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Subject: IIS 5.0 cross site scripting vulnerability - using .shtml files or /_vti_bin/shtml.dll
From: Georgi Guninski (joroNAT.BG)
Date: Mon Aug 21 2000 - 08:17:10 CDT
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Georgi Guninski security advisory #19, 2000
IIS 5.0 cross site scripting vulnerability - using .shtml files or
This advisory describes two vulnerabilites (one is already fixed by
Microsoft) but I decided to put them together.
IIS 5.0/Windows 2000. Exploited with browser (IE,NC) but the problem is
in the web server.
For the /_vti_bin/shtml.dll vulnerability FrontPage server extensions
must be installed, but FrontPage Service Release 1.2 fixes the bug.
Probably other versions OSes - not tested.
Date: 21 August 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 program.
Georgi Guninski, bears NO responsibility for content or misuse of this
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 or just visiting hostile web pages 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
1) .shtml files - specially designed urls involving .shtml files may
return hostile content
2) /_vti_bin/shtml.dll - specially designed urls may return hostile
content (this issue is already fixed by Microsoft)
Both issues takes advantage of an unescaped error message return by IIS
or FrontPage Extensions.
The following URL: