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phpCollab v2.5 CMS - SQL Injection Vulnerability

Document Title:
===============
phpCollab v2.5 CMS - SQL Injection Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1898


Release Date:
=============
2016-08-08


Vulnerability Laboratory ID (VL-ID):
====================================
1898


Common Vulnerability Scoring System:
====================================
6.6


Product & Service Introduction:
===============================
phpCollab is an open source internet-enabled system for use in projects that 
require collaboration over the internet. Those organizations, 
such as consulting firms, that rely on a division between firm-side and 
client-side information will benefit most from use of phpCollab.


Abstract Advisory Information:
==============================
The vulnerability laboratory research team discovered a remote sql-injection 
web vulnerability in the official phpCollab v2.5 content management system.


Vulnerability Disclosure Timeline:
==================================
2016-08-08: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
phpCollab Community
Product: phpCollab - Content Management System 2.5


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


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


Technical Details & Description:
================================
A remote sql-injection web vulnerability has been discovered in the official 
phpCollab v2.5 content management system.
The vulnerability allows remote attackers to execute own malicious sql commands 
to compromise the application or dbms.

The sql-injection vulnerability is located in the `id` parameter of the 
`./phpcollab/users/` module GET method request. 
Remote attackers are able to execute own sql commands by usage of the insecure 
`emailusers.php` file GET method request. 
The attack vector of the vulnerability is application-side and the request 
method to inject is GET The vulnerability 
is a classic select remote sql-injection.

The security risk of the vulnerability is estimated as high with a cvss (common 
vulnerability scoring system) count of 6.6.
Exploitation of the remote sql injection web vulnerability requires no user 
interaction or privileged web-application user account.
Successful exploitation of the remote sql injection results in database 
management system, web-server and web-application compromise.

Request Method(s):
                                [+] GET

Vulnerable Module(s):
                                [+] ./phpcollab/users/

Vulnerable File(s):
                                [+] emailusers.php

Vulnerable Parameter(s):
                                [+] id


Proof of Concept (PoC):
=======================
The remote sql-injection web vulnerability can be exploited by remote attackers 
without privileged web-application user account and without user interaction.
For security demonstration or to reproduce the sql-injection web vulnerability 
follow the provided information and steps below to continue.


PoC: Exploitation
http://phpcollab.localhost:8080/phpcollab/users/emailusers.php?id=1'[SQL-INJECTION
 VULNERABILITY!]&&PHPSESSID=ghtu76jt276nji04lua07930t5


--- Error Exception Logs [SQL] ---
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
-
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 2
-
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 3


--- PoC Session Logs [GET] ---
Status: 200[OK]
GET 
http://phpcollab.localhost:8080/phpcollab/users/emailusers.php?id=1%27&&PHPSESSID=ghtu76jt276nji04lua07930t5
 
Mime Type[text/html]
   Request Header:
      Host[phpcollab.localhost:8080]
      User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:47.0) Gecko/20100101 
Firefox/47.0]
      Cookie[PHPSESSID=ghtu76jt276nji04lua07930t5; 
_pk_id.2.bb5e=7b20cb9175a196a9.1470585617.1.1470586689.1470585617.; 
        
_pk_ref.2.bb5e=%5B%22%22%2C%22%22%2C1470585617%2C%22http%3A%2F%2Fphpcollab.localhost:8080%2Fdemo%2F1%2F394%2FStash%22%5D;
 _pk_ses.2.bb5e=*]
      Connection[keep-alive]
      Cache-Control[max-age=0]
   Response Header:
      Server[nginx/1.2.1]
      Content-Type[text/html]
      Transfer-Encoding[chunked]
      Connection[keep-alive]
      X-Powered-By[PHP/5.5.27-1+deb.sury.org~precise+1]


Reference(s):
http://phpcollab.localhost:8080/
http://phpcollab.localhost:8080/phpcollab/
http://phpcollab.localhost:8080/phpcollab/users/
http://phpcollab.localhost:8080/phpcollab/users/emailusers.php


Solution - Fix & Patch:
=======================
The vulnerability can be patched by usage of a prepared statement in the 
emailusers.php file GET method request.
Disallow special chars and escape the input and outpit context entries to 
prevent further sql-injection attacks.


Security Risk:
==============
The security risk of the remote sql-injection web vulnerability in the id 
parameter of the emailusers.php file is estimated as high. (CVSS 6.6)


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri 
(http://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.)


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