Re: Firewall on server itself

From: Mitchell Rowton (mitchell_at_attackprevention.com)
Date: 06/26/03

  • Next message: Potter, Tim: "Simple Wireless Question" 
    Date: Thu, 26 Jun 2003 10:28:40 -0600
To: Ansgar Wiechers <bugtraq@planetcobalt.net>, security-basics@securityfocus.com

    I agree that any device that has more stringent access requirements
    should be placed in an environment that will allow more granular
    control of the authorization. (=put server in DMZ)

    However adding iptables would be consistent with industry practices
    Defense In Depth
    Enclave Boundary Defense (not just perimeter defense)
    M&M Security (hard on outside, soft and squishy on inside)

    Perhaps the iptables could defend against an intruder who is already
    through the firewall because of many reasons:

    Insider threat

    Firewall vender specific vulnerabilities

    Maybe you could just make device specific rules more restrictive that
    the firewall that covers ever device.

    I’m sure there are other good reasons but in general any important
    device should have its own access controls (in my opinion)

    Mitchell

    > On 2003-06-25 Anish Basu wrote:
    > > I am trying to set up a secure web server which will already be
    > > protected by a dedicated harware firewall. The hardware firewall
    will
    > > be configured to protect the web server as well other computers on
    the
    > > network. The web server will be running Red Hat 9.0. Is there any
    > > reason to install and configure firewall software such as IPTables
    on
    > > the web server itself?
    >
    > I don't think that would make sense. If an intruder could exploit the
    > web server to gain root privileges, why would he stop from changing
    the
    > iptables rules? If you don't trust your firewall, throw it away and
    get
    > some other.
    > IMO it would make more sense to move the web server into a DMZ
    instead.
    >
    > > Are there any advantaqes or disadvantages to having two firewalls
    set
    > > up this way?
    >
    > You will have to maintain two rulesets, which will make your firewall
    > more complex and therefore more susceptible to security breaches.
    IMHO.
    >
    > Regards
    > Ansgar Wiechers
    >
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  • Next message: Potter, Tim: "Simple Wireless Question"

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