Facebook vulnerability could have let websites obtain users' interests

Facebook vulnerability could have let websites obtain users' interests

Facebook says it has fixed a privacy bug that allowed websites to read likes and interests on users' profiles without them knowing about it.

He realized that just by looking for an iframe inside the search results page, he could just easily determine if a search query has returned a positive or negative result.

Facebook fixed the issue in May and there's no indication that the flaw was successfully exploited by hackers.

Masas told ZDNet that an attacker could use a technique called "tab under" to force the opening of the Facebook Search page inside a background tab, which keeps the user's focus on the main malicious page -which could be disguised as an online game, movie streaming portal, or news article.

Ankush Johar, Director at Infosec Ventures explained, "Although CSRF flaws have a big prerequisite to work that the user must be logged in to the website while he/she visits the infected page, what makes the Facebook vulnerability risky is, unlike other websites, most of the users are always logged into Facebook in their browsers thus putting everyone at massive risks".

Facebook is not the only company which has faced this type of issue and it seems no one took advantage of this particular vulnerability. Notably, because these searches would appear to be conducted by the user, whose login and browser had been authenticated by Facebook, search results wouldn't be affected by the user's privacy settings.

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This is the latest revelation in Facebook's bug-filled year. This could also be used to search for a user's post with certain keywords among other complex tasks, all of which are usually visible to only those who are in the friend list of the user. The bug allowed websites to obtain private information about Facebook users and their friends through unauthorized access to a company API, playing off a specific behavior in the Chrome browser.

A video demonstrating how the hack works shows a pop-up window where the attackers type in the questions.

These search queries, even if they didn't expose fine-grained details, they did expose second-hand information that could reveal, when pieced together, the identity of a user and his friends circle.

"We appreciate this researcher's report to our bug bounty program".

The company awarded Imperva $8,000 in two separate bug bounty rewards.

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