Location Sharing App Security Flaw Exposes 35M Users

A serious security flaw has recently been identified in the widely used location sharing application, impacting over 35 million users on both iOS and Android platforms. The vulnerability was uncovered by security expert Eric Daigle, who identified multiple weaknesses in the app's data management and group functionality that could allow unauthorized access to sensitive personal and location information.

Daigle’s investigation began by installing the app on a test device and analyzing its network activity through specialized tools. He observed that creating new accounts required no CAPTCHA or email verification, enabling the easy generation of numerous fake profiles—highlighting a fundamental security oversight. Further probing revealed an insecure data endpoint: when attempting to retrieve profile images stored on Amazon Web Services, Daigle found that, despite receiving a forbidden response initially, the images were ultimately accessible publicly due to missing access controls.

The core feature of the app, which involves forming groups to share real-time location data, was also vulnerable. Daigle demonstrated that an attacker could join existing groups and view other members’ locations without invitation, by exploiting predictable user ID sequences and a hardcoded authorization key embedded in the app’s code. This bypassed the intended security measures, allowing unauthorized access.

Additional flaws stemmed from inadequate authentication protocols. By manipulating API request headers and using arbitrary user IDs, Daigle was able to create and join groups freely, further compromising user privacy. Despite attempts to alert the app developers directly, no immediate response was received. Eventually, through collaboration with a journalist from TechCrunch, the security issues were verified and communicated to the developers.

A patch addressing these vulnerabilities was successfully implemented by April 19, 2024. This incident underscores the critical need for secure authentication practices and cautious handling of embedded credentials within mobile applications. Users are strongly encouraged to keep their apps up to date and remain cautious about the permissions they grant, especially in apps that handle sensitive location data.

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