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Re: Buffer overflow prevention
From: Jedi/Sector One <j () pureftpd org>
Date: Thu, 14 Aug 2003 22:15:03 +0200

On Thu, Aug 14, 2003 at 10:17:29PM +0300, Timo Sirainen wrote:
AFAIK all those combined do bring real security against generic exploits.

  "Real security" is not the word.
  PaX / Propolice / W^X / non-exec stacks don't solve bugs. What they do is
to _abort_ execution of a process when it behaves abnormally.

  So instead of giving attackers the opportunity to run arbitrary code, you
only give them the ability to cause a denial of service.

  This kind of protection should be coupled with tools that automatically
restart daemons when they crash (ex: daemontools and monit) to actually keep
the service running when under attack. Still, all of this is a couple of
unreliable band-aids.

 __  /*-      Frank DENIS (Jedi/Sector One) <j () 42-Networks Com>     -*\  __
 \ '/    <a href="http://www.PureFTPd.Org/";> Secure FTP Server </a>    \' /
  \/  <a href="http://www.Jedi.Claranet.Fr/";> Misc. free software </a>  \/

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