From: pokleyzz (pokleyzzscan-associates.net)
Date: Wed May 28 2003 - 22:52:54 CDT

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Products: Webfroot Shoutbox v 2.32 and below (http://shoutbox.sf.net)
Date: 09 May 2003
Author: pokleyzz <pokleyzz_at_scan-associates.net>
Contributors: sk_at_scan-associates.net
                shaharil_at_scan-associates.net
                munir_at_scan-associates.net
URL: http://www.scan-associates.net

Summary: Webfroot Shoutbox 2.32 and below directory traversal and code injection.

Description
===========
Webfroot Shoutbox is PHP script released under the GPL. Also known as a tagboard
or a blabbox, shoutboxes allow visitors to your website to leave messages to
other visitors quickly and easily.

Details
=======
User can view any readable file on system where webfroot shoutbox is running using
$conf variable.

i) Shoutbox v2.32

shoutbox.php line 43
-------------------------------------------------------------------
if (!isset($conf)) {
   $conf="shoutboxconf.php";
} else {
   # michel v was there
   $conf = str_replace(':', '', $conf); // hi cross-site scripting, bye cross-site scripting
   $conf = str_replace('%3a', '', $conf); // hi cross-site scripting, bye cross-site scripting
}

require_once ($conf);
-------------------------------------------------------------------

ii) Shoutbox v2.31

shoutbox.php line 43
-------------------------------------------------------------------
if (!isset($conf)) {
   $conf="shoutboxconf.php";
}

require_once ($conf);
--------------------------------------------------------------------

Proof of concept
================

a) View any readable file
        http://blablabla.com/shoutbox.php?conf=../../../../../../../etc/passwd

b) Remote command execution
        i) for version 2.31 user can remotely include file.
        ii) version 2.32 user can use apache access_log to include php code
                [see attachment]
    

Workaround
==========
Append to line 48 of shoutbox.php
        $conf = str_replace('./', '', $conf); // to avoid directory traversal

Tips
====
Search for ":: Shoutbox" at www.google.com can easily identify vulnerable site (129,000 result)

• application/x-perl attachment: jeritan_batinku.pl

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