How I hacked Tinder accounts using Facebook’s accounts package and attained $6,250 in bounties

How I hacked Tinder accounts using Facebook’s accounts package and attained $6,250 in bounties

This is certainly are posted utilizing the approval of fb in the accountable disclosure coverage.

The weaknesses pointed out through this article are hooked fast by design groups of myspace and Tinder.

This posting is all about a free account takeover vulnerability i came across in Tinder’s application. By exploiting this, an attacker may have gathered entry to the victim’s Tinder membership, that should have used their number to log in.

This can being exploited through a susceptability in Facebook’s Account package, which fb has addressed.

Both Tinder’s internet and cell phone apps enable consumers to utilize his or her mobile phone rates to log into this service membership. So this go solution happens to be given by levels gear (Twitter).

Go Tool Powered by Facebook’s Accountkit on Tinder

Anyone clicks about sign on with Phone Number on right after which they have been redirected to for go online. In the event the authentication works after that accounts set moves the connection token to Tinder for go browsing.

Curiously, the Tinder API was not checking out your client ID about token furnished by Account gear.

This enabled the attacker to utilize every other app’s accessibility token provided by profile system taking during the genuine Tinder profile of other users.

Weakness Story

Account system is actually a solution of fb that allows individuals immediately register for and get on some subscribed programs simply by using simply their particular cell phone numbers or emails without resorting to a code. Its reliable, simplified, and provides the person a variety precisely how they would like to subscribe to applications.

Tinder try a location-based mobile app for researching and achieving new people. It permits owners to enjoy or dislike various other users, following proceed to a chat if both parties swiped suitable.

There was a vulnerability in accounts set through which an assailant might have acquired entry to any user’s membership gear levels by simply making use of their telephone number. Once in, the opponent perhaps have become ahold regarding the user’s levels system connection token found in the Tsdates promo codes company’s cookies (aks).

From then on, the attacker should use the entry token (aks) to sign in the user’s Tinder accounts making use of a susceptible API.

Just how the take advantage of functioned step by step

Move no. 1

Very first the assailant would log into victim’s accounts package membership by entering the victim’s contact number in “new_phone_number” when you look at the API demand shown below.

Take note that levels gear was not confirming the mapping associated with the names and numbers their one-time password. The assailant could come into anyone’s contact number immediately after which basically sign in the victim’s levels set profile.

Then the attacker could copy the victim’s “aks” access token of Account Kit app from cookies.

The susceptible Levels Set API:

Run # 2

At this point the assailant merely replays below request using the copied entry token “aks” of prey to the Tinder API below.

They are recorded inside victim’s Tinder accounts. The opponent would next essentially has complete power over the victim’s accounts. They could see personal shows, full personal information, and swipe additional user’s kinds left or right, among other things.

Weak Tinder API:

Video Proof Principle


Both the weaknesses had been solved by Tinder and facebook or twitter fast. Zynga honored myself with our team $5,000, and Tinder honored myself with $1,250.

I’m the creator of AppSecure, a skilled cyber safeguards team with numerous years of talent acquired and precise competence. Our company is below to shield your small business and crucial records from on the web not online risks or weaknesses.

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