bugtraq - Multiple Security Issues Found In AZBB

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Date: Tue, 19 Apr 2005 21:28:22 -0500
From: "GulfTech Security Research" <security@...ftech.org>
To: <bugtraq@...urityfocus.com>, "OSVDB" <moderators@...db.org>,
	"Secunia Research" <vuln@...unia.com>
Subject: Multiple Security Issues Found In AZBB

##########################################################
# GulfTech Security Research		 April 19th, 2005
##########################################################
# Vendor  : AZBB
# URL     : http://azbb.cyaccess.com/
# Version : AZBB 1.0.07d && Earlier
# Risk    : Multiple Vulnerabilities
##########################################################

Description:
azbb is a forum that was written with a primary focus on 
security. azbb does not require a database such as MySQL, 
PostGres or MSSQL and can even be used as a blog, or portal of 
sorts. Unfortunately there are a number of security issues in AZBB 
versions prior to 1.0.08, but none of these issues are considered 
"high risk". However, the developer has addressed these issues and 
all users should upgrade to the current 1.0.08 version.

File Inclusion:
There is a file inclusion vulnerability in AZBB 1.0.07a - 1.0.07c
that is the result of missing code that is present in all of the 
other AZBB versions. This file inclusion issue poses a different 
risk level depending on your server configuration. Lets have a 
look at the code in question. @ /azbb_center/source/main_index.php

########## Get the Abstraction Layer
$inc = $dir_src.'/'.$abs_layer.'_db_ops.php';
file_exists($inc) ? include($inc) : exit('Unable to open '.$inc);

Since the "AZBB KEY CHECK" that exists in other pages is missing 
from this page we can influence both the $dir_src and $abs_layer 
variables if  register globals is on. However, what we can do with 
this greatly depends on the server configuration, and this is a 
result of the file_exists() function being used. You can read 
more about this in the official php manual located here 
http://us2.php.net/file_exists

Arbitrary File Deletion:
There is an issue in AZBB that could allow for an attacker logged 
in as an admin, or a malicious admin to delete arbitrary files 
outside the scope of the application. The vulnerable code is in 
admin_avatar.php and admin_attachment.php Lets have a look at the 
code in admin_avatar.php

## trim all and delete
foreach ($_POST['avat_select'] as $ent)
{ 
	if (file_exists($dir_avatar.'/'.$ent))
	{ unlink($dir_avatar.'/'.$ent); }
}

As we can see there are no checks made for traversal sequences, 
and a user with admin privileges could easily delete arbitrary files 
on the server. The vulnerability in admin_attachment.php is nearly 
identical.

Arbitrary File Enumeration:
There is an issue in AZBB that can be exploited by both users and 
guests alike to tell whether or not files on the target server exists. 
This is due to a file check coming before the input is cleaned in 
attachment.php

elseif (!file_exists($dir_att.'/'.$_POST['attachment'])) {$error =
$txt_err[13];}

This issue can not be used to download arbitrary files, because the 
input is cleaned before the file is included, but we can enumerate 
files. To check if a file exists on the target web server all an 
attacker has to do is modify the "attachment" parameter to include 
traversal sequences. If the file exists we will be prompted with a 
download, and if it doesn't exists we will see an error message.

Solution:
The developer of AZBB was very quick to respond and has addressed 
these issues. A complete change log can be seen by following the 
url posted below. Also, you will find the link to the updated AZBB 
1.0.08 downloads below

http://azbb.cyaccess.com/azbb.php?1091778548
http://azbb.cyaccess.com/azbb.php?1091872271

All users are advised to upgrade their azbb installations as soon 
as possible. A special thanks to AZ for remedying these issues so 
quickly. If everyone responded in this timely of a manner it would 
make what we do a lot easier :)

Related Info:
The original advisory can be found at the following location
http://www.gulftech.org/?node=research&article_id=00068-04192005

Credits:
James Bercegay of the GulfTech Security Research Team

-- 
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Version: 7.0.308 / Virus Database: 266.9.17 - Release Date: 4/19/2005