A popular Google Messages replacement exposed private user data

A popular Google Messages replacement exposed private user data”

Go SMS Pro messaging app has more than 100 million users.

Security researchers at the firm TrustWave found that the app was exposing user data carelessly by uploading files shared on the app to a public URL.

Apart from leaking messages, it also leaked private photos, financial transaction details, private messages, all part of SMS, on the web.

An intelligent hacker or cybercriminal could guess an attachment URL (in the hexadecimal sequence) and see its contents with enough time.

To understand the vulnerability, readers must note that this app allows users to share files with anyone regardless whether or not the recipient has the app or not.

The private media files sent by users to contacts who don't have the app installed on their devices can be accessed from the app's servers using a shortened URL which redirects to a content delivery network (CDN) server GO SMS Pro uses to store all shared files. This link lets the recipient view the media file using a Web browser.

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Trustwave shared its findings with TechCrunch this week. They were able to view private images like a screenshot with bank information, an order confirmation with a home address and an arrest record. Worse, the app maker has done nothing to fix the bug.

Trustwave disclosed the vulnerability 90 days after contacting the app's developer on August 18 and after receiving no reply to three other emails sent in September, October, and earlier this week, in November. "However, a random picture of a sunset will likely not be easily traced back to a person", said Karl Sigler, senior security research manager at SpiderLabs. An attacker can leverage this technique to generate a list of URLs and steal user data without their knowledge. Even after informing about the flaw, they had done nothing to fix the bug.

It's likely that the flaw impacts the iOS version of GO SMS Pro as well, but until there's a fix in place, it is highly recommended to avoid sending media files using the affected messenger app.

You might think that WhatsApp is pretty much the only messaging option that anyone ever ends up using, but the fact of the matter is that there are a lot of other options out there.

This hasn't been the only data leak which became a security nightmare for millions of people this year. However, an email sent to one address bounced back with a message that the inbox was full, while another email was received but wasn't responded and a follow-up was not even opened.

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