From: Gregory Le Bras | Security Corporation (gregory.lebrassecurity-corp.org)
Date: Sun Mar 02 2003 - 15:32:58 CST

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Security Corporation Security Advisory [SCSA-008]
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PROGRAM: PY-Livredor
HOMEPAGE: http://www.py-scripts.com
                       http://www.scripts-php.com
VULNERABLE VERSIONS: v1.0
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DESCRIPTION
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PY-Livredor is an easy guestbook script using Php4 and MySql with
an administration which allow messages deletion.

DETAILS
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A Cross-Site Scripting vulnerability have been found in PY-Livredor
which allow attackers to inject script codes into the guestbook and use
them on clients browser as if they were provided by the website.

This Cross-Site Scripting vulnerability are found in the page for
posting messages (index.php)

An attacker can input specially crafted links and/or other
malicious scripts.

EXPLOIT
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A vulnerability was discovered in the page for posting messages,
at this adress :

http://[target]/livredor/index.php

The vulnerability is at the level of the interpretation of the "titre",
"Votre pseudo", "Votre e-mail", "Votre message" fields.

Indeed, the insertion of a hostile code script in this field makes it
possible to a malicious user to carry out this script on the navigator
of the visitors.

The hostile code could be :

[script]alert("Cookie="+document.cookie)[/script]

(open a window with the cookie of the visitor.)

(replace [] by <>)

SOLUTIONS
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No solution for the moment.

VENDOR STATUS
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The vendor has reportedly been notified.

LINKS
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http://www.security-corp.org/index.php?ink=4-15-1

Version Française :

http://www.security-corp.org/advisories/SCSA-008-FR.txt

------------------------------------------------------------
Grégory Le Bras aka GaLiaRePt | http://www.Security-Corp.org
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