Home Hacking News Hacker Exploited A Remote Code Execution Bug On Facebook

Hacker Exploited A Remote Code Execution Bug On Facebook

by Unallocated Author

A security researcher named Andrew Leonov has discovered a critical remote code execution bug on Facebook. This allows him to breach the security of the social media giant using ImageMagick flaw which was previously patched in 2016. Andrew was successful in using the bug to carry the attack against the Facebook servers.

In his blog post, Andrew explained that he reported this issue to Facebook back in October 2016 but the ImageMagick bug is still relevant and active in Facebook. Andrew was awarded $40,000 for providing Facebook security team with an in-depth proof of concept (PoC) and they said they have patched it.

AAndrew explained that all of this happened unintentionally when he was searching for a flaw in a different service which then redirected him on Facebook and further analysing it allowed him to discover the remote execution bug.

“Once upon a time on Saturday in October I was testing some big service (not the Facebook) when some redirect followed me on Facebook. It was a “Share on Facebook” dialogue. “I am glad to be the one of those who broke the Facebook,” said Leonov.

You must be noted that the largest payment awarded ever given by Facebook as a part of its bug bounty program was $33,500 to Reginaldo Silva back in 2014, he also reported a similar remote code execution bug. To confirm the payment, The Register has contacted Facebook.

By the time of publishing this article, there was not a single official statement from Facebook or CrowdBug confirming whether Leonov was awarded $40,000. However, this is not the first time when ImageMagick security flaw is in the news for all the wrong reasons. In 2016, a hacker used the same flaw to destroy Fur Affinity Art Gallery website.

You may also like

Latest Hacking News

Privacy Preference Center


The __cfduid cookie is used to identify individual clients behind a shared IP address and apply security settings on a per-client basis.

cookie_notice_accepted and gdpr[allowed_cookies] are used to identify the choices made from the user regarding cookie consent.

For example, if a visitor is in a coffee shop where there may be several infected machines, but the specific visitor's machine is trusted (for example, because they completed a challenge within your Challenge Passage period), the cookie allows Cloudflare to identify that client and not challenge them again. It does not correspond to any user ID in your web application, and does not store any personally identifiable information.

__cfduid, cookie_notice_accepted, gdpr[allowed_cookies]


DoubleClick by Google refers to the DoubleClick Digital Marketing platform which is a separate division within Google. This is Google’s most advanced advertising tools set, which includes five interconnected platform components.

DoubleClick Campaign Manager: the ad-serving platform, called an Ad Server, that delivers ads to your customers and measures all online advertising, even across screens and channels.

DoubleClick Bid Manager – the programmatic bidding platform for bidding on high-quality ad inventory from more than 47 ad marketplaces including Google Display Network.

DoubleClick Ad Exchange: the world’s largest ad marketplace for purchasing display, video, mobile, Search and even Facebook inventory.

DoubleClick Search: is more powerful than AdWords and used for purchasing search ads across Google, Yahoo, and Bing.

DoubleClick Creative Solutions: for designing, delivering and measuring rich media (video) ads, interactive and expandable ads.



The _ga is asssociated with Google Universal Analytics - which is a significant update to Google's more commonly used analytics service. This cookie is used to distinguish unique users by assigning a randomly generated number as a client identifier. It is included in each page request in a site and used to calculate visitor, session and campaign data for the sites analytics reports. By default it is set to expire after 2 years, although this is customisable by website owners.

The _gat global object is used to create and retrieve tracker objects, from which all other methods are invoked. Therefore the methods in this list should be run only off a tracker object created using the _gat global variable. All other methods should be called using the _gaq global object for asynchronous tracking.

_gid works as a user navigates between web pages, they can use the gtag.js tagging library to record information about the page the user has seen (for example, the page's URL) in Google Analytics. The gtag.js tagging library uses HTTP Cookies to "remember" the user's previous interactions with the web pages.

_ga, _gat, _gid