Tinder security flaw granted account access with just a phone number

22 February, 2018, 10:27 | Author: Darnell Taylor
  • Anand Prakash has made a career out of exposing security bugs

Using this vulnerability, attacker would get complete control of the target account. Thus it was possible to create an authorization token belonging to a stranger from Account Kit, and then send it to Tinder's app to log in as that person.

App developers should take a long, hard look at how they use Facebook's Account Kit for identifying users - after a flaw in the system, and Tinder's use of the toolkit, left shag-seekers open to account hijacking. First is the API of Tinder and the other is through Facebook's Account Kit system which safeguards user's logins.

Anand Prakash from Appsecure explained how the attack works on Tinder, "The user clicks on Login with Phone Number on tinder.com and then they are redirected to Accountkit.com for login".

Tinder accounts could be vulnerable to risks from hackers thanks to just one mobile number, according to revelations made by cyber security company AppSecure. But there is no need to worry because the good news is that after being alerted by Appsecure, Tinder has fixed the issue.

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According to AppSecure, the account takeover vulnerability in Tinder ensures that an attacker can gain access to the dating app account with any phone number, which is used to login. Conveniently enough, Account Kit also had a bug in which an attacker could have gained access to any user's Account Kit simply by using their phone number. Supplying a phone number as a "new_phone_number" parameter in an API call over HTTP skipped the verification code check, and the kit returned a valid "aks" authorization token.

Have you fallen victim to a social media hack?

Appsecure said the vulnerabilities were quickly resolved with Facebook paying a $5,000 bounty and Tinder paying a $1,250 reward.


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