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Microsoft Windows Resource Kit Buffer Overflow and Input Validation Holes in 'w3who.dll' May Permit Remote Code Execution and Cross-Site Scripting Attacks
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SecurityTracker Alert ID: 1012435
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SecurityTracker URL: http://securitytracker.com/id?1012435
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CVE Reference: CAN-2004-1133
, CAN-2004-1134
(Links to External Site)
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Date: Dec 7 2004
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Impact: Disclosure of authentication information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information, User access via network
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Exploit Included: Yes
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Description: Several vulnerabilities were reported in the 'w3who.dll' Microsoft ISAPI extension in the Windows 2000/XP Resource Kit. A remote user can execute arbitrary code on the target system. A remote user can conduct cross-site scripting attacks.
Nicolas Gregoire from Exaprobe reported that the software does not properly validate user-supplied input before displaying HTTP headers
or error messages [CVE: CAN-2004-1133]. A remote user can create a specially crafted URL that, when loaded by a target user, will
cause arbitrary scripting code to be executed by the target user's browser. The code will originate from the site running the vulnerable
software and will run in the security context of that site. As a result, the code will be able to access the target user's cookies
(including authentication cookies), if any, associated with the site, access data recently submitted by the target user via web
form to the site, or take actions on the site acting as the target user.
A demonstration exploit header is provided:
Connection:
keep-alive<script>alert("Hello")</script>
A demonstration exploit URL is provided:
/scripts/w3who.dll?bogus=<script>alert("Hello")</script>
It
is also reported that there is a buffer overflow in the processing of input parameters [CVE: CAN-2004-1134]. A remote user can
create a specially crafted URL that, when loaded by the target user, will trigger the overflow and potentially execute arbitrary
code. A demonstration exploit URL is provided:
/scripts/w3who.dll?AAAAAAAAA...[519 to 12571]....AAAAAAAAAAAAA
The original
advisory is available at:
http://www.exaprobe.com/labs/advisories/esa-2004-1206.html
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Impact: A remote user can access the target user's cookies (including authentication cookies), if any, associated with the site running the
vulnerable software, access data recently submitted by the target user via web form to the site, or take actions on the site acting
as the target user.
A remote user can create a URL that, when loaded by the target user, will execute arbitrary code on the target
system with the privileges of the target web service.
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Solution: No solution was available at the time of this entry.
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Vendor URL: www.microsoft.com/ (Links to External Site)
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Cause: Boundary error, Input validation error
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Underlying OS: Windows (2000), Windows (XP)
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Reported By: Nicolas Gregoire <ngregoire@exaprobe.com>
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Message History:
None.
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Source Message Contents
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Date: Mon, 06 Dec 2004 12:40:39 +0100
From: Nicolas Gregoire <ngregoire@exaprobe.com>
Subject: [Full-Disclosure] Multiple vulnerabilities in w3who ISAPI DLL
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Exaprobe
www.exaprobe.com
Security Advisory
Advisory Name: Multiple vulnerabilities in w3who
Release Date: 6 December 2004
Application: Microsoft ISAPI extension w3who.dll
Platform: Windows 2000/XP Resource Kit
Severity: Remote code execution
Author: Nicolas Gregoire <ngregoire@exaprobe.com>
Vendor Status: Affected code is no more available
CVE Candidates: CAN-2004-1133 and CAN-2004-1135
Reference: www.exaprobe.com/labs/advisories/esa-2004-1206.html
Overview :
==========
>From the Windows 2000 Resource Kit documentation :
"W3Who is an Internet Server Application Programming Interface
(ISAPI) application dynamic-link library (DLL) that works within
a Web page to display information about the calling context of
the client browser and the configuration of the host server."
Details :
=========
There're two basic XSS vulnerabilities, and an easily exploitable
buffer-overflow.
XSS vulnerability when displaying HTTP headers :
Connection: keep-alive<script>alert("Hello")</script>
XSS vulnerability in error message :
/scripts/w3who.dll?bogus=<script>alert("Hello")</script>
Buffer overflow when called with long parameters :
/scripts/w3who.dll?AAAAAAAAA...[519 to 12571]....AAAAAAAAAAAAA
Vendor Response :
=================
After notification by Exaprobe, Microsoft choosed to remove
the web download of this component and do not have any plans
to issue an updated version.
Recommendation :
================
Restrict access to the DLL.
Do not use it on production servers.
Related code :
==============
Thanks to HD Moore, a Metasploit plugin will be integrated in the
upcoming release of the Metasploit Framework.
A NASL script has been sent to Nessus developpers.
CVE Information :
=================
The Common Vulnerabilities and Exposures (CVE) project has assigned
the following names to these issues. These are candidates for
inclusion in the CVE list (http://cve.mitre.org), which standardizes
names for security problems.
CAN-2004-1133 Cross-site scripting issues in w3who.dll
CAN-2004-1134 Buffer-overflow in w3who.dll
--
Nicolas Gregoire ----- Consultant en Sécurité des Systèmes d'Information
ngregoire@exaprobe.com ------[ ExaProbe ]------ http://www.exaprobe.com/
PGP KeyID:CA61B44F FingerPrint:1CC647FF1A55664BA2D2AFDACA6A21DACA61B44F
_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.netsys.com/full-disclosure-charter.html
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