Re: should I firewall an open port which isn't used? (was ... Re: Guide(s?) to backup philosophies)

From	<tomas@tuxteam.de>
Newsgroups	linux.debian.user
Subject	Re: should I firewall an open port which isn't used? (was ... Re: Guide(s?) to backup philosophies)
Date	2017-03-31 14:20 +0200
Message-ID	<tr3H4-4uB-15@gated-at.bofh.it> (permalink)
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On Sat, Apr 01, 2017 at 01:00:45AM +1300, cbannister@slingshot.co.nz wrote:

[...]

> My understanding is that if there are no services listening on a port then
> it cannot be accessed.
> 
> e.g.
> 
> http://serverfault.com/questions/733633/if-no-service-is-listening-on-a-port-can-a-system-still-be-accessed-using-that-p
> 
> An I missing something? 

As Dominik said: it's "defense in depth". If your PHP^H^H^H web application
has some code injection issue, your adversary might well install a C&C
server listening on that port, and work from there on (exfiltrate data,
try some privelege escalation, whatever).

Now there might be other avenues for that, but security is about closing
the avenue your adversary is going to use next ;-)

regards
- -- tomás
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Thread

Guide(s?) to backup philosophies Richard Owlett <rowlett@cloud85.net> - 2017-03-11 16:20 +0100
  Re: Guide(s?) to backup philosophies David Christensen <dpchrist@holgerdanske.com> - 2017-03-11 22:10 +0100
    Re: Guide(s?) to backup philosophies Dan Purgert <dan@djph.net> - 2017-03-13 14:00 +0100
      Re: Guide(s?) to backup philosophies David Christensen <dpchrist@holgerdanske.com> - 2017-03-14 05:00 +0100
        Re: Guide(s?) to backup philosophies Dan Purgert <dan@djph.net> - 2017-03-17 11:50 +0100
          Re: Guide(s?) to backup philosophies Glenn English <ghe2001@gmail.com> - 2017-03-17 19:50 +0100
          Re: Guide(s?) to backup philosophies David Christensen <dpchrist@holgerdanske.com> - 2017-03-18 06:20 +0100
            Re: Guide(s?) to backup philosophies Dan Purgert <dan@djph.net> - 2017-03-22 11:50 +0100
              Re: Guide(s?) to backup philosophies <tomas@tuxteam.de> - 2017-03-22 11:50 +0100
                Re: Guide(s?) to backup philosophies Dan Purgert <dan@djph.net> - 2017-03-22 13:20 +0100
                Re: Guide(s?) to backup philosophies <tomas@tuxteam.de> - 2017-03-22 13:30 +0100
                Re: Guide(s?) to backup philosophies Dan Purgert <dan@djph.net> - 2017-03-23 10:30 +0100
                Re: Guide(s?) to backup philosophies <tomas@tuxteam.de> - 2017-03-23 11:10 +0100
                Re: Guide(s?) to backup philosophies Dan Purgert <dan@djph.net> - 2017-03-23 13:10 +0100
              Re: Guide(s?) to backup philosophies David Christensen <dpchrist@holgerdanske.com> - 2017-03-23 04:00 +0100
                Re: Guide(s?) to backup philosophies Dan Purgert <dan@djph.net> - 2017-03-23 10:40 +0100
                Re: Guide(s?) to backup philosophies David Christensen <dpchrist@holgerdanske.com> - 2017-03-23 20:10 +0100
        Re: should I firewall an open port which isn't used? (was ... Re: Guide(s?) to backup philosophies) Dominik George <nik@naturalnet.de> - 2017-03-31 14:10 +0200
          Re: should I firewall an open port which isn't used? (was ... Re:  Guide(s?) to backup philosophies) Dominik George <nik@naturalnet.de> - 2017-03-31 23:20 +0200
          Re: should I firewall an open port which isn't used? (was ... Re:  Guide(s?) to backup philosophies) Nathan Dorfman <ndorf@rtfm.net> - 2017-04-01 11:00 +0200
        should I firewall an open port which isn't used? (was ... Re:  Guide(s?) to backup philosophies) cbannister@slingshot.co.nz - 2017-03-31 14:10 +0200
          Re: should I firewall an open port which isn't used? (was ... Re:  Guide(s?) to backup philosophies) <tomas@tuxteam.de> - 2017-03-31 14:20 +0200
            Re: should I firewall an open port which isn't used? (was ... Re:  Guide(s?) to backup philosophies) Brian <ad44@cityscape.co.uk> - 2017-03-31 15:20 +0200
              Re: should I firewall an open port which isn't used? (was ... Re:  Guide(s?) to backup philosophies) <tomas@tuxteam.de> - 2017-03-31 15:30 +0200
              Re: should I firewall an open port which isn't used? (was ... Re: Guide(s?) to backup philosophies) Dominik George <nik@naturalnet.de> - 2017-03-31 15:30 +0200
                Re: should I firewall an open port which isn't used? (was ... Re: Guide(s?) to backup philosophies) Dominik George <nik@naturalnet.de> - 2017-03-31 15:50 +0200
      Re: Guide(s?) to backup philosophies Glenn English <ghe2001@gmail.com> - 2017-03-14 19:00 +0100
        Re: Guide(s?) to backup philosophies Dan Ritter <dsr@randomstring.org> - 2017-03-14 19:20 +0100
          Re: Guide(s?) to backup philosophies Miles Fidelman <mfidelman@meetinghouse.net> - 2017-03-14 20:20 +0100
            Re: Guide(s?) to backup philosophies Dan Ritter <dsr@randomstring.org> - 2017-03-14 21:40 +0100
              Re: Guide(s?) to backup philosophies Stefan Monnier <monnier@iro.umontreal.ca> - 2017-03-15 13:30 +0100
                Re: Guide(s?) to backup philosophies Dan Ritter <dsr@randomstring.org> - 2017-03-15 14:10 +0100
                Re: Guide(s?) to backup philosophies "Martin McCormick" <martin.m@suddenlink.net> - 2017-03-15 14:30 +0100
                Re: Guide(s?) to backup philosophies Jonathan Dowland <jmtd@debian.org> - 2017-03-15 16:40 +0100
                Re: Guide(s?) to backup philosophies Jonathan Dowland <jmtd@debian.org> - 2017-03-15 16:40 +0100
                Re: Guide(s?) to backup philosophies Stefan Monnier <monnier@iro.umontreal.ca> - 2017-03-15 21:50 +0100
                Re: Guide(s?) to backup philosophies songbird <songbird@anthive.com> - 2017-03-16 23:50 +0100
        Re: Guide(s?) to backup philosophies Miles Fidelman <mfidelman@meetinghouse.net> - 2017-03-14 20:10 +0100
  Re: Guide(s?) to backup philosophies Joe <joe@jretrading.com> - 2017-03-11 23:30 +0100
    Re: Guide(s?) to backup philosophies Jonathan Dowland <jmtd@debian.org> - 2017-03-15 13:30 +0100
  Re: Guide(s?) to backup philosophies Dan Ritter <dsr@randomstring.org> - 2017-03-13 15:20 +0100
    Re: Guide(s?) to backup philosophies David Christensen <dpchrist@holgerdanske.com> - 2017-03-14 05:10 +0100
    Re: Guide(s?) to backup philosophies Richard Owlett <rowlett@cloud85.net> - 2017-03-14 15:50 +0100
  Re: Guide(s?) to backup philosophies Merlin Büge <toni@bluenox07.de> - 2017-03-14 19:50 +0100
  Re: Guide(s?) to backup philosophies DdB <debianlist@potentially-spam.de-bruyn.de> - 2017-03-19 11:40 +0100

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