Saturday, November 25, 2017

Image removal vulnerability in Facebook polling feature


  3 comments
2:12 PM


Delete any
Image on Facebook





When I was checking out facebook's new features, I noticed that polling feature were added to the posts so I start working on it.

POLL


Whenever a user tries to create a poll, a request containing gif URL or image id will be sent,
poll_question_data[options][][associated_image_id] contains the uploaded image id.




When this field value changes to any other images ID, that image will be shown in poll.
After sending request with another user image ID, a poll containing that image would be created.
Our uploaded image has been replaced by victim's image

At the end when we try to delete the poll, victim's image would be deleted with it by facebook as a poll property.

POC:


I appreciate Facebook security team for resolving this vulnerability quickly.

TimeLine:
3 Nov 2017, 03:16 – Report Sent
3 Nov 2017, 15:25 – Triaged
3 Nov 2017, 16:46 - Temporary fix
5 Nov 2017, 15:03 - Permanent fix
8 Nov 2017   $10,000 Bounty awarded



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Tuesday, May 17, 2016

How I bypassed Facebook CSRF once again!


  7 comments
9:52 AM






I found a vulnerability in Facebook that allowed me to create arbitrary form in Facebook that send a POST request with CSRF token to any Facebook endpoints or external hosts!

It was very similar to this bug which I found in 2015.


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Thursday, April 9, 2015

How I bypassed Facebook CSRF Protection


  37 comments
2:35 AM




bypass facebook csrf 2015



I discovered a critical vulnerability in Facebook that allowed an attacker to bypasses Facebook CSRF protection!

more information about CSRF at owasp

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Sunday, March 15, 2015

Bypass ad account roles vulnerability 2015


  1 comment
2:04 PM


facebook exploit 2015





I discovered a vulnerability in Facebook that allowed a normal user in ad account to get unauthorized admin access in that ad account

admins in ad account  can add any user to their ad account with these 3 type of  role :

  1. admin
  2. advertiser
  3. analyst
read more about these roles link

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