Therefore I reverse engineered two apps that are dating.

Therefore I reverse engineered two apps that are dating.

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

Wen this article I reveal several of my findings throughout the reverse engineering regarding the apps Coffee Meets Bagel and also the League. I’ve identified a few critical weaknesses through the research, every one of which have now been reported into the vendors that are affected.


In these unprecedented times, increasing numbers of people are escaping to the electronic globe to deal with social distancing. Of these right times cyber-security is more crucial than ever before. From my experience that is limited few startups are mindful of security recommendations. The businesses accountable for a big variety of dating apps are not any exclusion. We started this small research study to see how secure the dating apps that are latest are.

Accountable disclosure

All severity that is high disclosed in this article have already been reported into the vendors. Because of the time of publishing, corresponding patches have already been released, and I have actually individually confirmed that the repairs have been in destination.

I am going to maybe not offer details to their proprietary APIs unless appropriate.

The candidate apps

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

Coffee Suits Bagel

Coffee satisfies Bagel or CMB for brief, established in 2012, is well known for showing users a limited amount of matches each day. They are hacked as soon as in 2019, with 6 million records taken. Leaked information included a name, current email address, age, registration date, and sex. CMB happens to be popularity that is gaining the past few years, and makes a great prospect because of this task.

The League

The tagline when it comes to League software is intelligently” that is“date. Launched a while in 2015, it really is an app that is members-only with acceptance and matches centered on LinkedIn and Twitter pages. The application is much more costly and selective than its options, it is protection on par aided by the cost?

Testing methodologies

I personally use a mix of fixed analysis and powerful analysis for reverse engineering. For fixed analysis we decompile the APK, mostly utilizing apktool and jadx. For powerful analysis i take advantage of an MITM system proxy with SSL proxy capabilities.

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

Findings on CMB

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

See whom disliked you on CMB using this one simple trick

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

There is an API that offered a bagel ID returns the object that is bagel. The bagel ID is shown into the batch of daily bagels. Therefore if you wish to see if some one has rejected you, you can take to the next:

This really is a safe vulnerability, however it is funny that this industry is exposed through the API it is not available through the software.

Geolocation information leak, not actually

CMB shows other users’ longitude and latitude up to 2 decimal places, that will be around 1 square mile. Luckily this info is perhaps perhaps maybe not real-time, which is just updated whenever a person chooses to upgrade their location. (we imagine this must be used by the application for matchmaking purposes. I’ve maybe not confirmed this theory.)

But, this field is thought by me could possibly be concealed through the reaction.

Findings on The League

Client-side produced verification tokens

The League does one thing pretty unusual within their login flow:

The UUID that becomes the bearer is totally client-side generated. Even even even Worse, the host will not confirm that the bearer value is a real legitimate UUID. It might cause collisions as well as other dilemmas.

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

Contact number drip through an unauthenticated API

Into the League there is certainly an unauthenticated api that accepts a phone quantity as question parameter. The API leakages information in HTTP reaction code. If the contact number is registered, it comes back 200 okay , nevertheless when the number isn’t registered, it comes back 418 we’m a teapot . It might be mistreated in a ways that are few e.g. mapping all the true figures under a place rule to see who’s in the League and that is perhaps perhaps perhaps not. Or it may result in embarrassment that is potential your coworker finds out you’re on the application.

It has because been fixed if the bug ended up being reported to your merchant. Now the API merely returns 200 for several needs.

LinkedIn task details

The League integrates with LinkedIn to exhibit a user’s manager and task name on the profile. Often it goes a bit overboard collecting information. The profile API comes back detailed work position information scraped from LinkedIn, such as the begin year, end year, etc.

As the application does ask individual authorization to see LinkedIn profile, an individual most likely will not expect the position that is detailed become incorporated into their profile for everybody else to look at. I actually do maybe maybe not genuinely believe that type or login types of info is needed for the application to operate, and it will oftimes be excluded from profile information.

Previous Post
Newer Post

Leave A Comment