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Arrow  Topic :

Advanced Guestbook 2.4 for phpBB - Multiple XSS and SQL-Injection Vulnerabilities


Arrow  SecurityAlert : 2323
Arrow  CVE : CVE-2006-7077
Arrow  CVE : CVE-2006-7076
Arrow  SecurityRisk : Medium  Security Risk Medium  (About)
Arrow  Remote Exploit : Yes
Arrow  Local Exploit : No
Arrow  Exploit Available : Yes
Arrow  Credit : David Vieira-Kurz
Arrow  Published : 06.03.2007

Arrow  Affected Software : Advanced Guestbook for phpBB 2.4



Arrow  Advisory Content :  

[MajorSecurity #25] Advanced Guestbook 2.4 for phpBB - Multiple XSS and
SQL-Injection Vulnerabilities
---------------------------------------------------------------------------
-------------

Software: Advanced Guestbook for phpBB

Version: 2.4

Type: Cross site scripting + SQL Injection

Made public: July, 22th 2006

Author: Dreamy and Kooky

Page: http://www.phpbbhacks.com/viewhack.php?id=966

Credits:
----------------------------------------------
Discovered by: David Vieira-Kurz
http://www.majorsecurity.de

Original Advisory:
----------------------------------------------
http://www.majorsecurity.de/advisory/major_rls25.txt

Affected Products:
----------------------------------------------
Advanced Guestbook for phpBB 2.4

Description:
----------------------------------------------
Advanced Guestbook is a PHP-based guestbook script.
It includes many useful features such as preview, templates, e-mail
notification, picture upload, page spanning ,
html tags handling, smilies, advanced guestbook codes and language support.

The admin script lets you modify, view, and delete messages. Requires PHP4
and MySQL.

Requirements:
----------------------------------------------
register_globals = On

Vulnerabilities:
----------------------------------------------
XSS:
Input passed directly to the "entry" parameter in "guestbook.php" is not
properly sanitised before being returned to the user.
This can be exploited to execute arbitrary HTML and script code in a user's
browser session in context of an affected site.
It works with a script code like this:

<span class="quotelev1">>"><script%20%0a%0d>alert(123456789)%3B</script>
</span>
SQL Injection:
Input passed directly to the "entry" parameter in "guestbook.php" is not
properly sanitised before being used in a SQL query.
This can be exploited to manipulate SQL queries by injecting arbitrary SQL
code.

Solution:
----------------------------------------------
Edit the source code to ensure that input is properly sanitised.
You should work with "htmlspecialchars()" or "htmlentities()" php-function
to ensure that html tags
are not going to be executed. You should also work with the "intval()"
php-function to ensure that the input
is numeric.

Example:
<?php
$pass = htmlentities($_POST['pass']);
echo htmlspecialchars("<script");
$id = intval($_POST['id']);
?>

Set "register_globals" to "Off".





Arrow  Feedback :

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