RE: Best approach to eradicate attacks?
- From: "William Robertson" <william.robertson@xxxxxxxxxx>
- To: "'[ISAserver.org Discussion List]'" <isalist@xxxxxxxxxxxxx>
- Date: Sat, 23 Jul 2005 23:26:04 +0200
Thanks for the reply Jim.
I agree with you in that I would rather hear ISA complain about, than not,
because that implies it was blocked successfully.
I just don't know to what extent I should worry myself with reporting these
guys... seems like one can never stay ahead. I recall a script a while ago
(possibly from your site?), that could automatically create a packet filer
rule for "naughty" IP addresses. Do you think this is the only other way to
go?
Also, do I understand correctly that if I have opened a port (e.g. TCP21),
and only allowed 1 specific external IP address to connect via it, in theory
an attacker could start spoofing a range of IP's and with any luck he could
hit the jackpot and start talking directly to my server???
-----Original Message-----
From: Jim Harrison [mailto:Jim@xxxxxxxxxxxx]
Sent: 23 July 2005 11:18 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Best approach to eradicate attacks?
http://www.ISAserver.org
Hi Bill,
It really is this simple - if ISA warned you, it blocked it.
If you want to have a bit if fun, you can track him to the ISP and
report him to (usually) abuse@<isp.com>.
Remember to include your log entries that show him scanning you.
-------------------------------------------------------
Jim Harrison
MCP(NT4, W2K), A+, Network+, PCG
http://isaserver.org/Jim_Harrison/
http://isatools.org
Read the help / books / articles!
-------------------------------------------------------
-----Original Message-----
From: William Robertson [mailto:william.robertson@xxxxxxxxxx]
Sent: Saturday, July 23, 2005 12:48
To: [ISAserver.org Discussion List]
Subject: [isalist] Best approach to eradicate attacks?
http://www.ISAserver.org
I know the subject sounds a bit dubious... but I thought I'd ask some
opinion here...
When getting thousands of these alerts:
ISA Server name: <FIREWALL>
ISA Server detected an all port scan attack from Internet Protocol (IP)
address 130.239.18.137.
I know that this little w@nk3r from Amsterdam is trying to attack me on
TCP
21, because I have a Server Publishing rule allowing only 1 specific IP
address in on TCP21.
Question is, am I really safe against this guy? Surely if he knows I've
got
TCP21 open, he can just spoof enough TCP/IP Source Headers until he
guesses
the correct one and my firewall lets him in??
Is there anything else I should be doing in order to secure myself?
Thanks
William R.
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