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Therefore I reverse engineered two dating apps.

Therefore I reverse engineered two dating apps.

And I also got a session that is zero-click as well as other enjoyable weaknesses

Wen this article I reveal a few of my findings through the engineering that is reverse of apps Coffee Meets Bagel therefore the League. I’ve identified a few critical vulnerabilities through the research, all of these have now been reported into the vendors that are affected.


In these unprecedented times, a lot more people are escaping in to the electronic globe to deal with social distancing. Over these right times cyber-security is more crucial than ever before. From my limited experience, extremely few startups are mindful of security recommendations. The businesses in charge of a big variety of dating apps are no exclusion. We began this small scientific study to see just just how secure the latest relationship apps are.

Accountable disclosure

All high severity weaknesses disclosed in this article have now been reported to your vendors. Because of the time of publishing, matching patches were released, and I also have actually separately confirmed that the repairs come in destination.

I’ll maybe maybe not offer details to their APIs that is proprietary unless.

The prospect apps

We picked two popular dating apps available on iOS and Android os.

Coffee Suits Bagel

Coffee matches Bagel or CMB for brief, established in 2012, is famous for showing users a restricted quantity of matches each and every day. They’ve been hacked when in 2019, with 6 million records taken. Leaked information included a complete name, current email address, age, registration date, and sex. CMB happens to be popularity that is gaining the last few years, and makes a great prospect because of this task.

The League

The tagline for The League software is intelligently” that is“date. Launched time in 2015, it’s an app that is members-only with acceptance and fits according to LinkedIn and Twitter pages. The software is much more costly and selective than its options, it is protection on par aided by the cost?

Testing methodologies

I personally use a variety of fixed analysis and analysis that is dynamic reverse engineering. For static analysis we decompile the APK, mostly utilizing apktool and jadx. For powerful analysis an MITM is used by me system proxy with SSL proxy capabilities.

Most of the assessment is performed in a very Android os that is rooted emulator Android os 8 Oreo. Tests that need more capabilities are done on a genuine Android os unit lineage that is running 16 (according to Android os Pie), rooted with Magisk.

Findings on CMB

Both apps have great deal of trackers and telemetry, but i suppose that is simply the state for the industry. CMB has more trackers compared to the League though.

See whom disliked you on CMB with this specific one simple trick

The API carries a pair_action field in almost every bagel item and it’s also an enum with all the values that are following

There is certainly an API that offered a bagel ID returns the object that is bagel. The bagel ID is shown within the batch of day-to-day bagels. Therefore you, you could try the following if you want to see if someone has rejected:

This really is a safe vulnerability, however it is funny that this industry is exposed through the API it is unavailable through the application.

Geolocation information drip, yet not actually

CMB shows other users’ longitude and latitude up to 2 decimal places, which will be around 1 square mile. Luckily this info is perhaps perhaps not real-time, which is just updated whenever a person chooses to upgrade their location. (we imagine this can be used because of the software for matchmaking purposes. We have perhaps perhaps perhaps not confirmed this theory.)

Nevertheless, i really do think this industry might be concealed through the reaction.

Findings on The League

Client-side created verification tokens

The League does something pretty unusual inside their login flow:

The UUID that becomes the bearer is completely client-side generated. even Worse, the host does not confirm that the bearer value is a real legitimate UUID. It might cause collisions along with other dilemmas.

I would recommend changing the login model so that the bearer token is created server-side and delivered to the client when the host gets the proper OTP through the customer.

Telephone number drip through an unauthenticated API

When you look at the League there is an unauthenticated api that accepts a phone quantity as question parameter. The API leakages information in HTTP reaction code. If the telephone number is registered, it comes back 200 OK , but once the quantity just isn’t registered, it comes back 418 we’m a teapot . It can be mistreated in a ways that are few e.g. mapping all the true figures under a location rule to see that is regarding the League and that is maybe perhaps not. Or it may induce prospective embarrassment whenever your coworker finds out you’re on the software.

It has because been fixed once the bug had been reported towards the merchant. Now the API merely returns 200 for many demands.

LinkedIn task details

The League integrates with LinkedIn to demonstrate a user’s boss and work name on the profile. Sometimes it goes a bit overboard collecting information. The profile API comes back job that is detailed information scraped from LinkedIn, just like the begin 12 months, end year, etc.

Whilst the software does ask individual authorization to learn LinkedIn profile, an individual most likely will not expect the step-by-step place information become incorporated into their profile for everybody else to see. I really do perhaps not genuinely believe that type or form of info is essential for the application to operate, and it may oftimes be excluded from profile information.

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