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Showing posts from December, 2015

[Responsible disclosure] How I could have removed all your Facebook notes

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Note: This is being published with the permission of Facebook under the responsible disclosure policy. The vulnerability is now fixed.Summary:This blog post is about an Insecure direct object reference vulnerability in Facebook Notes using which attacker could have removed all your notes just by replacing his Note id with yours in note editing request. 


About Facebook Notes:Facebook Notes are ways of writing entries about your life, your thoughts, or your all-time favorite songs and then sharing them with your Facebook friends. The beauty of Notes lies in the ability to blog without needing to distribute a web address to friends so that they can go check out your blog. Instead, your friends are connected to your Profile. Therefore, when you publish a Note, it appears in your News Feed.


Vulnerability description: Insecure Direct Object References occur when an application provides direct access to objects based on user-supplied input. As a result of this vulnerability, attackers can bypa…