|Georgi Guninski security advisory #26, 2000
IIS 5.0 cross site scripting vulnerability - using .htw
IIS 5.0/Windows 2000. Exploited with browser (IE,NC) but the problem
is in the web server.
Date: 28 October 2000
This Advisory is Copyright (c) 2000 Georgi Guninski. You may distribute
it unmodified. You may not modify it and distribute it or distribute parts
of it without the author's written permission.
The opinions expressed in this advisory and program are my own and
not of any company.
The usual standard disclaimer applies, especially the fact that Georgi
is not liable for any damages caused by direct or indirect use
of the information or functionality provided by this advisory or program.
Georgi Guninski, bears no responsibility for content or misuse of this
advisory or program or any derivatives thereof.
Using specially designed URLs, IIS 5.0 may return user specified content
to the browser.
enabled and the problem is greater in IE.
By clicking on links, just visiting hostile web pages or opening HTML
email the target IIS sever may return user defined malicous active content.
This is a bug in IIS 5.0, but it affects end users and is exploited
with a browser.
A typical exploit scenario is stealing cookies which may contain sensitive
The following URL:
by a (malicous) user.
The URL may be used in a link or a script.
If /default.htm does not exist another document must be specified.
Remove the .htw extension from application mappings.
Microsoft was notified on 24 October.