[UNIX] Ben's Guestbook Cross Site Scripting Vulnerability

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To: list@securiteam.com
Date: 9 Dec 2003 16:25:14 +0200

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  Ben's Guestbook Cross Site Scripting Vulnerability
------------------------------------------------------------------------

SUMMARY

 <http://bjbarnett.t35.com/guestbook.php> Ben's guestbook is "a simple
guestbook that allows your visitors to leave the persons name, email, and
comments that they would like to add. This guestbook does not use MySQL so
it will work if you don't have MySQL". A vulnerability in the product
allows remote attackers to inject HTML and/or JavaScript into pages showed
to arbitrary users.

DETAILS

Vulnerable systems:
 * Ben's Guestbook version 1.0

The first version of this PHP guestbook, suffers from a cross site
scripting vulnerability, which can be resolved by filtering the "comments"
field.

Vendor status:
The vendor has been contact, no news of a patch as of now.

ADDITIONAL INFORMATION

The information has been provided by <mailto:iamroot@systemsecure.org>
David S. Ferreira.

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