Facebook Vulnerability Allows to Video-Call Mark Zuckerberg!

Have you ever desired to Video-Call the Founder of Facebook? Well, with this Vulnerability it's still possible!. The following used vulnerability allows with a GET (In-URI) CSRF Parameter to avoid the Video-Calling blocks into Mark Zuckerberg Privacy Setting's. 

.First let me introduce what a CSRF Vulnerability IS:
 "A Cross-Site Request Forgery (CSRF) Vulnerability is a type of attack that occurs when a malicious Web site, email, blog, instant message, or program causes a user?s Web browser to perform an unwanted action on a trusted site for which the user is currently authenticated." (*) 

Now, Let's start analyzing it! First we start from this URL (like we are actually Video-Calling one of our Friends): - 

https://www.facebook.com/videocall/incall/

When we've identified the Vulnerable GET Parameter, we may apply it as below!

https://www.facebook.com/videocall/incall/?peer_id=

After the peer_id= parameter, we'll insert Mark Zuckerberg ID (which is id=4)

So, definitely, the Complete URL, will look like this below:

https://www.facebook.com/videocall/incall/?peer_id=4

Regarding this Bug, Facebook Security Team have not yet released a FIX, on the fact continuing to allow Attackers to use this flaw against the whole Social Community!.

Reference: OWASP CSRF Guide

https://www.owasp.org/index.php/Cross-Site_Request_Forgery_%28CSRF%29_Prevention_Cheat_Sheet

About the Author 
Christian Galeone  is a Cyber Security Researcher from Italy, he's currently studying to ITCL Marco Polo ( Vocational Technical Institute | Vo-Tech ) attending the IT Programming Class. He has been Acknowledged by the TOP 5 Companies including Yahoo!, Microsoft, AT&T, Sony etc. He is currently working with HOC as author of Cyber Security & Critical Tools Research Articles.