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URL Scan on OWA

Re: URL Scan on OWA

Karl Levinson [x y] mvp
7/31/2003 10:43:09 AM

iis security: For any URLScan problem, generally you view the URLScan.log file and then
edit the URLSCAN.ini file and restart IIS. It's a good idea to repeat this
every so often, especially after first installing URLScan, to see if
legitimate requests are being blocked accidentally. See here for more info:

http://securityadmin.info/faq.htm#urlscan

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URL Scan on OWA

Björn Johansson
7/31/2003 11:28:41 AM

Hello,

I've set up a OWA (front end) on our DMZ. The recommended template for OWA
is used on URLScan.

The problem is that it blocks URLs containing "&" and ".." signs. This is
very disturbing for our users because many emails contains .. and "&" and
".." signs in subject line.
Is there any workaround or tools to solve this problem without comprimising
security?

According to last months logs there are no attempted attacks using "&" and
".." in URLs, just our users trying to access email containing the blocked
sequences.

Thanks in advance!

/B.

RE: URL Scan on OWA

lcozzens NO[at]SPAM online.microsoft.com
7/31/2003 10:02:04 PM

Sure thing. Here's what you need to do:

1. Open C:\WINNT\system32\inetsrv\urlscan\urlscan.ini in Notepad
2. Locate the section called [DenyUrlSequences]. In the default
urlscan.ini, this is at the very bottom of the file.
3. Locate the line containing .. and place a semicolon (;) in front of it.
This comments it out.
4. Repeat step #3 for the line containing &, along with any other symbols
you want to allow in OWA subject lines (% would be another candidate...)
5. Save the urlscan.ini file and restart IIS.

For more information on fine-tuning URLScan:
326444 HOW TO: Configure the URLScan Tool
http://support.microsoft.com/?id=326444

This article explains all the options in the urlscan.ini file in detail.

Hope this helps,
Lisa

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Re: URL Scan on OWA

{evin
8/1/2003 2:57:04 AM

On Thu, 31 Jul 2003 10:43:09 -0400, "Karl Levinson [x y] mvp"
[quoted text, click to view]

I agree with Karl, this drove me nuts for quite some time.. I still
get requests blocked occasionally (with an 'this item may have been
deleted' error). The best you can do is watch the log and alter the
ini file so that you have a balance between functionality and
security.

When are we going to see a URLScan that will allow different configs
for different sites on the same server? Now THAT would be cool.

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