RE: Re[2]: Personal firewalls.

[William DeRieux <williamderieux () gmail com>]

Any self-respecting network administrator, (who knows what he/she is doing),
would have planned for that
And setup some kind of overideing ruleset, that will allways allow
communiction to/from it's own resources.
A.K.A, the "BLACKHOLE / IP BANNING" would be overiden for IP's & resources,
like that of it's DNS Servers.
But, that could, too, be exploited.
If Z spoofs packets using the ip of the DNS Server (the one that is not
banned because of the overide or 'never ban these ips, etc')
Would be allowed to send those packets, SYN Packet, etc, as was stated, ad
infinitum.  

As, they say, no computer or server is ever, *TRULY*, secure - even with a
software or hardware firwall, or 'voodoo-like' security measures.
Digitalchaos
(just my 2 cents)
-----Original Message-----
From: full-disclosure-bounces () lists grok org uk
[mailto:full-disclosure-bounces () lists grok org uk] On Behalf Of Thierry
Zoller
Sent: Friday, January 20, 2006 5:58 PM
To: full-disclosure () lists grok org uk
Subject: Re[2]: [Full-disclosure] Personal firewalls.


Dear Eliah Kagan,

EK> Then Z comes along and sends a
EK> bunch of SYN packets to X, spoofed to have the source IP of Y, waits 
EK> 10 minutes, and repeats ad infinitum.

Z sends spoofed packets coming from the DNS server of X even more
interesting..

-- 
http://secdev.zoller.lu
Thierry Zoller
Fingerprint : 5D84 BFDC CD36 A951 2C45  2E57 28B3 75DD 0AC6 F1C7

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