The way I compromised Tinder profile utilizing Facebook’s Account equipment and gained $6,250 in bounties

The way I compromised Tinder profile utilizing Facebook’s Account equipment and gained $6,250 in bounties

It is getting circulated because of the approval of Twitter according to the liable disclosure policy.

The weaknesses pointed out within this blog post are plugged immediately through the engineering groups of facebook or myspace and Tinder.

This document is about a merchant account takeover vulnerability I realized in Tinder’s application. By exploiting this, an attacker may have obtained accessibility the victim’s Tinder accounts, just who needs used the company’s phone number to visit.

This could were used through a vulnerability in Facebook’s accounts Kit, which Facebook has dealt with.

Both Tinder’s internet and cell phone methods let owners to utilize their unique mobile phone data to log into localhookups sign in needed. And this also sign on program happens to be offered by levels system (fb).

Go browsing Services Provided With Facebook’s Accountkit on Tinder

You clicks over go online with contact number on immediately after which simply rerouted to for go browsing. When the authentication works after that levels Kit passes the connection token to Tinder for go.

Interestingly, the Tinder API was not inspecting the consumer identification document on token offered by Account package.

This enabled the assailant to make use of almost every other app’s gain access to token supplied by accounts equipment to take across the actual Tinder accounts of more users.

Weakness Classification

Membership package try a product or service of myspace that allows customers immediately use and get on some subscribed software using merely her phone numbers or email address without resorting to a password. It is reliable, user friendly, and offers the individual a decision about they wish to sign up for applications.

Tinder try a location-based mobile application for researching and fulfilling other people. It provides individuals to enjoy or dislike other people, and then proceed to a chat if both parties swiped correct.

There were a susceptability in profile set whereby an opponent perhaps have achieved entry to any user’s levels equipment account by simply utilizing their telephone number. Once in, the opponent may have gotten ahold associated with user’s membership set availability token present in their particular snacks (aks).

Afterwards, the attacker might use the accessibility token (aks) to sign in the user’s Tinder levels using a weak API.

Just how my exploit proved helpful step by step

Step no. 1

Very first the opponent would sign in victim’s levels Kit profile by going into the victim’s number in “new_phone_number” for the API inquire indicated below.

Please note that membership package wasn’t validating the mapping with the cell phone numbers making use of their single code. The attacker could enter anyone’s phone number and then merely log into the victim’s profile system levels.

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

The weak Profile Gear API:

Action #2

Now the assailant basically replays listed here need utilising the copied access keepsake “aks” of prey into Tinder API below.

They will be recorded into the victim’s Tinder account. The opponent would then generally have actually complete control of the victim’s levels. They might read personal shows, full private information, and swipe some other user’s profiles leftover or correct, among other things.

Vulnerable Tinder API:

Video Proof Principle


The weaknesses happened to be solved by Tinder and facebook or myspace swiftly. Zynga compensated me personally with our team $5,000, and Tinder given me personally with $1,250.

I’m the founder of AppSecure, a skilled cyber safeguards vendor with a great deal of skills got and meticulous competence. We are right here to protect your online business and important facts from on the web and outside of the internet hazards or weaknesses.

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