RE: Am I compromised?
- From: "Jim Harrison" <jim@xxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Tue, 9 Dec 2003 06:29:37 -0800
There is a middle ground.
If DNS is to work properly in your network, each machine needs a domain name
context.
This requires either:
1. a domain association, either as a domain member, or simply entering the
primary domain suffix in the computer naming dialogs
2. a domain suffix search list manually entered in the TCP/IP properties
"DNS" tab
..otherwise, DNS-based name resolution in your network will be flaky at
best.
The way to prevent ISA form using this falling prey to Code Red "www"
requests is to add the "SkipNameResolutionForPublishingRules = 0x1"
and
"SkipNameResolutionForAccessAndRoutingRules = 0x1"
..to HKLM\System\CurrentControlSet\Services\W3Proxy\Parameters.
(requires a web proxy service restart)
This causes ISA to make rule decisions without performing name lookups.
Jim Harrison
MCP(NT4, W2K), A+, Network+, PCG
http://www.microsoft.com/isaserver
http://isaserver.org/Jim_Harrison
http://isatools.org
Read the help, books and articles!
----- Original Message -----
From: "DJG" <intellihome@xxxxxxxxxxx>
To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
Sent: Monday, December 08, 2003 22:33
Subject: [isalist] RE: Am I compromised?
http://www.ISAserver.org
I understand and thank you. When you or Jim (can't remember now which one of
you) answered the thread that the bogus.net was a test setup I thought maybe
there was a new and improved configuration. I had already done the registry
change but when the bogus.net was mentioned in the thread it rang a bell so
I looked it up in my isa docs and found that article. I paste these articles
into word so the text is easily searchable. I originally had set my isa
setup to use the bogus.net but later changed to the registry hack.
Thanks again,
Dan
-----Original Message-----
From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxxxxxxxxx]
Sent: Monday, December 08, 2003 9:57 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Am I compromised?
http://www.ISAserver.org
Hi Dan,
The key is to understand that you don't want to automatically allow the
qualification of unqualfied requests.
For example, the worm sends a request for WWW.
If your machine belongs to the domain, domain.com, the machine will
fully qualify the WWW to www.domain.com. Bingo! You just happened to
create a Web publishing rule for www.domain.com in the destination set.
Now the dreaded worm can access your Web site using an unqualfied
request.
So, just do what the article says. Make the registry entries or include
bogus.com. Since you're not going to send unqualified requests to the
ISA firewall for name resolution, because you've correctly configured
your DNS, LAT and LDT, it won't be an issue except for the scumbags who
try to whack you by sending unqualified requests.
HTH,
Tom
-----Original Message-----
From: DJG [mailto:intellihome@xxxxxxxxxxx]
Sent: Monday, December 08, 2003 12:06 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Am I compromised?
http://www.ISAserver.org
There was (maybe still is) an article on isaserver.org called ISA Server
Checklist Part 1 that stated:
>>
One solution is to select the Append these DNS suffixes (in order)
option, and then enter a bogus domain name (such as bogus.net). Now when
that unqualified request for www hits the external interface of the ISA
Server, it becomes a query for www.bogus.net, which you surely don't
have any entries for in any of your Destination Sets.
<<
It went of to say:
<<
However, the best solution to this problem is to configure the ISA
Server to stop resolving unqualified requests. Make the following
registry changes:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W3Proxy\Parameters\
Skip
NameResolutionForPublishingRules : DWORD : 1
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W3Proxy\Parameters\
Skip
NameResolutionForAccessAndRoutingRules : DWORD : 1 <<
Is this an outdated configuration?
Dan
-----Original Message-----
From: William Robertson [mailto:robertson.william@xxxxxxxxxxxxxx]
Sent: Monday, December 08, 2003 9:24 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Am I compromised?
http://www.ISAserver.org
I apologise in advance if I have made a mistake. I in no way meant to
insinuate that what I believe Tom said was not correct. I may have got
the specifics wrong... sorry.
-----Original Message-----
From: Jim Harrison [mailto:jim@xxxxxxxxxxxx]
Sent: 08 December 2003 17:34 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Am I compromised?
http://www.ISAserver.org
Hmmm...
I'd like to see that one.
Adding bogus entries in there also has the undesirable effect of
randomizing your machine's name resolution.
Jim Harrison
MCP(NT4, W2K), A+, Network+, PCG
http://www.microsoft.com/isaserver
http://isaserver.org/Jim_Harrison
http://isatools.org
Read the help, books and articles!
----- Original Message -----
From: "William Robertson" <robertson.william@xxxxxxxxxxxxxx>
To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
Sent: Sunday, December 07, 2003 21:55
Subject: [isalist] RE: Am I compromised?
http://www.ISAserver.org
I would agree with Tom in that this was entered during a test scenario.
Quite a while ago I believe Tom himself explained that if the "append
these
DNS suffixes" option is empty, then a would be intruder is able to do
something fancy to get into your network or something (not big on the
specifics), and to avoid this Tom's exact recommendation was to include
something like "bogus.net" so as to prevent this from happening.
-----Original Message-----
From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxxxxxxxxx]
Sent: 08 December 2003 02:13 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Am I compromised?
http://www.ISAserver.org
Hi Arthus,
Are you sure you didn't enter that when doing a test?
Otherwise, you need to remove that entry now.
HTH,
Tom
-----Original Message-----
From: Lim, Arthus T. [mailto:alim@xxxxxxxxx]
Sent: Friday, December 05, 2003 12:05 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] Am I compromised?
http://www.ISAserver.org
I was reviewing the settings of my ISA server and found out something
suspicious. I found "bogus.net" written under append these DNS suffixes
(in order) in IP properties. The last thing that I've done is to
install the URLScan. Is the machine compromised? Any of you who
experienced the same thing?
Thank you.
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Stainless does not own and endorse any other content. Views and
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of Columbus Stainless. The person addressed in the e-mail is the sole
authorised recipient. Please notify the sender immediately if it has
unintentionally reached you and do not read, disclose or use the
content in any way. Whilst all reasonable steps are taken to ensure
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