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Groups > muc.lists.netbsd.tech.security > #214

Re: hardlinks to setuid binaries

From Joerg Sonnenberger <joerg@bec.de>
Newsgroups muc.lists.netbsd.tech.security
Subject Re: hardlinks to setuid binaries
Date 2022-03-27 22:08 +0200
Organization Newsgate at muc.de e.V.
Message-ID <YkDENW2pDkWu7i8V@bec.de> (permalink)
References <20220325133738.GS1131@netmeister.org>

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Am Fri, Mar 25, 2022 at 09:37:38AM -0400 schrieb Jan Schaumann:
> Any thoughts on this?  Should there be a sysctl to
> disable this?  This is not a new discovery; has this
> been discussed before?

The long standing recommendation is to separate user-writeable
filesystems from system filesystems. It solves a number of different
"attack" vectors at the same time. If root is going to create suid
binaries in /tmp, they kind of asked for it to be abused.

IMO nothing should be done here.

Joerg

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Thread

hardlinks to setuid binaries Jan Schaumann <jschauma@netmeister.org> - 2022-03-25 09:37 -0400
  Re: hardlinks to setuid binaries Michael Richardson <mcr@sandelman.ca> - 2022-03-25 16:21 +0100
    Re: hardlinks to setuid binaries "Jonathan A. Kollasch" <jakllsch@kollasch.net> - 2022-03-25 11:12 -0500
    Re: hardlinks to setuid binaries George Georgalis <george@galis.org> - 2022-03-25 10:06 -0700
  Re: hardlinks to setuid binaries Jan Schaumann <jschauma@netmeister.org> - 2022-03-25 17:34 -0400
  Re: hardlinks to setuid binaries Robert Elz <kre@munnari.OZ.AU> - 2022-03-26 04:42 +0700
    Re: hardlinks to setuid binaries Brook Milligan <brook@nmsu.edu> - 2022-03-25 15:51 -0600
    Re: hardlinks to setuid binaries Jan Schaumann <jschauma@netmeister.org> - 2022-03-25 18:29 -0400
      Re: hardlinks to setuid binaries Taylor R Campbell <campbell+netbsd-tech-security@mumble.net> - 2022-03-25 23:00 +0000
        Re: hardlinks to setuid binaries David Sainty <david.sainty@gmail.com> - 2022-03-26 18:58 +1300
        Re: hardlinks to setuid binaries Martin Husemann <martin@duskware.de> - 2022-03-26 07:05 +0100
          Re: hardlinks to setuid binaries Simon Burge <simonb@NetBSD.org> - 2022-03-26 17:17 +1100
          Re: hardlinks to setuid binaries Valery Ushakov <uwe@stderr.spb.ru> - 2022-03-26 17:47 +0300
  Re: hardlinks to setuid binaries Taylor R Campbell <campbell+netbsd-tech-security@mumble.net> - 2022-03-26 11:19 +0000
  Re: hardlinks to setuid binaries David Sainty <david.sainty@gmail.com> - 2022-03-27 00:45 +1300
  Re: hardlinks to setuid binaries Jan Schaumann <jschauma@netmeister.org> - 2022-03-26 11:52 -0400
  Re: hardlinks to setuid binaries Thor Lancelot Simon <tls@panix.com> - 2022-03-27 13:47 -0400
  Re: hardlinks to setuid binaries Joerg Sonnenberger <joerg@bec.de> - 2022-03-27 22:08 +0200
    re: hardlinks to setuid binaries matthew green <mrg@eterna.com.au> - 2022-03-28 23:42 +1100
      Re: hardlinks to setuid binaries George Georgalis <george@galis.org> - 2022-03-30 18:00 -0700
        Re: hardlinks to setuid binaries Michael Richardson <mcr@sandelman.ca> - 2022-03-31 12:58 -0400
          Re: hardlinks to setuid binaries Steffen Nurpmeso <steffen@sdaoden.eu> - 2022-03-31 19:09 +0200
            Re: hardlinks to setuid binaries George Georgalis <george@galis.org> - 2022-04-01 15:37 -0700
              Re: hardlinks to setuid binaries Steffen Nurpmeso <steffen@sdaoden.eu> - 2022-04-02 01:21 +0200
    Re: hardlinks to setuid binaries David Holland <dholland-security@netbsd.org> - 2022-03-28 20:35 +0000
  Re: hardlinks to setuid binaries David Holland <dholland-security@netbsd.org> - 2022-03-27 23:22 +0000

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