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Re: Embarrassing security bug in systemd

From Roberto C. Sánchez <roberto@debian.org>
Newsgroups linux.debian.user
Subject Re: Embarrassing security bug in systemd
Date 2017-12-07 03:50 +0100
Message-ID <uTUq6-7d-5@gated-at.bofh.it> (permalink)
References <uTQcO-62s-9@gated-at.bofh.it> <uTQFQ-6bk-9@gated-at.bofh.it> <uTRsd-6Kx-7@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Thu, Dec 07, 2017 at 12:18:30PM +1300, Ben Caradoc-Davies wrote:
> On 07/12/17 11:30, Roberto C. Sánchez wrote:
> > I too consider this a rather serious bug.  However, I do not see any
> > evidence in the BTS [0] that such a bug has yet been reported against
> > systemd.
> 
> Not a bug. We can file this one alongside "console user has access to
> keyboard". Where did I out that CVE?
> 
Actually not.  In my case I use GDM.  I have a configuration directive
in /etc/gdm3/greeter.dconf-defaults as follows:

disable-restart-buttons=true

Since I have decided to let GDM manage graphical login and otherwise
depended on the fact that in order to reboot from a TTY or remote
session root permissions are required, I find systemd's behavior to be
buggy.

> Five seconds of Googling informed me that systemd-inhibit can be used to
> prevent shutdown. If you are absolutely sure that you want to wreck the
> well-thought-out privileges for console users, craft a polkit rule. If you
> only want to avoid accidents, install molly-guard.
> 
This is not something that I should have to Google.  I previously had a
working configuration that prevented halting or rebooting the system by
all non-root users.  Then I upgraded, got systemd and it turns out that
my configuration has been silently broken for a very long time.  The
fact that systemd does not respect conventions (i.e., must be root to
halt/reboot) or established configuration directives (i.e., in display
managers) should have at the very least been included in the release
notes.

This is the kind of nonsense that makes people dislike systemd.  The
priviliges for console users were already well thought out *BEFORE*
systemd, then systemd came along and wrecked it.  This is certainly not
the only example where systemd does something like this.

Regards,

-Roberto

-- 
Roberto C. Sánchez

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Thread

Embarrassing security bug in systemd Urs Thuermann <urs@isnogud.escape.de> - 2017-12-06 23:20 +0100
  Re: Embarrassing security bug in systemd Roberto C. Sánchez <roberto@debian.org> - 2017-12-06 23:50 +0100
    Re: Embarrassing security bug in systemd Ben Caradoc-Davies <ben@transient.nz> - 2017-12-07 00:40 +0100
      Re: Embarrassing security bug in systemd Roberto C. Sánchez <roberto@debian.org> - 2017-12-07 03:50 +0100
        Re: Embarrassing security bug in systemd deloptes <deloptes@gmail.com> - 2017-12-07 07:30 +0100
  Re: Embarrassing security bug in systemd Ben Caradoc-Davies <ben@transient.nz> - 2017-12-06 23:50 +0100
    Re: Embarrassing security bug in systemd Dave Sherohman <dave@sherohman.org> - 2017-12-07 10:40 +0100
      Re: Embarrassing security bug in systemd Tixy <tixy@yxit.co.uk> - 2017-12-07 11:30 +0100
        Re: Embarrassing security bug in systemd Jonathan Dowland <jmtd@debian.org> - 2017-12-07 11:50 +0100
          Re: Embarrassing security bug in systemd Jimmy Johnson <field.engineer@gmail.com> - 2017-12-09 03:50 +0100
            Re: Embarrassing security bug in systemd David Wright <deblis@lionunicorn.co.uk> - 2017-12-09 17:50 +0100
              Re: Embarrassing security bug in systemd Jimmy Johnson <field.engineer@gmail.com> - 2017-12-10 10:00 +0100
                Re: Embarrassing security bug in systemd David Wright <deblis@lionunicorn.co.uk> - 2017-12-10 20:40 +0100
      Re: Embarrassing security bug in systemd <tomas@tuxteam.de> - 2017-12-07 11:40 +0100
      Re: Embarrassing security bug in systemd Roberto C. Sánchez <roberto@debian.org> - 2017-12-07 16:00 +0100
        Re: Embarrassing security bug in systemd Michael Biebl <biebl@debian.org> - 2017-12-07 20:30 +0100
          Re: Embarrassing security bug in systemd <tomas@tuxteam.de> - 2017-12-08 09:20 +0100
          Re: Embarrassing security bug in systemd deloptes <deloptes@gmail.com> - 2017-12-08 12:40 +0100
            Re: Embarrassing security bug in systemd <tomas@tuxteam.de> - 2017-12-08 13:40 +0100
              Re: Embarrassing security bug in systemd deloptes <deloptes@gmail.com> - 2017-12-08 21:40 +0100
            Re: Embarrassing security bug in systemd Jonathan Dowland <jmtd@debian.org> - 2017-12-08 17:10 +0100
              Re: Embarrassing security bug in systemd Curt <curty@free.fr> - 2017-12-08 19:10 +0100
              Re: Embarrassing security bug in systemd Menelaos Maglis <mmaglis@metacom.gr> - 2017-12-08 19:40 +0100
              Re: Embarrassing security bug in systemd Menelaos Maglis <mmaglis@metacom.gr> - 2017-12-08 19:50 +0100
                Re: Embarrassing security bug in systemd Jonathan Dowland <jmtd@debian.org> - 2017-12-08 20:50 +0100
                Re: Embarrassing security bug in systemd Brian <ad44@cityscape.co.uk> - 2017-12-08 21:20 +0100
                Re: Embarrassing security bug in systemd Jonathan Dowland <jmtd@debian.org> - 2017-12-09 09:10 +0100
                Re: Embarrassing security bug in systemd Brian <ad44@cityscape.co.uk> - 2017-12-09 11:20 +0100
                Re: Embarrassing security bug in systemd Jonathan Dowland <jmtd@debian.org> - 2017-12-09 19:40 +0100
                Re: Embarrassing security bug in systemd Dejan Jocic <jodejka@gmail.com> - 2017-12-09 20:30 +0100
                Re: Embarrassing security bug in systemd Brian <ad44@cityscape.co.uk> - 2017-12-09 22:00 +0100
                Re: Embarrassing security bug in systemd Dejan Jocic <jodejka@gmail.com> - 2017-12-10 00:40 +0100
                Re: Embarrassing security bug in systemd Joe <joe@jretrading.com> - 2017-12-10 10:40 +0100
                Re: Embarrassing security bug in systemd Dejan Jocic <jodejka@gmail.com> - 2017-12-10 11:20 +0100
                Re: Embarrassing security bug in systemd Joe <joe@jretrading.com> - 2017-12-10 12:40 +0100
                Re: Embarrassing security bug in systemd Dejan Jocic <jodejka@gmail.com> - 2017-12-10 16:10 +0100
                Re: Embarrassing security bug in systemd Brian <ad44@cityscape.co.uk> - 2017-12-11 15:10 +0100
                Re: Embarrassing security bug in systemd Roberto C. Sánchez <roberto@debian.org> - 2017-12-09 21:10 +0100
                Re: Embarrassing security bug in systemd Brian <ad44@cityscape.co.uk> - 2017-12-09 21:10 +0100
                Re: Embarrassing security bug in systemd Gene Heskett <gheskett@shentel.net> - 2017-12-08 21:50 +0100
                Re: Embarrassing security bug in systemd John Hasler <jhasler@newsguy.com> - 2017-12-08 22:30 +0100
                Re: Embarrassing security bug in systemd Glenn English <ghe2001@gmail.com> - 2017-12-09 02:50 +0100
                Re: Embarrassing security bug in systemd John Hasler <jhasler@newsguy.com> - 2017-12-09 06:50 +0100
                Re: Embarrassing security bug in systemd Jonathan Dowland <jmtd@debian.org> - 2017-12-09 09:20 +0100
                Re: Embarrassing security bug in systemd Jonathan Dowland <jmtd@debian.org> - 2017-12-09 09:10 +0100
                Re: Embarrassing security bug in systemd Christian Seiler <christian@iwakd.de> - 2017-12-15 13:30 +0100
                Re: Embarrassing security bug in systemd Gene Heskett <gheskett@shentel.net> - 2017-12-15 14:10 +0100
                Re: Embarrassing security bug in systemd John Hasler <jhasler@newsguy.com> - 2017-12-15 16:00 +0100
                Re: Embarrassing security bug in systemd Gene Heskett <gheskett@shentel.net> - 2017-12-08 21:50 +0100
                Re: Embarrassing security bug in systemd <tomas@tuxteam.de> - 2017-12-08 22:40 +0100
                Re: Embarrassing security bug in systemd John Hasler <jhasler@newsguy.com> - 2017-12-09 00:30 +0100
                Re: Embarrassing security bug in systemd <tomas@tuxteam.de> - 2017-12-09 10:00 +0100
        Re: Embarrassing security bug in systemd Dave Sherohman <dave@sherohman.org> - 2017-12-08 10:00 +0100
      Re: Embarrassing security bug in systemd Cindy-Sue Causey <butterflybytes@gmail.com> - 2017-12-08 23:40 +0100
        Re: Embarrassing security bug in systemd Joe <joe@jretrading.com> - 2017-12-09 00:30 +0100
          Re: Embarrassing security bug in systemd Brian <ad44@cityscape.co.uk> - 2017-12-09 01:20 +0100
            Re: Embarrassing security bug in systemd Joe <joe@jretrading.com> - 2017-12-09 11:40 +0100
              Re: Embarrassing security bug in systemd Brian <ad44@cityscape.co.uk> - 2017-12-09 15:30 +0100
                Re: Embarrassing security bug in systemd The Wanderer <wanderer@fastmail.fm> - 2017-12-10 01:00 +0100
                Re: Embarrassing security bug in systemd Brian <ad44@cityscape.co.uk> - 2017-12-10 22:20 +0100
              Re: Embarrassing security bug in systemd Gene Heskett <gheskett@shentel.net> - 2017-12-09 17:50 +0100
                Re: Embarrassing security bug in systemd David Wright <deblis@lionunicorn.co.uk> - 2017-12-09 18:20 +0100
                Re: Embarrassing security bug in systemd Gene Heskett <gheskett@shentel.net> - 2017-12-09 21:20 +0100
                Re: Embarrassing security bug in systemd <tomas@tuxteam.de> - 2017-12-10 12:00 +0100
                Re: Embarrassing security bug in systemd Gene Heskett <gheskett@shentel.net> - 2017-12-10 17:10 +0100
                Re: Embarrassing security bug in systemd David Wright <deblis@lionunicorn.co.uk> - 2017-12-10 20:40 +0100
                Re: Embarrassing security bug in systemd Brian <ad44@cityscape.co.uk> - 2017-12-10 21:30 +0100
                Re: Embarrassing security bug in systemd Gene Heskett <gheskett@shentel.net> - 2017-12-10 23:10 +0100
                Re: Embarrassing security bug in systemd Brian <ad44@cityscape.co.uk> - 2017-12-11 00:10 +0100
                Re: Embarrassing security bug in systemd Gene Heskett <gheskett@shentel.net> - 2017-12-11 00:50 +0100
                Re: Embarrassing security bug in systemd Brian <ad44@cityscape.co.uk> - 2017-12-11 12:30 +0100
                Re: Embarrassing security bug in systemd Gene Heskett <gheskett@shentel.net> - 2017-12-11 13:40 +0100
                Re: Embarrassing security bug in systemd <tomas@tuxteam.de> - 2017-12-11 14:40 +0100
                Re: Embarrassing security bug in systemd <tomas@tuxteam.de> - 2017-12-10 21:50 +0100
                Re: Embarrassing security bug in systemd Eduardo M KALINOWSKI <eduardo@kalinowski.com.br> - 2017-12-11 13:00 +0100
                Re: Embarrassing security bug in systemd <tomas@tuxteam.de> - 2017-12-11 13:40 +0100
                Re: Embarrassing security bug in systemd David Wright <deblis@lionunicorn.co.uk> - 2017-12-11 16:30 +0100
                Re: Embarrassing security bug in systemd Gene Heskett <gheskett@shentel.net> - 2017-12-10 23:10 +0100
                Re: Embarrassing security bug in systemd David Wright <deblis@lionunicorn.co.uk> - 2017-12-11 01:30 +0100
                Re: Embarrassing security bug in systemd Gene Heskett <gheskett@shentel.net> - 2017-12-11 04:40 +0100
                Re: Embarrassing security bug in systemd David Wright <deblis@lionunicorn.co.uk> - 2017-12-11 06:10 +0100
                Re: Embarrassing security bug in systemd Gene Heskett <gheskett@shentel.net> - 2017-12-11 07:40 +0100
                Rust? (and a wordsmithing question) (was: Re: Embarrassing security bug in systemd) rhkramer@gmail.com - 2017-12-11 15:40 +0100
                Re: Rust? (and a wordsmithing question) (was: Re: Embarrassing  security bug in systemd) Darac Marjal <mailinglist@darac.org.uk> - 2017-12-11 16:00 +0100
                Re: Rust? (and a wordsmithing question) (was: Re: Embarrassing security bug in systemd) rhkramer@gmail.com - 2017-12-11 18:30 +0100
                Re: Rust? (and a wordsmithing question) (was: Re: Embarrassing  security bug in systemd) Joe <joe@jretrading.com> - 2017-12-11 16:30 +0100
                Re: Rust? (and a wordsmithing question) "James H. H. Lampert" <jamesl@touchtonecorp.com> - 2017-12-11 17:40 +0100
                Re: Rust? (and a wordsmithing question) David Wright <deblis@lionunicorn.co.uk> - 2017-12-11 20:10 +0100
                Re: Rust? (and a wordsmithing question) <tomas@tuxteam.de> - 2017-12-12 09:30 +0100
                Re: Rust? (and a wordsmithing question) "James H. H. Lampert" <jamesl@touchtonecorp.com> - 2017-12-12 17:30 +0100
                Re: Rust? (and a wordsmithing question) <tomas@tuxteam.de> - 2017-12-12 17:50 +0100
                Re: Rust? (and a wordsmithing question) Curt <curty@free.fr> - 2017-12-12 18:20 +0100
                Re: Rust? (and a wordsmithing question) Richard Hector <richard@walnut.gen.nz> - 2017-12-13 04:40 +0100
                Re: Rust? (and a wordsmithing question) (was: Re: Embarrassing security bug in systemd) rhkramer@gmail.com - 2017-12-11 18:30 +0100
                Re: Rust? (and a wordsmithing question) (was: Re: Embarrassing  security bug in systemd) David Wright <deblis@lionunicorn.co.uk> - 2017-12-12 19:10 +0100
                UID 1000 on Raspberry Pi (Was: Re: Embarrassing security bug in  systemd) Jason <electron@emypeople.net> - 2018-01-09 05:10 +0100
                Re: UID 1000 on Raspberry Pi (Was: Re: Embarrassing security bug in  systemd) Christian Groessler <chris@groessler.org> - 2018-01-09 16:00 +0100
                Re: UID 1000 on Raspberry Pi (Was: Re: Embarrassing security bug in  systemd) Roberto C. Sánchez <roberto@debian.org> - 2018-01-09 16:30 +0100
                Re: UID 1000 on Raspberry Pi (Was: Re: Embarrassing security bug in  systemd) Christian Groessler <chris@groessler.org> - 2018-01-09 18:10 +0100
                Re: UID 1000 on Raspberry Pi (Was: Re: Embarrassing security bug in  systemd) Erik Christiansen <dvalin@internode.on.net> - 2018-01-10 04:50 +0100
          Re: Embarrassing security bug in systemd Menelaos Maglis <mmaglis@metacom.gr> - 2017-12-09 01:40 +0100
            Re: Embarrassing security bug in systemd Mark Fletcher <mark27q1@gmail.com> - 2017-12-09 03:10 +0100
              Re: Embarrassing security bug in systemd Joe <joe@jretrading.com> - 2017-12-09 10:50 +0100
        Re: Embarrassing security bug in systemd Ric Moore <wayward4now@gmail.com> - 2017-12-09 16:40 +0100
          Re: Embarrassing security bug in systemd Tom Furie <tom@furie.org.uk> - 2017-12-09 17:10 +0100
            Re: Embarrassing security bug in systemd Ben Caradoc-Davies <ben@transient.nz> - 2017-12-09 22:10 +0100
          Re: Embarrassing security bug in systemd David Wright <deblis@lionunicorn.co.uk> - 2017-12-09 18:20 +0100
  Re: Embarrassing security bug in systemd Michael Stone <mstone@debian.org> - 2017-12-07 00:00 +0100
    Re: Embarrassing security bug in systemd Joe <joe@jretrading.com> - 2017-12-07 09:40 +0100
  Re: Embarrassing security bug in systemd Glenn English <ghe2001@gmail.com> - 2017-12-07 00:10 +0100
  Re: Embarrassing security bug in systemd Brian <ad44@cityscape.co.uk> - 2017-12-07 00:10 +0100
    Re: Embarrassing security bug in systemd Roberto C. Sánchez <roberto@debian.org> - 2017-12-07 03:50 +0100
  Re: Embarrassing security bug in systemd Michael Lange <klappnase@freenet.de> - 2017-12-07 00:20 +0100
    Re: Embarrassing security bug in systemd "James H. H. Lampert" <jamesl@touchtonecorp.com> - 2017-12-07 00:50 +0100
      Re: Embarrassing security bug in systemd Michael Stone <mstone@debian.org> - 2017-12-07 01:20 +0100
        Re: Embarrassing security bug in systemd Roberto C. Sánchez <roberto@debian.org> - 2017-12-07 03:50 +0100
      Re: Embarrassing security bug in systemd David Wright <deblis@lionunicorn.co.uk> - 2017-12-07 02:10 +0100
        Re: Embarrassing security bug in systemd Nicholas Geovanis <nickgeovanis@gmail.com> - 2017-12-07 03:40 +0100
          Re: Embarrassing security bug in systemd Eric S Fraga <e.fraga@ucl.ac.uk> - 2017-12-07 08:30 +0100
    Re: Embarrassing security bug in systemd Michael Biebl <biebl@debian.org> - 2017-12-07 00:50 +0100
      Re: Embarrassing security bug in systemd Dejan Jocic <jodejka@gmail.com> - 2017-12-07 02:40 +0100
      Re: Embarrassing security bug in systemd Menelaos Maglis <mmaglis@metacom.gr> - 2017-12-08 10:40 +0100
        Re: Embarrassing security bug in systemd Roberto C. Sánchez <roberto@debian.org> - 2017-12-08 13:40 +0100
          Re: Embarrassing security bug in systemd deloptes <deloptes@gmail.com> - 2017-12-08 20:10 +0100
  Re: Embarrassing security bug in systemd David Wright <deblis@lionunicorn.co.uk> - 2017-12-07 01:10 +0100
  Re: Embarrassing security bug in systemd Eric S Fraga <e.fraga@ucl.ac.uk> - 2017-12-07 08:30 +0100
  Re: Embarrassing security bug in systemd David Baron <dbaron770@gmail.com> - 2017-12-07 08:50 +0100

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