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GuestBookHost Input Validation Flaws in Several Fields Permit Remote Cross-Site Scripting Attacks
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SecurityTracker Alert ID: 1007045
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CVE Reference: GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Jun 24 2003
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Impact: Disclosure of authentication 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: Julien Lanthea reported several input validation vulnerabilities in GuestBookHost. A remote user can conduct cross-site scripting attacks.
It is reported that the script does not filter HTML code from user-supplied input in the 'Name', 'Email', and 'Message' fields.
A remote user can sign the guest book with specially crafted information so that when a target user views the guest book, arbitrary
scripting code will be executed by the target user's browser. The code will originate from the site running the GuestBookHost 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 content that will redirect the target
user's browser to the attacker's web site is provided:
<script>window.location.replace("http://[attacker]");</script>
The
vendor has reportedly been notified.
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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
GuestBookHost 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.nukedweb.com/phpscripts/guestbookhost.php (Links to External Site)
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Cause: Input validation error
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Underlying OS: Linux (Any), UNIX (Any), Windows (Any)
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Reported By: Julien L. <jlanthea@jlanthea.net>
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Message History:
None.
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Source Message Contents
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Date: Tue, 24 Jun 2003 02:40:36 +0100 (BST)
From: Julien L. <jlanthea@jlanthea.net>
Subject: GuestBookHost : Cross Site Scripting
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
GuestBookHost : Cross Site Scripting
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Program : GuestBookHost
Url vendor : http://www.nukedweb.com/phpscripts/guestbookhost.php
Problem : Multiple Cross Site Scripting Vulnerabilities
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Author : Julien LANTHEA (contact@jlanthea.net)
Www : jlanthea.net
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
DESCRIPTION :
~~~~~~~~~~~~~
GuestBookHost allows you to start your own free guestbook service
for you to offer to other webmasters. Other webmasters can sign
up to your service, get the HTML code for their guestbook, view
the stats, set the colors for their guestbook, and users can log
in later to edit these settings. GuestBookHost also blocks users
from posting multiple times.
PROBLEM :
~~~~~~~~~
When you sign the guestbook, it's possible to include codes into
the 'Name', 'Email' or 'Message' fields. Then when the guestbook
is viewed, the code is executed (client side).
EXPLOIT :
~~~~~~~~~
For example, by including the following javascript code into one
of the 3 fields, the guestbook would be out of service, because when
requested, it would immediatly redirect every clients to 'www.toto.com'.
<script>window.location.replace("http://www.toto.com");</script>
SOLUTION :
~~~~~~~~~~
No solution yet, vendor has been informed by mail.
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ajgpSvmGc8dbbuyqlfpCZn8=
=VvAI
-----END PGP SIGNATURE-----
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