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[FD] Stash v1.0.3 CMS - SQL Injection Vulnerability

Document Title:
===============
Stash v1.0.3 CMS - SQL Injection Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1899


Release Date:
=============
2016-08-10


Vulnerability Laboratory ID (VL-ID):
====================================
1899


Common Vulnerability Scoring System:
====================================
6


Product & Service Introduction:
===============================
Stash is a free content management system (CMS). Was written on PHP and uses 
MySQL. Distributed under The Creative Commons License.


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a remote 
sql-injection web vulnerability in the official Stash v1.0.3 content management 
system.


Vulnerability Disclosure Timeline:
==================================
2016-08-10: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Stash
Product: Stash - Content Management System (Web-Application) 1.0.3


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 
`./stash/admin/` module GET method request. 
Remote attackers are able to execute own sql commands by usage of the insecure 
`usersedit.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 6.0.
Exploitation of the remote sql injection vulnerability requires no user 
interaction and a low 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):
                                [+] ./stash/admin/

Vulnerable File(s):
                                [+] usersedit.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://stash.localhost:8000/stash/admin/usersedit.php?id=-1'[SQL-INJECTION 
VULNERABILITY!]--


--- Error Exception Logs [SQL] ---
Query error: 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 
''1''' at line 1


--- PoC Session Logs [GET] ---
Status: 200[OK]
GET http://stash.localhost:8000/stash/admin/usersedit.php?id=-1'[SQL-INJECTION 
VIA ID PARAMETER!]-- 
Mime Type[text/html]
   Request Header:
      Host[stash.localhost:8000]
      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=7b20cb9175a196a9.1470585617.1.1470585963.1470585617.; 
        
_pk_ref.2.bb5e=%5B%22%22%2C%22%22%2C1470585617%2C%22http%3A%2F%2Fstash.localhost:8000%2Fdemo%2F1%2F394%2FStash%22%5D;
 _pk_ses.2.bb5e=*]
      Connection[keep-alive]
   Response Header:
      Server[nginx/1.2.1]
      Date[Sun, 07 Aug 2016 16:06:03 GMT]
      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://stash.localhost:8000/
http://stash.localhost:8000/stash/
http://stash.localhost:8000/stash/admin/
http://stash.localhost:8000/stash/admin/usersedit.php


Solution - Fix & Patch:
=======================
The sql-injection web vulnerability in the application can be patched by usage 
of a prepared statement in the vulnerable usersedit.php file GET method request.
Disallow the usage of special chars and escape the input/output context of the 
module to prevent further sql-injection attacks.


Security Risk:
==============
The security risk of the remote sql-injection web vulnerability in the 
useredit.php file GET method request is estimated as high. (CVSS 6.0)


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


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=========================
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