The way I compromised Tinder profile utilizing Facebook’s membership system and got $6,250 in bounties

The way I compromised Tinder profile utilizing Facebook’s membership system and got $6,250 in bounties

This could be are released using license of Twitter under the liable disclosure approach.

The vulnerabilities mentioned found in this blog post are plugged easily by your technology teams of myspace and Tinder.

This article is all about an account takeover susceptability I discovered in Tinder’s tool. By exploiting this, an attacker may have gathered entry to the victim’s Tinder membership, who must have made use of their telephone number to sign in.

This could currently abused through a vulnerability in Facebook’s levels Kit, which myspace has recently resolved.

Both Tinder’s cyberspace and cellular apps allow customers to make use of her cell phone amounts to log into needed. Which sign on service are given by Account gear (myspace).

Sign on Provider Provided With Facebook’s Accountkit on Tinder

The individual clicks on Login with telephone number on immediately after which they might be redirected to for connect to the internet. If your verification is successful consequently accounts gear goes the gain access to token to Tinder for go online.

Surprisingly, the Tinder API was not inspecting the client identification regarding token provided by Account system.

This allowed the attacker militarycupid profile examples to work with all other app’s accessibility token furnished by accounts set to consider in the true Tinder profile of various other individuals.

Susceptability Definition

Account package are a product of Facebook that helps men and women quickly sign up for and log on to some subscribed apps by using just the company’s names and numbers or email addresses without the need for a password. It’s effective, user-friendly, and gives the consumer an option about they wish to join applications.

Tinder are a location-based mobile app for searching and fulfilling new people. It permits customers to love or hate more customers, after which go on to a chat if each party swiped best.

There was a susceptability in membership Kit by which an assailant may have gained accessibility any user’s Account Kit accounts simply by utilizing their number. When in, the assailant could have become ahold on the user’s accounts set access token contained in their particular cookies (aks).

Afterward, the attacker might use the entry token (aks) to sign in the user’s Tinder membership utilizing a susceptible API.

Just how our take advantage of functioned step by step

Step # 1

1st the assailant would sign in victim’s accounts Kit levels by going into the victim’s contact number in “new_phone_number” in API consult revealed below.

Please note that Account equipment had not been validating the mapping of this phone numbers their onetime password. The attacker could enter anyone’s phone number following merely log into the victim’s Account gear profile.

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

The prone Profile Kit API:

Stage no. 2

Today the assailant simply replays the subsequent consult using the duplicated availability keepsake “aks” of victim into the Tinder API below.

They’ll be recorded into victim’s Tinder account. The opponent would next fundamentally have complete control over the victim’s accounts. They might browse individual chats, full sensitive information, and swipe some other user’s profiles put or ideal, on top of other things.

Prone Tinder API:

Movie Evidence Of Strategy


The weaknesses had been addressed by Tinder and fb immediately. Zynga honored me with US $5,000, and Tinder grant me personally with $1,250.

I’m the president of AppSecure, a skilled cyber safeguards corporation with a great deal of expertise obtained and meticulous knowledge. We’ve been in this article to safeguard your small business and vital info from on the web and off-line hazards or weaknesses.

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