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Therefore I reverse engineered two dating apps.

Posted on July 20, 2022

Therefore I reverse engineered two dating apps.

Video and picture drip through misconfigured S3 buckets

Typically for images or any other asserts, some form of Access Control List (ACL) could be set up. A common way of implementing ACL would be for assets such as profile pictures

The important thing would act as a “password” to get into the file, in addition to password would simply be provided users who require usage of the image. When it comes to an app that is dating it’s going to be whoever the profile is presented to.

I’ve identified several misconfigured buckets that are s3 The League throughout the research. All photos and videos are inadvertently made general general general public, with metadata such as which user uploaded them when. Usually the application would obtain the pictures through Cloudfront, a CDN on top of this buckets that are s3. Unfortunately the underlying S3 buckets are severely misconfigured.

Side note: as much as i can inform, the profile UUID is arbitrarily produced server-side as soon as the profile is established. To make certain that part is not likely to be very easy to imagine. The filename is managed by the customer; the host takes any filename. In your client app it’s hardcoded to upload.jpg .

Owner has since disabled general public ListObjects. Nevertheless, we nevertheless think there must be some randomness into the key. A timestamp cannot act as key.

internet protocol address doxing through website link previews

Link preview is something that is difficult to get appropriate in a complete large amount of messaging apps. You will find typically three techniques for website link previews:

The League utilizes link that is recipient-side. Whenever a note includes a hyperlink to a outside image, the hyperlink is fetched on user’s unit as soon as the message is seen. This could efficiently enable a harmful transmitter to submit an external image URL pointing to an attacker managed host, obtaining recipient’s internet protocol address once the message is exposed.

A far better solution could be merely to connect the image into the message if it is delivered (sender-side preview), or have actually the server fetch the image and place it within the message (server-side preview). Server-side previews enables anti-abuse scanning that is additional. It might be an improved choice, yet still maybe perhaps perhaps not bulletproof.

Zero-click session hijacking through talk

The software will attach the authorization sometimes header to demands that do not need verification, such as for example Cloudfront GET demands. It will happily give fully out the bearer token in requests to outside domain names in some instances.

Among those situations could be the image that is external in chat messages. We know already the software utilizes link that is recipient-side, therefore the demand towards the outside resource is performed in recipient’s context. The authorization header is roofed within the GET demand into the image that is external. Therefore the bearer token gets leaked to your domain that is external. Whenever a sender that is malicious a picture website link pointing to an assailant controlled host, not merely do they get recipient’s internet protocol address, nonetheless they additionally obtain victim’s session token. It is a critical vulnerability as it allows session hijacking.

Observe that unlike phishing, this assault will not need the target to go through the website link. As soon as the message containing the image website link is seen, the application immediately leaks the session token into the attacker.

This hookupwebsites.org/asian-hookup-apps indicates to be always a bug linked to the reuse of a worldwide OkHttp customer object. It might be most readily useful if the designers ensure the software only attaches authorization bearer header in demands towards the League API.


I didn’t find any specially interesting weaknesses in CMB, but that will not suggest CMB is more protected compared to League. (See Limitations and future research). I did so find a security that is few within the League, none of that have been especially tough to find out or exploit. I suppose it is the mistakes that are common make over repeatedly. OWASP top anybody?

As customers we must be aware with which companies we trust with your information.

Vendor’s reaction

I did so be given a response that is prompt The League after giving them a message alerting them associated with findings. The S3 bucket setup had been swiftly fixed. One other weaknesses had been patched or at the least mitigated inside a couple weeks.

I believe startups could offer bug bounties certainly. It really is a good motion, and much more significantly, platforms like HackerOne offer scientists a appropriate road to the disclosure of weaknesses. Unfortuitously neither of this two apps into the post has program that is such.

Restrictions and research that is future

This scientific studies are perhaps maybe not comprehensive, and may never be viewed as a security review. All the tests on this page were done in the system IO degree, and almost no from the customer it self. Notably, we did not test for remote rule execution or buffer type that is overflow. In future research, we’re able to look more in to the protection regarding the customer applications.

This might be finished with powerful analysis, utilizing techniques such as for example:

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