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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

In this post I reveal a few of my findings through the engineering that is reverse of apps Coffee Meets Bagel additionally the League. I have identified a few critical weaknesses throughout the research, all of these have already been reported to your affected vendors.


Within these unprecedented times, increasing numbers of people are escaping in to the world that is digital deal with social distancing. Over these right times cyber-security is more essential than ever before. From my experience that is limited few startups are mindful of security guidelines. The businesses in charge of a range that is large of apps are not any exclusion. We began this small research study to see exactly how secure the dating apps that are latest are.

Accountable disclosure

All high severity weaknesses disclosed in this article have already been reported towards the vendors. By the time of publishing, matching patches have already been released, and I also have actually individually confirmed that the repairs come in destination.

I am going to perhaps not offer details in their APIs that is proprietary unless.

The prospect apps

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

Coffee Meets Bagel

Coffee matches Bagel or CMB for brief, established in 2012, is known for showing users a restricted quantity of matches each day. They’ve been hacked as soon as in 2019, with 6 million records taken. Leaked information included a name that is full current email address, asian wife age, enrollment date, and sex. CMB is gaining interest in the last few years, and makes a beneficial prospect with this project.

The League

The tagline when it comes to League software is intelligently” that is“date. Launched time in 2015, it really is a members-only software, with acceptance and fits predicated on LinkedIn and Twitter pages. The application is much more high priced and selective than its options, it is protection on par with all the cost?

Testing methodologies

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

A lot of the screening is performed in a very rooted Android emulator running Android os 8 Oreo. Tests that want more capabilities are done on a genuine Android os unit lineage that is running 16 (predicated on Android os Pie), rooted with Magisk.

Findings on CMB

Both apps have large amount of trackers and telemetry, but i assume this is certainly just hawaii regarding the industry. CMB has more trackers compared to the League though.

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

The API features a pair_action industry in almost every bagel item and it is an enum because of the after values:

There is certainly an API that offered a bagel ID returns the bagel object. The bagel ID is shown when you look at the batch of day-to-day bagels. Therefore should you want to see if some body has refused you, you can take to listed here:

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

Geolocation information drip, not actually

CMB shows other users’ longitude and latitude up to 2 decimal places, that is around 1 square mile. Luckily this info is maybe maybe perhaps not real-time, and it’s also just updated whenever a user chooses to upgrade their location. (we imagine this is employed because of the software for matchmaking purposes. We have perhaps not confirmed this theory.)

Nonetheless, this field is thought by me might be concealed through the reaction.

Findings on The League

Client-side produced authentication tokens

The League does something pretty unusual inside their login flow:

The UUID that becomes the bearer is totally client-side generated. Even even even Worse, the host will not validate that the bearer value is a real UUID that is valid. It may cause collisions as well as other issues.

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

Telephone number leak 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 telephone number is registered, it comes back 200 okay , nevertheless when the true quantity just isn’t registered, it comes back 418 we’m a teapot . Maybe it’s mistreated in a ways that are few e.g. mapping all the true figures under a place rule to see that is regarding the League and that is maybe perhaps perhaps not. Or it could induce possible embarrassment whenever your coworker finds out you’re on the application.

It has because been fixed as soon as the bug had been reported into the merchant. Now the API merely returns 200 for several demands.

LinkedIn task details

The League integrates with LinkedIn to exhibit a user’s manager and work name on the profile. Often it goes a bit overboard collecting information. The profile API comes back job that is detailed information scraped from LinkedIn, such as the begin 12 months, end 12 months, etc.

Whilst the application does ask individual authorization to learn LinkedIn profile, an individual probably doesn’t expect the position that is detailed become contained in their profile for everyone to see. I actually do perhaps maybe perhaps not genuinely believe that types of info is essential for the app to work, and it will oftimes be excluded from profile information.

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