Fortnite vulnerabilities would have allowed attackers to intercept and steal login credentials

Researchers at Check Point today shared details of vulnerabilities that could have affected any player of the hugely popular online battle game, Fortnite.

Fortnite vulnerabilities

Vulnerability impact

If exploited, the vulnerability would have given an attacker full access to a user’s account and their personal information, as well as enabling them to purchase virtual in-game currency using the victim’s payment card details. The vulnerability would also have allowed attackers to listen to and record in-game chat as well as surrounding sounds and conversations within the victim’s home or other location of play.

While Fortnite players had previously been targeted by scams that deceived them into logging into fake websites that promised to generate Fortnite’s ‘V-Buck’ currency, these new vulnerabilities could have been exploited without the player handing over any login details.

Attackers could have potentially gained access to a user’s account through vulnerabilities discovered in Fortnite’s user login process. Due to three flaws found in Epic Games’ web infrastructure, researchers were able to manipulate the token-based authentication process used by Fortnite in conjunction with Single Sign-On (SSO) systems such as Facebook, Google, Xbox and PlayStation to steal the user’s access credentials and take over their account.

How you can fall victim to this attack

To fall victim to this attack, a player needs only to click on a crafted phishing link coming from a genuine Epic Games domain, which makes the link appear legitimate. Once clicked, the user’s Fortnite authentication token could be captured by the attacker without the user entering any login credentials.

According to Check Point’s researchers, the potential vulnerability originated from flaws found in two of Epic Games’ sub-domains online that were susceptible to a malicious redirect, allowing users’ legitimate authentication tokens to be intercepted by a hacker from the compromised sub-domain.

“Fortnite is one of the most popular games played mainly by kids. These flaws provided the ability for a massive invasion of privacy,” said Oded Vanunu, head of products vulnerability research for Check Point. “Together with the vulnerabilities we recently found in the platforms used by drone manufacturer DJI, show how susceptible cloud applications are to attacks and breaches. These platforms are being increasingly targeted by hackers because of the huge amounts of sensitive customer data they hold. Enforcing two-factor authentication could mitigate this account takeover vulnerability.”

Epic Games fixed the vulnerability

Check Point has notified Epic Games of the vulnerability which has now been fixed. Check Point and Epic Games advise all users to remain vigilant whenever exchanging information digitally, and to practice safe cyber habits when engaging with others online. Users should also question the legitimacy of links to information seen on user forums and websites.

What should you do?

Organizations must perform thorough and regular hygiene checks on their IT infrastructure they have not left outdated and unused sites or access points online. In addition, it is good practice to review any outdated website or sub-domains that may still be online though not in use.

In order to minimize the threat of falling victim to an attack that exploits vulnerabilities like this, users should enable two-factor authentication, ensuring that when logging into their account from a new device, the player would need to enter a security code sent to the account holder’s email addresses.

It is also important that parents make their children aware of the threat of online fraud and warn them that cyber criminals will do anything to gain access to personal and financial details which may be held as part of a gamer’s online account.