secure by default Curt <curty@free.fr> - 2024-03-28 15:50 +0100
    Re: making Debian secure by default Lee <ler762@gmail.com> - 2024-03-28 17:30 +0100
      Re: making Debian secure by default Andy Smith <andy@strugglers.net> - 2024-03-28 18:10 +0100
        Re: making Debian secure by default Lee <ler762@gmail.com> - 2024-03-28 21:50 +0100
      Re: making Debian secure by default tomas@tuxteam.de - 2024-03-28 18:30 +0100
        Re: making Debian secure by default Lee <ler762@gmail.com> - 2024-03-28 20:30 +0100
          Re: making Debian secure by default Greg Wooledge <greg@wooledge.org> - 2024-03-28 20:30 +0100
            Re: making Debian secure by default Michael Kjörling <2695bd53d63c@ewoof.net> - 2024-03-28 21:50 +0100
          Re: making Debian secure by default tomas@tuxteam.de - 2024-03-28 21:20 +0100
            Re: making Debian secure by default Curt <curty@free.fr> - 2024-03-29 17:10 +0100
              Re: making Debian secure by default debian-user@howorth.org.uk - 2024-03-29 21:50 +0100
    Re: making Debian secure by default debian-user@howorth.org.uk - 2024-03-28 22:50 +0100
  Re: making Debian secure by default Marc SCHAEFER <schaefer@alphanet.ch> - 2024-03-28 12:10 +0100
    Re: making Debian secure by default Franco Martelli <martellif67@gmail.com> - 2024-03-28 17:30 +0100
    Re: making Debian secure by default Michel Verdier <mv524@free.fr> - 2024-03-28 17:30 +0100
      Re: making Debian secure by default Andy Smith <andy@strugglers.net> - 2024-03-28 17:40 +0100
  Re: making Debian secure by default Michael Kjörling <2695bd53d63c@ewoof.net> - 2024-03-28 21:50 +0100
  Re: making Debian secure by default Richmond <dnomhcir@gmx.com> - 2024-03-28 21:50 +0100
  Re: making Debian secure by default Jeffrey Walton <noloader@gmail.com> - 2024-03-29 16:40 +0100
  Re: making Debian secure by default Andy Smith <andy@strugglers.net> - 2024-03-31 21:10 +0200
    Re: making Debian secure by default Roberto C. Sánchez <roberto@debian.org> - 2024-03-31 21:30 +0200
      Re: making Debian secure by default gene heskett <gheskett@shentel.net> - 2024-03-31 22:30 +0200
        Re: making Debian secure by default Andy Smith <andy@strugglers.net> - 2024-03-31 23:20 +0200
          Re: making Debian secure by default gene heskett <gheskett@shentel.net> - 2024-04-01 01:00 +0200

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