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Date:      Wed, 16 Aug 2000 19:13:34 -0500 (CDT)
From:      Mike Silbersack <silby@silby.com>
To:        Kris Kennaway <kris@FreeBSD.org>
Cc:        security@freebsd.org
Subject:   Re: Hilighting dangerous ports
Message-ID:  <Pine.BSF.4.21.0008161902300.14627-100000@achilles.silby.com>
In-Reply-To: <Pine.BSF.4.21.0008161628130.28154-100000@freefall.freebsd.org>

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On Wed, 16 Aug 2000, Kris Kennaway wrote:

> On Wed, 16 Aug 2000, Mike Silbersack wrote:
> 
> > Any way this could be mailed to root as well, or incorporated into that
> > day's security log?  I find when I'm installing ports, I tend to zoom by
> > all the messages.  However, if the info was (in addition) mailed to me,
> > I'd be more likely to pay attention.
> 
> The setuid files will show up in the daily report.

True.  However, that doesn't mean an extra reminder would hurt.  I
personally don't think an extra e-mail every time I install a port with
setuid files would be too annoying.

> More useful than reporting startup scripts would probably be a list of
> current programs which are listening on sockets (from sockstat or
> whatever) - or do you think etc/rc.d changes are also worthwhile?

That sounds useful, but I'd be concerned about bind or other programs
which switch ports every once and a while causing false errors and falsely
alarming people.

And related to that, it seems feasible that once people got used to that,
I could rename my remote UDP shell to bind, and have it hide, pretending
to be one of those false alarms.

So, I'm not sure a simple diff would suffice.  You'd have to be a bit more
clever for bind.  Ftp servers would probably kick off alarms as well, I
suppose.

(I'm not trying to be harsh on the idea, I'm just worried that a
false-prone report would be worse than no report at all.)


Mike "Silby" Silbersack



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