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Date:      Thu, 02 Jul 1998 19:04:48 +0200
From:      Poul-Henning Kamp <phk@critter.freebsd.dk>
To:        rotel@indigo.ie
Cc:        "Allen Smith" <easmith@beatrice.rutgers.edu>, dg@root.com, security@FreeBSD.ORG, njs3@doc.ic.ac.uk, dima@best.net, abc@ralph.ml.org, tqbf@secnet.com
Subject:   Re: bsd securelevel patch question 
Message-ID:  <2755.899399088@critter.freebsd.dk>
In-Reply-To: Your message of "Thu, 02 Jul 1998 16:56:14 -0000." <199807021556.QAA00294@indigo.ie> 

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In message <199807021556.QAA00294@indigo.ie>, Niall Smart writes:
>On Jul 2,  5:35pm, Poul-Henning Kamp wrote:
>} Subject: Re: bsd securelevel patch question
>>
>> >I still agree with you for other reasons though, if an attacker
>> >creates a new service people might use it even though it isn't a
>> >legitimate service setup my the sysadmin.
>> 
>> Right, but if the attacker has hacked your system enough to bind
>> to a socket < 1024, he >OWNS< it.  Any further attempt at adding
>> security is bogus, and can at best OPEN the window more because
>> you will be adding more complexity, rather than subtract from it.
>
>Thats not true, if he hacks the user/group that the web server runs
>at then he only owns the web server, the only additional priviledge
>he gains is the ability to bind to port 80.

which is worse that the standard:  he cannot bind to any port < 1024.

--
Poul-Henning Kamp             FreeBSD coreteam member
phk@FreeBSD.ORG               "Real hackers run -current on their laptop."
"ttyv0" -- What UNIX calls a $20K state-of-the-art, 3D, hi-res color terminal

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