RE: Last Word On The BlackAttacker.vbs Question
- From: "josephk" <josephk@xxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Tue, 21 Sep 2004 22:31:44 -0700
Of course! However, not that new language you have discussed that was
developed in Seattle.
-----Original Message-----
From: Jim Harrison [mailto:jim@xxxxxxxxxxxx]
Sent: Tuesday, September 21, 2004 10:40 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Last Word On The BlackAttacker.vbs Question
http://www.ISAserver.org
nah; practicing to be a cunnilinguist...
:-)
Jim Harrison
MCP(NT4, W2K), A+, Network+, PCG
http://isaserver.org/Jim_Harrison/
http://isatools.org
Read the help / books / articles!
On Tue, 21 Sep 2004 21:56:45 -0700
"josephk" <josephk@xxxxxxxxx> wrote:
http://www.ISAserver.org
Is this equivalent to, what is 5Q + 5Q?
-----Original Message-----
From: Jim Harrison [mailto:jim@xxxxxxxxxxxx]
Sent: Tuesday, September 21, 2004 6:35 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Last Word On The BlackAttacker.vbs Question
http://www.ISAserver.org
T'anxQ, Joe!
Unfortunately, there is at least one humanoid-like-substance that will
try to argue the point (Tom knows the invisi-badge-wearing
conference lurker with delusions of adequacy).
Jim Harrison
MCP(NT4, W2K), A+, Network+, PCG
http://isaserver.org/Jim_Harrison/
http://isatools.org
Read the help / books / articles!
----- Original Message -----
From: "josephk" <josephk@xxxxxxxxx>
To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
Sent: Tuesday, September 21, 2004 18:29
Subject: [isalist] RE: Last Word On The BlackAttacker.vbs Question
http://www.ISAserver.org
Hi Jim,
Good stuff.
Joseph
-----Original Message-----
From: Jim Harrison [mailto:jim@xxxxxxxxxxxx]
Sent: Tuesday, September 21, 2004 4:56 PM
To: [ISAserver.org Discussion List]
Cc: [ISAserver.org Discussion List]
Subject: [isalist] Last Word On The BlackAttacker.vbs Question
http://www.ISAserver.org
(if you want me to see your reply from sbs2k@xxxxxxxxx, please 'r' me)
Hi all,
It's come to my attention that the once-proud BlockAttacker script is
once again the subject of deep discussion. This script has been pulled
from isatools.org (it never was on isaserver.org) and it will not
reappear on that site so long as I own / run it. It is no longer
supported by me, Microsoft or anyone cooperatively associated with
either one of us.
This subject (and related script) has been abused, misused and
misunderstood for far too long. It stops here and now.
Contrary to what you might have heard, this script was never intended
for anything more than an example of how to use environment variables in
ISA 2000 alert actions. As with any good deed, it has not gone
unpunished.
If you are using it for automatic "deny" policy creation, consider this:
1 - with the notable exception of SMTP Filter alerts (you're not using
it there, are you? That would be silly in the extreme...), if ISA
generated an alert based on the traffic from the remote host, that
traffic was also blocked. Adding a rule to block traffic that is
already silently dropped is a waste of processor time (redundantly
repetitive).
2 - Every time this script creates a new packet filter for a presumed
"attack on your property":
a - it takes CPU time to create, update and save the changes; if
your script is creating rules as fast as someone can DoS your ISA with
spoofed packets, then your firewall quickly becomes a network brick.
b - you complicate the ISA policy set. Every rule in the ISA engine
takes processing time. The fewer rules you have, the faster your ISA
can process the traffic
IOW, leave this monkey-script in place long enough and your ISA will
crawl to a halt.
3 - ISA can generate "attack" alerts on any number of packets that ISA
deems to be "out of context". Most notably, these include (but are not
limited to):
1 - "late" packets; these are response packets arriving from a
server outside of the time ISA considers traffic from this host to be
"valid".
You'll usually see these when internal clients drop their
session before the server finishes the response stream.
99% of the time, ISA will report these as "scans" and drop them
2 - DHCP traffic from your ISP; even if you use static IPs, it's
very likely that someone in your broadcast subnet uses dynamic IPs.
Will your ISA see these? You betcha.
Will it trigger on them? Maybe; it depends on your
configuration and how many alerts you've enabled.
3 - Real attacks using spoofed source IPs; here's the real danger.
All it takes is one script-kiddie to slam your ISA with spoofed
packets from the entire IP v4 space and your ISA will no longer be
functional in the Internet. If you think this is hard to do, you're
fooling yourself.
4 - There has been some discussion regarding:
a - the value of blocking traffic from 127.0.0.1 and how your
ISA will lie bleeding to death on the floor from the "circle of death"
resulting from such an attack. The fact is, while ISA is properly
configured in Firewall or Integrated mode, this "attack" profile a
non-issue. ISA 2000 in Cache mode has no such self-protection, so you
should use a properly-configured packet-filtering router.
b - the potential for blocking traffic from your own ISA server
is less than zero. Any traffic seen at the external interface with a
source IP of 127.0.0.1 is a spoof packet, period. End
of discussion. You should get mad at your ISP for allowing
this to reach you, not some "think for me" script for not having a
"whitelist".
As always, I'm interested in feedback, but here is the final word:
"BlockAttacker.vbs is not a supported tool for any Microsoft product in
this, or any other lifetime in which I may be a member."
Anyone who wants to offer intelligent discussion on the subject will be
heard, and maybe even responded to in kind (of). Anyone who wants to cry
"foul" (no; wait, that's "spooooon!") will be courteously (or not)
ignored.
Jim Harrison
MCP(NT4, W2K), A+, Network+, PCG
http://isaserver.org/Jim_Harrison/
http://isatools.org
Read the help / books / articles!
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