Date: Fri, 19 Dec 2014 13:42:33 +0100
From: Vulnerability Lab <research@...nerability-lab.com>
To: fulldisclosure@...lists.org
Subject: [FD] Facebook BB #18 - IDOR Issue & Privacy Vulnerability

Document Title:
===============
Facebook BB #18 - IDOR Issue & Privacy Vulnerability


References (Source):
====================
http://www.vulnerability-lab.com/get_content.php?id=1371

Facebook Security ID: 219208937


Release Date:
=============
2014-12-12


Vulnerability Laboratory ID (VL-ID):
====================================
1371


Common Vulnerability Scoring System:
====================================
4.7


Product & Service Introduction:
===============================
Facebook is an online social networking service, whose name stems from the colloquial name for the book given to students 
at the start of the academic year by some university administrations in the United States to help students get to know 
each other. It was founded in February 2004 by Mark Zuckerberg with his college roommates and fellow Harvard University 
students Eduardo Saverin, Andrew McCollum, Dustin Moskovitz and Chris Hughes. The website`s membership was initially limited 
by the founders to Harvard students, but was expanded to other colleges in the Boston area, the Ivy League, and Stanford University. 
It gradually added support for students at various other universities before opening to high school students, and eventually to anyone 
aged 13 and over. Facebook now allows any users who declare themselves to be at least 13 years old to become registered users of the site.

Users must register before using the site, after which they may create a personal profile, add other users as friends, and exchange messages, 
including automatic notifications when they update their profile. Additionally, users may join common-interest user groups, organized by workplace, 
school or college, or other characteristics, and categorize their friends into lists such as `People From Work` or `Close Friends`. As of 
September 2012, Facebook has over one billion active users, of which 8.7% are fake. According to a May 2011 Consumer Reports survey, there are 
7.5 million children under 13 with accounts and 5 million under 10, violating the site`s terms of service.

In May 2005, Accel partners invested $12.7 million in Facebook, and Jim Breyer added $1 million of his own money to the pot. A January 2009 
Compete.com study ranked Facebook as the most used social networking service by worldwide monthly active users. Entertainment Weekly included the 
site on its end-of-the-decade `best-of` list, saying, `How on earth did we stalk our exes, remember our co-workers` birthdays, bug our friends, 
and play a rousing game of Scrabulous before Facebook?` Facebook eventually filed for an initial public offering on February 1, 2012, and was 
headquartered in Menlo Park, California. Facebook Inc. began selling stock to the public and trading on the NASDAQ on May 18, 2012. Based on its 
2012 income of USD 5.1 Billion, Facebook joined the Fortune 500 list for the first time, being placed at position of 462 on the list published in 2013.

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


Abstract Advisory Information:
==============================
An independent Vulnerability Laboratory Researcher discovered a persistent input validation web vulnerability in the official Facebook Studio online service web-application.


Vulnerability Disclosure Timeline:
==================================
2014-12-12: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Facebook
Product: Studio Service - Web Application 2014 Q4


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


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


Technical Details & Description:
================================
There is a privacy leakage + IDOR issue in the facebook studio online service web-application that reveals shares with the private(only me) status.

The one I entitled IDOR, was because it was refering to data that was supposed to be removed. before I converted my account to a page, my work
place was The Remus and also Security researcher at Facebook (this one was an `only me` share). 

That was one bug, refering to things that were suppose to be removed. The second is revealing them whatever their privacy setting was configured.

If anyone converted his account to a page, and joins the facebook studio online service web-application. They are exposed to both of these issues. 
Their old workplace(s) that has been added before they converted their account are shown, shown even when the privacy setting is `only me`.


Security Risk:
==============
The security risk of the privacy issue in the facebook studio online service web-application is estimated as medium.


Credits & Authors:
==================
Paulos Yibelo (paulosyibelo.com)


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